CN108602099A - Utilize the method for Crown control cast strip - Google Patents

Abstract

The present invention provides the methods and apparatus for continuously casting strip by controlling roll crown.Include at least two expansion loops for the equipment by controlling roll crown continuously to cast strip, at least two expansion loops are located in cylindrical tube and adjacent with cylindrical tube, and are spaced in the 450mm for the marginal portion of Cast Strip being formed in during casting manipulations in the opposite end portions of casting roll.Alternatively or additionally, which includes at least one expansion loop, the position of the center portion for the Cast Strip which forms in cylindrical tube on corresponding to casting roll during casting manipulations.The isolation coating of each expansion loop at least one heating element and thereon, and be adapted for increasing on radial dimension so that the thickness profile of the roll crown and Cast Strip of the casting surface for changing casting roll is expanded in cylindrical tube during casting.

Description

A Method of Utilizing Convexity Controlling Cast Metal Strip

This application is an international application of US Application No. 14/946,872 filed November 20, 2015.

technical field

The invention relates to the casting of metal strip by continuous casting in a twin roll caster.

Background technique

In a twin roll caster, molten metal is introduced between a pair of counter-rotating horizontal casting rolls that are cooled so that the metal shells solidify on the surfaces of the moving casting rolls and are brought together at the nip preceding the horizontal rolls , to produce a solidified strip product that is delivered downward from the nip between the casting rolls. The term "nip" is used herein to refer to the general area where casting rolls are closest together. Molten metal may be passed from a ladle into a smaller vessel or series of smaller vessels from which it flows through metal delivery nozzles and nozzles located above the nip forming a casting pool of molten metal The casting pool is supported on the casting surfaces of the casting rolls immediately above the nip and extending along the length of the nip. The casting pool is usually bounded between side plates or shroud plates held in sliding engagement with the end surfaces of the casting rolls, thereby limiting the two ends of the casting pool against outflow.

Twin roll casters are capable of continuously producing cast strip from molten steel passing through a sequence of ladles positioned on a turret. Molten metal is poured from each ladle, into a tundish, and then into a movable tundish before flowing through metal delivery nozzles into the casting pool. The tundish allows the exchange of an empty ladle with a full ladle on the turret without interrupting the casting strip manufacture.

In casting thin strip from a twin-roll caster, the casting rolls, generally made of copper or a copper alloy, usually coated with chromium or nickel, are internally cooled with cooling water during casting, allowing a high heat flux and thus strip Rapid solidification, where the casting rolls experience considerable thermal deformation from exposure to molten metal. The convexity of the casting surfaces of the casting rolls varies during the casting operation. The convexity of the casting surfaces of the casting rolls in turn determines the strip thickness profile, ie the cross-sectional shape, of the thin cast strip produced by the twin roll caster. Casting rolls with convex (ie, positive convex) casting surfaces produce cast strips with negative (ie, depressed in the center) cross-sectional shapes. Conversely, casting rolls with concave (ie, negative convexity) casting surfaces produce cast strips with positive (ie, centrally raised) cross-sectional shapes. As such, under typical casting conditions, the roll crown of the casting surfaces of the casting rolls is used to produce the desired strip thickness profile.

In strip casting, casting rolls are typically machined while cold to have an initial crown based on the projected convexity of the casting surface of the casting roll during casting. However, the difference in shape of the casting surface of the casting rolls between the cold condition and the casting condition is difficult to predict. Furthermore, the convexity of the casting surfaces of the casting rolls may vary significantly during a casting operation. The convexity of the casting surface of the casting rolls during casting may be due to changes in the temperature of the molten metal supplied to the casting pool of the caster, due to changes in the casting rotation of the casting rolls and due to changes such as slight changes in the composition of the molten steel Other casting conditions vary.

Previous proposals for roll crown control have relied on mechanical means to physically deform the roll; for example, by movement of deformation pistons or other elements within the roll or by applying bending forces to the roll's support shaft. However, these previous proposals for roll crown control have limitations. For example, Japanese Patent No. 2544459 (herein, "JP'459") describes casting rolls with internal "water-cooled roll heating members embedded in both end The deformation experienced by each roll end. See, JP '459, paragraph: "Components employed for problem solving". The casting rolls are solid metal rolls with internal cooling passages which require water heating members at the ends of the casting rolls. U.S. Patent No. 5,560,421 (herein, the "'421 patent") discusses the limitations of the casting machine disclosed in JP '459, which states that "the heat capacity of each drum O1 to be heated is large, The deformation responsivity of the shape of the outer surface of the cylinder to be controlled is low, and it would be difficult or impossible even to control the workpiece". '421 patent, column 1, ll.64 - column 2, ll.1. The '421 patent goes on to explain that "it will not be possible to properly control the shape of workpieces to be continuously cast". Ibid., column 2, ll.6-7. The '421 patent proposes a solution in which the solid casting roll has end cuts with a large outer annular element (to the solid roll) heated by water. These ring elements are used to change the profile of the casting rolls. '421 patent, column 2, ll.37-42.

However, large solid casting rolls such as those proposed by the JP '459 and or '421 patents are expensive to manufacture, have relatively short service lives (due to the cyclic heat flux experienced during twin roll casting of larger cylindrical masses) effects of thermal fatigue) and are less responsive due to their large thermal mass.

It has also been proposed to position the expansion ring directly on a cylindrical tube (e.g., 80 mm thick copper and copper alloys, optionally with a coating of chromium or chromium alloys thereon, and with multiple longitudinal channels extending through the tube. water flow path) to form casting rolls. This proposal was tried and failed. Heat supplied to the expansion ring is transferred into the cylindrical tube so that the ring does not respond effectively to the heat to expand the cylindrical tube to commercially control the shape of the crown of the casting surface of the casting rolls. Accordingly, there remains a need for a reliable and efficient way of directly and closely controlling the shape of the crown of the casting surface of the casting rolls during casting and thus the cross-sectional thickness profile of the thin cast strip produced by a twin roll caster.

Contents of the invention

Disclosed herein is the control of casting roll crown and thus the cross-sectional strip thickness profile by controlling the crown of the casting surface of the casting roll by an expansion ring positioned within and adjacent to the cylindrical tube forming the casting roll. reliable and effective method. Disclosed is a method of continuously casting thin strip by controlling roll crown, comprising the steps of:

a. Assemble a casting machine having a pair of counter-rotating casting rolls with a nip between them capable of delivering casting strip downward from the nip, each having a cylindrical Casting surface formed by tube, cylindrical tube having a thickness not greater than 80 mm of a material selected from the group consisting of copper and copper alloys, optionally having a metal or metal alloy coated thereon, and having a shape extending through the cylindrical Multiple longitudinal water flow paths of the pipe;

b. Position at least two expansion rings within and adjacent to the cylindrical tube and within 450 mm (preferably within 200 mm) of the edge portion of the casting strip formed on the opposite end portion of the casting roll during the casting operation inner) inner space, each expansion ring having at least one heating element and an insulating coating thereon and adapted to increase in radial dimension so that the cylindrical tube changes the roll crown of the casting surface of the casting rolls during casting and the thickness profile of the cast strip;

c. Assembling a metal delivery system capable of forming a casting pool supported on the casting surfaces of the casting rolls above the nip with side closure plates adjacent the ends of the nip to define the casting pool; as well as

d. controlling the radial dimension of the expansion ring in response to at least one of digital or analog signals received from at least one sensor to control roll crown of the casting surfaces of the casting rolls during the casting operation.

The amount of power applied to the expansion loop may be varied based on feedback from at least one sensor or sensors capable of sensing at least one of the following properties:

- temperature of one or more expansion rings,

- the thickness profile downstream of the casting,

- the local thickness of the strip at a defined point close to the edge of the strip,

- casting roll surface crown during casting operations, and

- radial roll expansion at defined points close to the strip edge;

And a digital or analog (typically electrical) signal indicative of at least one of the above properties of the cast strip can be generated.

Care should be taken to make the barrier coating on each expansion ring thick enough to control or eliminate heat transfer from the expansion ring to the casting rolls. A barrier coating of at least 0.010 inches in thickness (eg, 0.025 inches) is necessary to have effective control of heat transfer from the expansion ring to the casting rolls. A barrier coating can be plasma sprayed on the expansion ring. The barrier coating can be plasma sprayed with a zirconia spray such as 8% yttria stabilized zirconia spray. It should be noted that the barrier coating can be additionally applied to the cylindrical tube, but for economy and effectiveness, the barrier coating should be applied directly to the expansion ring.

Each expansion ring may have at least one heating element, which may be made of stainless steel, nickel or a nickel alloy. One or more heating elements may be located in each expansion ring as desired. Each expansion ring may provide up to 30kW of heating input; preferably at least 3kW of heating input.

The expandable ring may also have a water passageway therethrough allowing water to flow through the ring. The water flow through the expansion ring can be adjusted to expand or contract the expansion ring in radial dimension, and thereby cause the diameter of the cylindrical tube to increase or decrease as desired to control the convexity of the casting surface of the casting rolls during operation. degree shape.

Additionally, the method of continuously casting thin strip by controlling roll crown may further include varying the radial dimension of the expandable ring in response to at least one of digital or analog signals received from at least one sensor and controlling the The step of controlling the casting roll drive to vary the rotational speed of the casting rolls when the casting surface of the casting rolls is crowned.

In addition, the method of continuously casting thin strip by controlling the roll crown may also include positioning at least one expansion ring (for example, up to 15 expansion rings) corresponding to the center portion of the cast strip formed on the casting roll during casting. step, each expansion ring has at least one heating element and an insulating coating thereon, and is adapted to increase and decrease in radial dimension such that the cylindrical tube expands and contracts during casting to change the convexity and The thickness profile of the cast strip. In addition, the method of continuously casting thin strip by controlling roll crown may include varying the radial dimension of an expandable ring having an insulating coating spaced from an edge portion of the cast strip in response to an electrical signal received from a sensor and having a corresponding The radial dimension of one or more expansion rings of the barrier coating on the central portion of the casting belt to control the roll crown of the casting surface of the casting rolls during the casting operation, the control of the casting roll drive to change the rotational speed of the casting rolls step.

Alternatively, the method of continuously casting thin strip by controlling roll crown may include the following steps:

a. Assembling a casting machine having a pair of counter-rotating casting rolls with a nip therebetween capable of delivering casting strip downward from the nip, each casting roll having a casting surface formed by a cylindrical tube, the cylindrical shaped tube having a thickness of not more than 80 mm of a material selected from the group consisting of copper and copper alloys, optionally having a metal or metal alloy coated thereon, and having a plurality of longitudinal water flow passages extending through the cylindrical tube ;

b. positioning at least one expansion ring within the cylindrical tube corresponding to the central portion of the casting strip formed on the casting rolls during casting, the at least one expansion ring having at least one heating element and an insulating coating thereon and adapted to change in radial dimension such that the expansion of the cylindrical tube during casting changes the convexity of the casting surfaces of the casting rolls and the thickness profile of the cast strip;

c. Assembling a metal delivery system capable of forming a casting pool supported on the casting surfaces of the casting rolls above the nip with side closure plates adjacent the ends of the nip to define the casting pool;

d. controlling the radial dimension of the at least one expansion ring in response to at least one of digital or analog signals received from the at least one sensor to control roll crown of the casting surfaces of the casting rolls during the casting operation.

The amount of power applied to the one or more expansion loops may be varied based on feedback from at least one sensor or sensors capable of sensing at least one of the following properties:

- the temperature of one or more expansion rings;

- Thickness profile downstream of the cast strip;

- the local thickness of the strip at a defined point close to the center of the strip,

- casting roll surface crown during casting operations,

- the radial expansion of the casting rolls at a defined point close to the center of the casting strip;

And a digital or analog (typically electrical) signal indicative of at least one of the above properties of the cast strip can be generated.

Again, the barrier coating on each expansion ring should be thick enough to effectively control heat transfer from the expansion ring to the casting rolls. A barrier coating of at least 0.010 inches (eg, 0.025 inches) in thickness is necessary to effectively control heat transfer from the expansion ring to the casting rolls. A barrier coating can be plasma sprayed on the expansion ring. The barrier coating can be plasma sprayed with a zirconia spray such as 8% yttria stabilized zirconia spray. It should be noted that the barrier coating can be additionally applied to the cylindrical tube, but for economy and effectiveness, the barrier coating should be applied directly to the expansion ring.

Again, each expansion ring may have at least one heating element. One or more heating elements may be made of stainless steel, nickel or a nickel alloy and positioned as desired. One or more heating elements may be located anywhere around each expansion ring as desired to be effective. Each expansion ring may provide up to 30kW of heating input; preferably at least 3kW of heating input.

The expandable ring may again have water passages through it to allow water flow through the ring. The water flow can be adjusted to expand or contract the expansion ring in radial dimension, and thereby cause the diameter of the cylindrical tube to increase or decrease as desired to control the shape of the casting rolls during operation.

Additionally, the method of continuously casting thin strip by controlling roll crown may further comprise changing the radial dimension of the expandable ring in response to electrical signals received from at least one sensor and controlling the rolls of the casting surfaces of the casting rolls during the casting operation. The step of controlling the drive of the casting rolls to change the rotational speed of the casting rolls during crowning.

Furthermore, an alternative to continuously casting thin strip by controlling roll crown may also include each expansion ring having at least one heating element and barrier coating thereon and adapted to increase in radial dimension such that the cylindrical tube When expanding and changing the roll crown of the casting surfaces of the casting rolls and the thickness profile of the cast strip during casting, at least two expansion rings are positioned within and adjacent to the cylindrical tube and to the sides of the casting rolls during the casting operation. Steps where the cast strips on the opposite end portions are spaced within 450mm of the edge portion. Additionally, the method of continuously casting thin strip by controlling roll crown may include varying the radial dimension of the barrier-coated expandable ring corresponding to a central portion of the cast strip in response to electrical signals received from at least one sensor and The radial dimension of the expandable ring having the barrier coating thereon spaced from the edge portion of the casting belt and controlling the roll drive to vary the rotational speed of the casting rolls while controlling the roll crown of the casting surfaces of the casting rolls during a casting operation A step of.

In each embodiment, the expansion ring may be made of austenitic stainless steel, such as 18/8 austenitic stainless steel. Each expandable ring may have a ring size of 50 to 150 mm; preferably 70 mm. Each expansion ring may have a width of up to 200mm; preferably up to 100mm, more preferably 83.5mm.

In each embodiment of the method, the convexity of the casting surfaces of the casting rolls can be readily varied to achieve the desired thickness profile of the cast strip. Each expansion ring having a barrier coating thereon is adapted to increase or decrease in radial dimension and expand the cylindrical tube to change the convexity of the casting surfaces of the casting rolls and the thickness profile of the cast strip. The thickness of the cylindrical tube may range between 40 and 80 mm in thickness or between 60 and 80 mm in thickness.

In each embodiment of the method, at least one sensor may be positioned downstream, adapted to sense the thickness profile of the cast strip and generate an electrical signal indicative of the thickness profile of the cast strip. The sensor may be located adjacent to a pinch roll through which the belt passes after casting. Crown control of the casting surfaces of the casting rolls may be achieved by controlling the radial dimension of each expansion ring in response to electrical signals received from said sensors. Furthermore, crown control of the casting surfaces of the casting rolls may be achieved by controlling the casting roll drives to vary the rotational speed of the casting rolls while also varying the radial dimension of each expansion ring in response to electrical signals received from the sensors.

The radial dimension of each expandable ring can be controlled independently of the radial dimension of the other one or more expandable rings. The radial dimensions of the expandable rings adjacent to the belt edge on the casting surface of the casting rolls can be controlled independently of each other. Furthermore, the radial dimension of the expansion rings adjacent the belt edges on the casting surfaces of the casting rolls can be controlled independently of the one or more expansion rings corresponding to the central portion of the casting belt.

Also disclosed is an apparatus for continuously casting thin strip with controlled roll crown, comprising:

a. A pair of counter-rotating casting rolls having a nip therebetween capable of delivering casting strip downward from the nip, each having a casting surface formed by a cylindrical tube, the cylindrical tube a material selected from the group consisting of copper and copper alloys having a thickness not greater than 80 mm, optionally having a metal or metal alloy coated thereon, and having a plurality of longitudinal water flow passages extending through the cylindrical tube;

b. At least two expansion rings within and adjacent to the cylindrical tube and within 450 mm of edge portions of the casting strip formed on opposing end portions of the casting rolls during the casting operation Spaced (preferably within 200 mm), each expansion ring has at least one heating element and an insulating coating thereon and is adapted to change in radial dimension so that the expansion of the cylindrical tube during casting changes the casting surface of the casting rolls roll crown and cast strip thickness profiles; and

c. A metal delivery system positioned above the nip and capable of forming a casting pool supported on the casting surfaces of the casting rolls with side closure plates adjacent the ends of the nip to define the casting pool .

The apparatus may also include at least one sensor positioned downstream of the nip and capable of sensing a thickness profile of the cast strip and generating an electrical signal indicative of the thickness profile of the cast strip to control expansion in response to receiving the electrical signal from the sensor The radial dimension of the rings to control the roll crown of the casting surfaces of the casting rolls during the casting operation.

Additionally, the apparatus for continuously casting thin strip by controlling roll crown may include a control system capable of varying the radial dimension of the expandable ring with the barrier coating thereon in response to an electrical signal received from a sensor to When controlling the roll crown of the casting surface of the casting rolls during the casting operation, the casting roll drive is controlled and the rotational speed of the casting rolls is varied.

Furthermore, the apparatus for continuously casting thin strip with controlled roll crown may further comprise at least one expandable ring positioned within the cylindrical tube at a position corresponding to the central portion of the cast strip formed on the casting rolls during casting At least one expansion has at least one heating element and an insulating coating thereon and is adapted to increase in radial dimension such that the cylindrical tube expands and changes the convexity of the casting surfaces of the casting rolls and the casting strip during casting thickness profile. Additionally, the apparatus for continuously casting thin strip with controlled roll crown may further comprise a control system capable of varying the radial dimension of the expandable ring spaced from the edge portion of the cast strip in response to electrical signals received from at least one sensor and controlling the casting roll drive and varying the rotational speed of the casting rolls corresponding to the radial dimension of the one or more expansion rings of the central portion of the casting belt and controlling the roll crown of the casting surfaces of the casting rolls during the casting operation.

Alternatively, an apparatus for continuously casting thin strip with controlled roll crown may include:

a. A pair of counter-rotating casting rolls having a nip therebetween capable of delivering casting strip downward from the nip, each having a casting surface formed by a cylindrical tube, the cylindrical tube a material selected from the group consisting of copper and copper alloys having a thickness not greater than 80 mm, optionally having a metal or metal alloy coated thereon, and having a plurality of longitudinal water flow passages extending through the cylindrical tube;

b. at least one expansion ring within the cylindrical tube at a position corresponding to the central portion of the casting strip formed on the casting rolls during the casting operation, the at least one expansion ring having at least one heating element and thereon a barrier coating and adapted to vary in radial dimension such that expansion of the cylindrical tube during casting changes the convexity of the casting surface and the thickness profile of the cast strip; and

c. A metal delivery system positioned above the nip and capable of forming a casting pool supported on the casting surfaces of the casting rolls with side closure plates adjacent the ends of the nip to define the casting pool pool.

The apparatus may also include at least one sensor capable of sensing a thickness profile of the cast strip positioned downstream of the nip and generating an electrical signal indicative of the thickness profile of the cast strip to control expansion in response to electrical signals received from the at least one sensor The radial dimension of the rings to control the roll crown of the casting surfaces of the casting rolls during the casting operation.

Additionally, the apparatus for continuously casting thin strip by controlling roll crown may include a control system capable of varying the thickness of one or more expandable rings having a barrier coating thereon in response to electrical signals received from at least one sensor. When controlling the radial dimension of the casting roll and controlling the roll crown of the casting surface of the casting roll during the casting operation, the casting roll drive is controlled and the rotational speed of the casting roll is varied.

Additionally, the apparatus for continuously casting thin strip with controlled roll crown may further comprise at least two expandable rings within and adjacent to a cylindrical tube that is cast during the casting operation of the strip. A 450 mm inner spacing of edge portions on opposite end portions of the casting rolls was formed during this time. Each expansion ring has at least one heating element and an insulating coating thereon. The expansion ring with the barrier coating thereon is adapted to increase in radial dimension such that the expansion of the cylindrical tube during the casting operation changes the roll crown of the casting surfaces of the casting rolls and the thickness profile of the cast strip.

Additionally, the apparatus for continuously casting thin strip with controlled roll crown may further include a control system capable of varying the diameter of one or more expandable rings corresponding to the central portion of the cast strip in response to electrical signals received from sensors. The casting roll drive is controlled and the rotational speed of the casting rolls is varied while controlling the radial dimension of the expansion ring spaced from the edge portion of the casting belt to control the roll crown of the casting surface of the casting rolls during the casting operation.

In each embodiment of the device, the expansion ring may be made of austenitic stainless steel, such as 18/8 austenitic stainless steel. Each expandable ring may have a ring size between 50 and 150 mm; (eg, 70 mm). Each expansion ring may have a width of up to 200 millimeters; (eg, 83.5 millimeters).

In each embodiment of the apparatus, each expansion ring with the barrier coating thereon is adapted to increase in radial dimension such that during casting the cylindrical tube expands and changes the convexity of the casting surface of the casting rolls and the thickness profile of the cast strip. Each expansion ring has at least one heating element which may be made of stainless steel, nickel or a nickel alloy. One or more heating elements may be located around each expansion ring as desired. Each expansion ring may provide up to 30kW of heating input; preferably at least 3kW of heating input.

Again, in each embodiment of the apparatus at least one sensor is capable of sensing the thickness profile of the cast strip and capable of generating an electrical signal indicative of the thickness profile of the cast strip which may be positioned downstream. The sensors may be located adjacent to pinch rolls through which the strip passes after casting.

Crown control of the casting surfaces of the casting rolls may be achieved by controlling the radial dimension of each expansion ring in response to electrical signals received from sensors. Furthermore, casting of the casting rolls may be accomplished by controlling the casting roll drive to vary the rotational speed of the casting rolls while also varying the radial dimension of each expandable ring having a barrier coating thereon in response to electrical signals received from the sensors Surface convexity control.

The radial dimensions of the expandable rings adjacent to the belt edge formed on the casting surface of the casting rolls can be controlled independently of each other. Furthermore, the radial dimension of the expansion rings adjacent to the belt edges formed on the casting surfaces of the casting rolls can be controlled independently of the one or more expansion rings corresponding to the central portion of the casting belt.

Again, in each of the following embodiments of the method and apparatus, the barrier coating of the expandable ring is sufficiently thick that the expandable ring can be heated to be conducted to the cylindrical tube with a minimum amount of heat during the casting operation The expandable ring expands and controls the crown shape of the casting rolls as desired. A barrier coating of at least 0.010 inches (eg, 0.025 inches) in thickness is effective. Note that the barrier coating can be additionally applied to the cylindrical tube, but for economy and effectiveness, the barrier coating should be applied directly to the expansion ring during assembly of the expansion ring and casting rolls.

In each of these last embodiments of the method and apparatus, the expandable ring may also have water passages therethrough to allow water flow through the passages in the ring, and to regulate water flow through those passages. The water flow through the expansion ring can be adjusted to expand or contract the expansion ring in the radial dimension and thereby increase or decrease the diameter of the cylindrical tube as desired to control the crown shape of the casting surface of the casting rolls during operation .

Aspects of the invention will become apparent to those skilled in the art from the following detailed description, drawings, and claims.

Description of drawings

The invention is described in more detail with reference to the accompanying drawings, in which:

Figure 1 is a diagrammatic side view of a twin roll caster of the present disclosure;

Figure 2 is an enlarged partial cross-sectional view of a portion of the twin roll caster of Figure 1 including a belt inspection device for measuring the belt profile;

Figure 2A is a schematic illustration of a portion of the twin roll caster of Figure 2;

Figure 3A is a cross-sectional view longitudinally through a portion of one of the casting rolls of Figure 2 having an expansion ring corresponding to the central portion of the casting belt;

Figure 3B is a cross-sectional view longitudinally through the rest of the casting roll of Figure 3A on joining line A-A;

Figure 4 is an end view of the casting roll of Figure 3A on line 4-4, showing internal details in phantom;

Figure 5 is a cross-sectional view of the casting roll of Figure 3A on line 5-5;

Figure 6 is a cross-sectional view of the casting roll of Figure 3A on line 6-6;

Figure 7 is a cross-sectional view of the casting roll of Figure 3A on line 7-7;

Figure 8 is a partial cross-sectional view longitudinally through one of the casting rolls of Figure 2 having two expansion rings spaced from edge portions of the casting belt;

Figure 9 is a cross-sectional view longitudinally through a portion of a casting roll having an expansion ring spaced from an edge portion of the casting belt;

Figure 10 is a cross-sectional view longitudinally through a portion of one of the casting rolls of Figure 2 having two expansion rings spaced from edge portions of the casting belt and an expansion ring corresponding to a central portion of the casting belt;

Figure 11 is a cross-sectional view of an expandable ring with water passages;

Figure 12 is a graphical representation of delta RTD temperature versus time;

Figure 13 is a graphical representation of mean expansion ring temperature versus edge drop;

Figure 14 is a graphical representation of heated ring expansion versus temperature in the caster; and

Figure 15 is a side and cross-sectional view of an expandable ring with a heating element.

Detailed ways

Referring now to Figures 1, 2 and 2A, there is illustrated a twin roll casting machine comprising a main machine frame 10 standing from the factory floor and supporting a pair of movable rolls mounted in modules in a roll cassette 11. Counter-rotating casting rolls 12 . Casting rolls 12 are mounted in roll cassettes 11 for ease of handling and movement, as described below. The roll cassette 11 facilitates the rapid movement of the casting rolls 12 ready for casting from the set up position to the operative casting position as a unit in the casting machine and prepares the casting rolls 12 for removal from the casting position when the casting rolls 12 are to be replaced . There is no particular configuration of roll cassette 11 desired so long as it performs the function of facilitating movement and positioning of casting rolls 12, as described herein.

Casting apparatus for continuously casting thin steel strip includes a pair of counter-rotatable casting rolls 12 having casting surfaces 12A laterally positioned to form a nip therebetween 18. Molten metal is fed from a ladle 13 through a metal delivery system to a metal delivery nozzle 17 (core nozzle) positioned between the casting rolls 12 above a nip 18 . The molten metal thus delivered forms a casting pool 19 of molten metal above the nip 18 which is supported on the casting surfaces 12A of the casting rolls 12 . This casting pool 19 is bounded in the casting area at the ends of the casting rolls 12 by a pair of side shrouds or side shrouds 20 (shown in dotted lines in FIG. 2A ). The upper surface of the casting pool 19 (often referred to as the “meniscus” level) may be raised above the lower end of the delivery nozzle 17 such that the lower end of the delivery nozzle 17 is submerged within the casting pool 19 . The casting area includes the addition of a protective atmosphere above the casting pool 19 to inhibit oxidation of the molten metal in the casting area.

The ladle 13 is typically of conventional construction supported on a rotating tower 40 . For metal delivery, a ladle 13 is positioned above a movable tundish 14 in casting position to fill the tundish 14 with molten metal. The movable tundish 14 may be positioned on a tundish cart 66 capable of transferring the tundish 14 to the casting position from a heating station (not shown) that heats the tundish 14 to near casting temperatures. . Tundish rails, such as rails 39, may be positioned below the tundish cart 66 to enable the movable tundish 14 to be moved from the heating station to the casting position.

The movable tundish 14 may cooperate with a sliding door 25, which is actuatable by a servomechanism, to allow molten metal to flow from the tundish 14 through the sliding door 25 and then through the transition of the refractory outlet shroud 15 into the casting position piece or dispenser 16. From distributor 16 the molten metal flows to delivery nozzle 17 positioned between casting rolls 12 above nip 18 .

The side seal 20 may be made of a refractory material such as zirconia graphite, graphite alumina, boronitride, boronitride zirconia or other suitable composites. The side shrouds 20 have face surfaces capable of being in physical contact with the casting rolls 12 and the molten metal in the casting pool 19 . The side flaps 20 are mounted in side flap holders (not shown), which are movable by side flap actuators (not shown), such as hydraulic or pneumatic cylinders, servomechanisms, or other actuators, to move the The side seals 20 are brought into engagement with the ends of the casting rolls 12 . Furthermore, the side shroud actuator enables the positioning of the side shroud 20 during casting. The side seal plates 20 form end closures for molten pools of metal on the casting rolls 12 during the casting operation.

Figure 1 shows a twin roll caster for making a cast strip 21 which traverses a guide table 30 to a pinch roll table 31 comprising pinch rolls 31A. Once off the pinch roll table 31, the thin cast strip 21 may pass through a hot rolling mill 32 comprising a pair of work rolls 32A and backup rolls 32B forming a gap capable of hot rolling the cast strip 21 delivered from the casting rolls 12. , wherein the cast strip 21 is hot rolled to reduce the strip to a desired thickness, improve the strip surface, and improve strip flatness. Work roll 32A has a work surface that correlates to a desired belt profile across work roll 32A. The hot rolled cast strip 21 then proceeds to an output table 33 where it may be cooled by contact with a coolant, such as water, supplied via water nozzles 90 or other suitable means, and by convection and radiation. In any event, the hot rolled cast strip 21 may then pass through a second pinch roll table 91 to provide tension to the cast strip 21 , and then to a reel 92 . Cast strip 21 may be between about 0.3 and 2.0 millimeters in thickness prior to hot rolling.

At the beginning of a casting operation, short lengths of imperfect strips are typically produced as casting conditions stabilize. After the cast is established, the casting rolls 12 are moved apart slightly and then brought together again to break this leading end of the cast strip 21, forming a clean head end of the cast strip 21 thereafter. The imperfect material falls into a waste container 26 which is movable on waste container rails. A scrap receptacle 26 is located in a scrap receiving location below the casting machine and forms part of a containment enclosure 27, as described below. The shroud 27 is typically water cooled. At this point, a water-cooled shroud 28, normally suspended from a pivot 29 down into one side of the hood 27, swings into place to guide the clean end of the casting strip 21 onto a guide table 30, which The cast strip 21 is fed to a pinch roll table 31 . The shroud 28 is then retracted to its hanging position to allow the casting strip 21 to hang in hoops in the hood 27 under the casting rolls 12 before it travels to the guide table 30 where the casting strip 21 is engaged A series of guide rollers.

An overflow container 38 may be provided below the movable tundish 14 to receive molten material that may spill from the tundish 14 . As shown in FIG. 1 , overflow container 38 may be movable on track 39 or another rail such that overflow container 38 may be placed in a casting position below movable tundish 14 as desired. Additionally, the dispenser 16 may be provided with an optional overflow container (not shown) adjacent to the dispenser 16 .

The airtight enclosure 27 is formed of several separate wall sections which fit together at each sealed connection to form a continuous enclosure wall which allows the atmosphere inside the enclosure 27 to be controlled. Additionally, the scrap container 26 may be able to be attached to the hood 27 such that the hood 27 can support a protective atmosphere immediately below the casting rolls 12 in the casting position. Cover 27 includes an opening in a lower portion of cover 27 , lower cover portion 44 , providing an outlet for waste to travel from cover 27 into waste container 26 in a waste receiving location. The lower shroud portion 44 may extend downwardly as part of the shroud 27 with the opening positioned above the waste receptacle 26 in the waste receiving position. As used in the description and claims herein, references to "seal," "sealed," "sealed," and "tightly" referring to waste container 26, cover 27, and related features may not be intended to prevent leakage A perfect seal, but usually not a perfect seal, is adapted to allow the atmosphere within the enclosure 27 to be controlled and supported as desired with some tolerable leakage.

The rim portion 45 may surround the opening of the lower shroud portion 44 and may be movably positioned over the waste container 26, sealingly engaging and/or attachable to the waste container 26 in a waste receiving position. The rim portion 45 is movable between a sealed position in which the rim portion 45 engages the waste container 26 and a clearance position in which the rim portion 45 disengages the waste container 26 . Alternatively, the caster or waste container 26 may include a lift mechanism to raise the waste container 26 into sealing engagement with the rim portion 45 of the shroud 27 and then lower the waste container 26 into the clearance position. When sealed, the hood 27 and waste container 26 are filled with a desired gas, such as nitrogen, to reduce the amount of oxygen in the hood 27 and to provide a protective atmosphere with the casting belt 21 .

The shroud 27 may include an upper collar portion 43 that supports a protective atmosphere, the upper collar portion 43 being immediately below the casting rolls 12 in the casting position. When the casting rolls 12 are in the casting position, the upper collar portion 43 moves to the extended position, closing the space between the housing portion 53 adjacent the casting rolls 12 and the shroud 27 as shown in FIG. 2 . The upper collar portion 43 may be provided within or adjacent the shroud 27 and adjacent to the casting rolls 12, and may be moved by a number of actuators (not shown), such as servo, hydraulic, pneumatic, and Rotary actuator.

The casting rolls 12 are internally water cooled as described below so that as the casting rolls 12 counter-rotate, the shell solidifies on the casting surface 12A as the casting surface 12A moves into contact with the contact casting pool 19 with each rotation of the casting rolls 12 And pass the cast pool 19. The shells are brought close together at the nip 18 between the casting rolls 12 to produce a thin cast strip product 21 which is delivered downwards from the nip 18 . The thin cast strip product 21 is formed from the shell at the nip 18 between the casting rolls 12 and is delivered downward and moves downstream, as described above.

Referring now to FIGS. 3A-10, each casting roll 12 comprises a cylindrical tube 120 of a metal selected from the group consisting of copper and copper alloys, optionally with a metal or metal alloy (e.g., chromium or nickel) coated thereon. , to form the casting surface 12A. Each cylindrical tube 120 may be mounted between a pair of stub assemblies 121 and 122 . Stub shaft assemblies 121 and 122 have end portions 127 and 128 , respectively (shown in FIGS. 4-6 ), which fit snugly within the ends of cylindrical tube 120 to form casting roll 12 . Cylindrical tube 120 is thus supported by end portions 127 and 128 having flange portions 129 and 130 respectively to form interior cavity 163 therein and to support the assembled casting rolls between stub assemblies 121 and 122 .

The outer cylindrical surface of each cylindrical tube 120 is a roll cast surface 12A. The radial thickness of the cylindrical tube 120 may be no greater than 80 mm thick. The thickness of the tube 120 may range between 40 and 80 millimeters in thickness or between 60 and 80 millimeters in thickness.

Each cylindrical tube 120 is provided with a series of longitudinal water flow passages 126 which may be formed by drilling elongated holes through the circumferential thickness of the cylindrical tube 120 from one end to the other. The ends of the bores are then closed by end plugs 141 attached to end portions 127 and 128 of stub shaft assemblies 121 and 122 by fasteners 171 . A water flow passage 126 is formed through the thickness of the cylindrical tube 120 with end plugs 141 . The number of stub fasteners 171 and end plugs 141 can be selected as desired. End plugs 141 may be arranged to provide water passage in the stub assembly described below in single-pass cooling from one end of casting roll 12 to the other, or alternatively, to provide multi-pass cooling where, for example, connecting flow Passage 126 to provide three passes of cooling water through adjacent flow passage 126 before returning the water directly or through chamber 163 to the water supply.

Water flow passage 126 through the thickness of cylindrical tube 120 may be connected to a water supply in series with chamber 163 . The water passage 126 may be connected to the water supply such that the cooling water first passes through the cavity 163 and then through the water supply passage 126 to the return line, or first through the water supply passage 126 and then through the cavity 163 to the return line.

The cylindrical tube 120 may be provided with a circumferential step 123 at the end to form shoulders 124 with the working portion of the roll casting surface 12A of the casting roll 12 between the shoulders 124 . The shoulder 124 is arranged to engage the side shroud 20 and define the casting pool 19 during casting operations, as described above.

End portions 127 and 128, respectively, of stub assemblies 121 and 122 typically sealingly engage the ends of cylindrical tube 120 and have radially extending water passages 135 and 136 as shown in FIGS. Delivery to the water flow passage 126 extending through the cylindrical tube 120 . Radial flow passages 135 and 136 are connected (eg, in a threaded arrangement) to the ends of at least some of the water flow passages 126, depending on whether the cooling is a single-pass or multi-pass cooling system. The remaining ends of the water flow passage 126 may be closed by eg threaded end plugs 141 as described in the case of the water cooling being a multi-way system.

As shown in detail by FIG. 7 , the cylindrical tube 120 may be positioned as an annular array in the thickness of the cylindrical tube 120 with a single-pass or multi-pass array of water flow passages 126 as desired. Water flow passage 126 is connected by radial port 160 at one end of casting roll 12 to annular gallery (gallery) 140 and then to radial flow passage 135 of end portion 127 in stub assembly 121, and at one end of casting roll 12 The other end of is connected by a radial port 161 to the annular gallery 150 and in turn to the radial flow passage 136 of the end portion 128 in the stub assembly 121 . Water supplied through an annular gallery 140 or 150 at one end of the roller 12 can flow in parallel through all of the water flow passages 126 to the other end of the roller 12 in a single pass, and pass through the channel at the other end of the cylindrical tube 120. Outflow to the passage 135 or 136 and another annular corridor 150 or 140 . The directional flow can be reversed as desired by proper connection of the supply and return line(s). Alternatively or additionally, selective one of water flow paths 126 from radial paths 135 and 136 may be optionally connected or blocked to provide a multi-way arrangement, such as a three-way.

The stub assembly 122 may be longer than the stub assembly 121 . As shown in FIG. 3B , stub assembly 122 may be provided with two sets of water flow ports 133 and 134 . Water flow ports 133 and 134 are connectable with rotary water flow unions 131 and 132 by which water is delivered to and from casting rolls 12 axially through stub assembly 122 . In operation, cooling water is passed to and through water flow passage 126 in cylindrical tube 120 via radial passages 135 and 136 extending through end portions 127 and 128 of stub shaft assemblies 121 and 122 , respectively. The stub assembly 121 cooperates with the axial tube 137 to provide fluid communication between the radial passage 135 of the end portion 127 and the central cavity within the casting roll 12 . The stub assembly 122 cooperates with an axial spacer tube to separate the central water conduit 138 in fluid communication with the central cavity 163 from the annular water flow conduit 139 in fluid communication with the radial passage 136 in the end portion 122 of the stub assembly 122 . Central water conduit 138 and annular water conduit 139 can provide inflow and outflow of cooling water to and from casting rolls 12 .

In operation, incoming cooling water may be supplied through supply line 131 through port 133 to annular conduit 139, which in turn is in fluid communication with radial passage 136, gallery 150, and water flow passage 126, and then through gallery 140, radial Passage 135 , axial tube 137 , central lumen 163 , and central water conduit 138 return to outflow line 132 through water flow port 134 . Alternatively, the water flow to and from the casting rolls 12 may be in reverse direction as desired. Water flow ports 133 and 134 may be connected to water supply and return lines so that water may flow to and from water flow passage 126 in any direction as desired in cylindrical tube 120 of casting roll 12 . Depending on the direction of flow, cooling water flows through cavity 163 before or after flowing through water flow passage 126 .

Each cylindrical tube 120 may be provided with at least one expandable ring having an insulating coating thereon. As shown in FIG. 8 , the cylindrical tube 120 may be provided with at least two expandable rings 210 each having an insulating coating 350 thereon spaced inwardly at the edge of the cast band of the cylindrical tube 120 formed during the casting operation. on the opposite end section within 450mm of the section. Figure 9 shows a cross-sectional view longitudinally through a portion of a casting roll having an expandable ring 210 with a barrier coating 350 thereon spaced from an edge portion of the casting belt and having a heating element 370 .

Alternatively, as shown in FIG. 10 , at least two expandable rings 210 having a barrier coating 350 thereon are spaced on opposite end portions of the cylindrical tube 120 within 450 mm of the edge portion of the cast strip, which The edge portion of the casting roll is on the opposite end portion of the casting roll during the casting operation, and the additional expansion ring 220 with the barrier coating 330 thereon is positioned within the cylindrical tube 120 corresponding to the casting surface formed on the casting surface during casting. The position of the central part of the belt.

In another alternative, as shown back in FIG. 3A , the expandable ring 220 with the barrier coating 330 thereon may be positioned within the cylindrical tube 120 at a point corresponding to the cast belt formed on the casting rolls during casting. The location of the central part on the casting surface.

As shown in Figures 8-10, the expansion ring with the barrier coating thereon may be positioned within and adjacent to the cylindrical tube and spaced from the edge portion of the cast belt. Each expandable ring may have a ring size between 50 and 150mm; (eg 70mm). Similarly, the one or more expandable rings with the barrier coating thereon positioned corresponding to the central portion of the cast strip formed during casting may have a ring size between 50 and 150 mm; (eg 70 mm).

Each expandable ring with barrier coating spaced from an edge portion of the cast belt may have a width of up to 200mm (eg, 83.5mm). Similarly, the one or more expandable rings with the barrier coating thereon positioned in the central portion of the casting belt during casting may have a width of up to 200mm (eg, 83.5mm).

The deformation of the crown of the casting surface of the casting rolls can be controlled by adjusting the radial dimension of at least one expansion ring located inside the cylindrical tube. The radial dimension of the at least one expandable ring having the barrier coating thereon may be controlled by adjusting the temperature of the expandable ring. Furthermore, the radius of the expansion ring and thus the convexity of the casting surfaces of the casting rolls can be used to control the thickness profile of the cast strip. Since the circumferential thickness of the cylindrical tube is manufactured to a thickness not greater than 80 mm, the convexity of the casting surface can be deformed in response to changes in the radial dimension of the expansion ring.

Each expandable ring having an insulating coating thereon is adapted to increase in radial dimension such that expansion of the cylindrical tube during casting changes the convexity of the casting surface and the thickness profile of the cast strip. Power lines 222 and control lines 224 extend from slip rings 240 to each expansion ring. Power lines 222 supply power to the expansion ring. Control line 224 provides temperature feedback, which is then used to control power to the expansion loop.

As shown in Figure 11, each expansion ring may have a water passage 340 therein through which water may flow. Water flow can be controlled to regulate the expansion of the expansion ring.

Each expandable ring can be electrically heated to increase in radial dimension. As shown in Figure 15, each expandable ring may have at least one heating element positioned as desired to effectively heat the ring. For this purpose, the expansion ring 300 has a heating element 310 on the right and a heating element 320 has a heating element on the left. Each expansion ring can provide a heating input of up to 30kW; preferably at least 3kW. The forces generated by the increase in radial dimension will be exerted on the cylindrical tube such that the expansion of the cylindrical tube changes the convexity of the casting surface and the thickness profile of the cast strip. To achieve the desired thickness profile by controlling the radial dimension of the expansion ring and controlling the casting rotation, a strip thickness profile sensor 71 may be positioned downstream to detect the cast strip thickness profile 21 as shown in Figures 2 and 2A. A strip thickness sensor 71 is typically provided between the nip 18 and the pinch rolls 31A to provide direct control of the casting rolls 12 . The sensor may be an x-ray gauge or other suitable device capable of periodically or continuously measuring directly the thickness profile across the width of the strip. Alternatively, a plurality of non-contact sensors are arranged across the casting belt 21 at the roller table 30, and the combination of thickness measurements from the multiple locations across the casting belt 21 is processed by the controller 72, periodically or continuously with the belt. Determine the thickness profile. The thickness profile 21 of the cast strip can be determined periodically or continuously from this data as desired.

The radial dimension of each expandable ring can be controlled independently of the radial dimension of the other one or more expandable rings. The radial dimensions of each expandable ring having the barrier coating thereon within and adjacent to the belt edge of the casting rolls can be controlled independently of each other. Furthermore, the radial dimension of the expansion rings within and adjacent to the belt edge of the casting rolls may be controlled independently of the one or more expansion rings corresponding to the central portion of the casting belt with the barrier coating thereon. Sensor 71 generates a signal indicative of the thickness profile of the cast strip. The radial dimension of each expandable ring having a barrier coating thereon is controlled according to the signal generated by the sensor, which in turn controls the roll crown of the casting surfaces of the casting rolls during the casting operation.

Furthermore, the casting roll drive may be controlled to vary the rotational speed of the casting rolls while also varying the radial dimension of the expansion ring in response to an electrical signal 71 received from the sensor, thereby controlling the roll crown of the casting surface of the casting rolls during the casting operation .

It has been found that a barrier coating is necessary to control the heat transfer from the expansion ring to the casting rolls. Tests carried out have shown that, with the barrier coating thereon, heat transfer from the expansion ring to the casting rolls during casting is minimal and the expansion ring can reach the desired temperature and expand, and thus the desired cross-sectional zone Thickness profiles to commercially control the convexity of casting surfaces.

To illustrate, Figure 12 shows tests performed with and without a barrier coating on the expandable ring. A barrier coating of 8% yttria stabilized zirconia was plasma sprayed onto the exterior of the expandable ring to give a barrier coating thickness of 0.025 inches. Each expansion ring has a section of the casting roll approximately 85 mm in width that is shrink fit onto the expansion ring. Each casting roll section has a water passage therethrough. Water was supplied at approximately 15 psi and the water flow varied between 8.6 and 8.9 gpm. The inlet water temperature was 68°F. Separate tests were performed at 50% power and at 100% power. As shown in Figure 12, the expansion ring resulted in a peak incremental temperature of 54°C when tested at 50% power. Whereas the expansion ring with the barrier coating thereon resulted in a peak delta temperature of 90°C, ie a 67% increase in peak delta temperature. As shown in Figure 12, during testing, heating of the uncoated expandable ring at 100% power failed; Peak delta temperature.

Figure 13 shows a plot of mean expansion ring temperature versus edge drop. The edge drop is related to the thickness of the cast strip. As shown in Figure 13, edge dips appear as changes in the expansion ring temperature each in response to heating. As the temperature increases, the expansion ring expands; the strip thickness at the edges of the casting rolls decreases and the edge drop increases.

Figure 14 shows a graph of heated ring expansion versus temperature of an expanded ring coated with a barrier coating. The expansion ring is located adjacent to and within the casting rolls, the casting rolls being provided with water passages through them and through which water flows during normal casting operation. The coated expansion ring was heated from 85.6°F to 120°F. After a brief hold at 120°F, the expandable ring with barrier coating was heated to 160°F and 200°F. As demonstrated, a dimensional expansion of over 100 μm was achieved when the coated expandable ring was heated at 115°F. As explained, these results would not be possible with uncoated expandable rings because of the heat transfer to the casting rolls. The expansion of the expandable ring is directly related to the temperature to which the expandable ring can be heated. As illustrated, an expansion ring coated with a barrier coating can be heated rapidly and achieve efficient temperatures. As such, a barrier coating of at least 0.010 inches (eg, 0.025 inches) in thickness is necessary to control or eliminate heat transfer from the expansion ring to the casting rolls.

In each of these embodiments of the method and apparatus, the expandable ring may also have water passages therethrough to allow water flow through the passages in the ring, and to regulate water flow through those passages. The water flow is adjusted to increase or decrease the diameter of the expansion ring, and thus the cylindrical tube, as desired, and to control the shape of the casting rolls during operation.

While the principles and modes of operation have been explained and described with respect to particular embodiments, it must be understood that the invention may be made otherwise than as specifically explained and described without departing from its spirit or scope.

Claims (53)

1. it is a kind of by controlling roll crown come the method for continuously casting strip, it the described method comprises the following steps：

A. casting machine is assembled, the casting machine has the casting roll of a pair of of phase reverse rotation, and the casting roll of the pair of phase reverse rotation is in-between With roll gap, Cast Strip can be delivered downward from the roll gap, each casting roll has the casting surface formed by cylindrical tube, described Cylindrical tube has the material selected from the group being made of copper and copper alloy no more than 80 mm of thickness, optionally has and is coated in Metal or metal alloy thereon, and with the multiple longitudinal water-flowing paths for extending through the cylindrical tube；

B. at least two expansion loops are located in it is in the cylindrical tube and adjacent with the cylindrical tube, and in the Cast Strip The marginal portion being formed in during casting manipulations in the opposite end portions of the casting roll 450mm in be spaced, it is each swollen Tensioner ring has at least one heating element and isolation coating thereon and is adapted for increasing on radial dimension so that in the phase of casting Between cylindrical tube expansion change the casting roll casting surface roll crown and the Cast Strip thickness profile；

C. metal delivery system is assembled, the metal delivery system can form casting pond, and the casting pond is supported on the casting roll The casting surface above the roll gap, have the side seal board adjacent with the end of the roll gap, to limit the casting Pond；And

D. it is controlled described swollen in response at least one of the digital signal received from least one sensor or analog signal The radial dimension of tensioner ring, to control the roll crown of the casting surface of the casting roll during the casting manipulations.

2. the method according to claim 1 for continuously casting strip by controlling roll crown, further comprising the steps of：

E. at least one sensor is positioned, at least one sensor can sense at least one of following property：

The temperature of the expansion loop；

The thickness profile of the Cast Strip in downstream；

The Cast Strip is in the local thickness limited at point close to the Cast Strip edge；

Casting roller surface convexity during the casting manipulations；

Radial casting roll dilation close at the restriction point at the Cast Strip edge；

And generate the signal of at least one of digital signal or analog signal or the above-mentioned property of the instruction Cast Strip.

3. the method according to claim 1 for continuously casting strip by controlling roll crown, further comprising the steps of：

E. corresponding to the center portion on being formed in the casting roll during casting of the Cast Strip and by least one expansion loop It is located in the cylindrical tube, each expansion loop has at least one heating element and isolation coating thereon and is adapted for Change on radial dimension so that change in the expansion of the cylindrical tube during casting the convexity of the casting roll casting surface and The thickness profile of the Cast Strip.

4. the method according to claim 2 for continuously casting strip by controlling roll crown, further comprising the steps of：

F. corresponding to the center portion on being formed in the casting roll during casting of the Cast Strip and by least one expansion loop It is located in the cylindrical tube, each expansion loop has at least one heating element and isolation coating thereon and is adapted for Change on radial dimension so that change in the expansion of the cylindrical tube during casting the convexity of the casting roll casting surface and The thickness profile of the Cast Strip.

5. the method according to claim 1 for continuously casting strip by controlling roll crown, further comprising the steps of：

E. water passage is provided in each expansion loop, wherein water can flow through the water passage, and control the flow Move and adjust the expansion of the expansion loop.

6. the method according to claim 3 for continuously casting strip by controlling roll crown, further comprising the steps of：

F. water passage is provided in each expansion loop, wherein water can flow through the water passage, and control the flow Move and adjust the expansion of the expansion loop.

7. the method according to claim 1 for continuously casting strip by controlling roll crown, wherein the expansion loop Heating element be made of stainless steel, nickel or nickel alloy.

8. the method according to claim 2 for continuously casting strip by controlling roll crown, further comprising the steps of：

F. in digital signal or at least one of the analog signal in response to being received from least one sensor and controlling has The radial dimension of the expansion loop of isolation coating thereon during the casting manipulations to control the casting table of the casting roll When the roll crown in face, control casting roll driver is to change the rotary speed of the casting roll.

9. the method according to claim 4 for continuously casting strip by controlling roll crown, further comprising the steps of：

G. change in digital signal or at least one of analog signal in response to being received from least one sensor With isolation coating thereon and with the radial dimension of the expansion loop at the marginal portion interval of the Cast Strip and corresponding In the radial dimension with each expansion loop for completely cutting off coating thereon of the center portion of the Cast Strip to make in the casting When controlling the roll crown of the casting surface of the casting roll during industry, control casting roll driver is to change the rotation speed of the casting roll Degree.

10. the method according to claim 1 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and there is the ring size between 50 and 150mm with each expansion loop at the marginal portion interval of the Cast Strip.

11. the method according to claim 3 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and there is the ring size between 50 and 150mm with each expansion loop at the marginal portion interval of the Cast Strip, and Corresponding to the Cast Strip center portion with thereon isolation coating each expansion loop with the ring between 50 and 150mm Size.

12. the method according to claim 1 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and there is the width up to 200mm with each expansion loop at the marginal portion interval of the Cast Strip.

13. the method according to claim 3 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and there is the width up to 200mm with each expansion loop at the marginal portion interval of the Cast Strip, and corresponds to Each expansion loop with isolation coating thereon of the center portion of the Cast Strip is with the width up to 200mm.

14. the method according to claim 1 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and provides the heating input up to 30kW with each expansion loop at the marginal portion interval of the Cast Strip.

15. the method according to claim 3 for continuously casting strip by controlling roll crown, wherein having thereon Completely cut off coating and provide the heating input up to 30kW with each expansion loop at the marginal portion interval of the Cast Strip, and is corresponding The heating input up to 30kW is provided in each expansion loop for the isolation coating of the center portion of the Cast Strip having thereon.

16. according to claim 1 by controlling roll crown come the method that continuously casts strip, wherein can be independently of Control the roll crown of the casting surface of the casting roll and control with thereon isolation coating and with the marginal portion of the Cast Strip The radial dimension of each expansion loop at interval.

17. it is according to claim 3 by control roll crown come the method for continuously casting strip, can be independently of control The roll crown of the casting surface of the casting roll and controlling wherein have isolation coating thereon and with the marginal portion of the Cast Strip Each expansion loop at interval and corresponding to the Cast Strip center portion the isolation coating having thereon each expansion loop Radial dimension.

18. it is according to claim 4 by controlling roll crown come the method for continuously casting strip, further include following step Suddenly：

G. in response to being received from least one sensor digital signal or at least one of analog signal change institute When stating roll crown of the radial dimension of expansion loop to control the casting surface of the casting roll during the casting manipulations, institute is controlled The position for stating casting roll has each of isolation coating thereon swollen to change the horizontal distance between the casting roll axis center line Tensioner ring corresponds at least one of center portion or the marginal portion of Cast Strip property.

19. it is a kind of by controlling roll crown come the method for continuously casting strip, it the described method comprises the following steps：

A. casting machine is assembled, there is the casting machine casting roll of a pair of of phase reverse rotation, the casting roll to have roll gap therebetween, can be from institute It states roll gap and delivers Cast Strip downward, there is each casting roll the casting surface formed by cylindrical tube, the cylindrical tube to have little In the material selected from the group being made of copper and copper alloy of 80 mm of thickness, optionally there is the metal or metal coated on it Alloy, and with the multiple longitudinal water-flowing paths for extending through the cylindrical tube；

It b. will be at least one swollen corresponding to the center portion of the Cast Strip being formed in during casting manipulations in the casting roll Tensioner ring is located in the cylindrical tube, and isolation of at least one expansion loop at least one heating element and thereon applies It layer and is adapted for changing on radial dimension so that change the casting surface in the expansion of the cylindrical tube during casting The thickness profile of convexity and the Cast Strip；

C. metal delivery system is assembled, the metal delivery system can form casting pond, and the casting pond is supported on the casting roll The casting surface above the roll gap, have the side seal board adjacent with the end of the roll gap, to limit the casting pond；

D. controlled in response at least one of the digital signal received from least one sensor or analog signal it is described to The radial dimension of the expansion loop of the few one isolation coating having thereon, to control the casting roll during the casting manipulations The roll crown of casting surface.

20. it is according to claim 19 by controlling roll crown come the method for continuously casting strip, further include following step Suddenly：

E. at least one sensor is positioned, at least one sensor can sense at least one of following property：

The temperature of at least one expansion loop；

The thickness profile of the Cast Strip in downstream；

The Cast Strip is in the local thickness limited at point close to the Cast Strip edge；

Casting roller surface convexity during the casting manipulations；

Radial casting roll dilation close at the restriction point at the Cast Strip edge；

And generate the signal of at least one of digital signal or analog signal or the above-mentioned property of the instruction Cast Strip.

21. it is according to claim 19 by controlling roll crown come the method for continuously casting strip, further include following step Suddenly：

E. water passage is provided at least one expansion loop, wherein water can flow through the water passage, and control The water flowing and the expansion for adjusting at least one expansion loop.

22. according to claim 19 by controlling roll crown come the method that continuously casts strip, wherein it is described at least One heating element is made of stainless steel, nickel or nickel alloy.

23. it is according to claim 20 by controlling roll crown come the method for continuously casting strip, further include following step Suddenly：

F. change in digital signal or at least one of analog signal in response to being received from least one sensor The radial dimension of the expansion loop of at least one isolation coating having thereon is with described in the control during the casting manipulations When the roll crown of the casting surface of casting roll, control casting roll driver is to change the rotary speed of the casting roll.

24. according to claim 19 by controlling roll crown come the method that continuously casts strip, wherein it is described at least One expansion loop with isolation coating thereon is with the ring size between 50 and 150mm.

25. according to claim 19 by controlling roll crown come the method that continuously casts strip, wherein it is described at least One expansion loop with isolation coating thereon is with the width up to 200mm.

26. according to claim 19 by controlling roll crown come the method that continuously casts strip, wherein it is described at least The expansion loop of one isolation coating having thereon provides the heating input up to 30kW.

27. the method according to claim 19 for continuously casting strip by controlling roll crown, wherein can be independent In the roll crown for the casting surface for controlling the casting roll control corresponding to the Cast Strip center portion have thereon every Each expansion loop of exhausted coating.

28. it is according to claim 20 by controlling roll crown come the method for continuously casting strip, further include following step Suddenly：

F. change in digital signal or at least one of analog signal in response to being received from least one sensor The radial dimension of at least one expansion loop is convex with the roller for controlling the casting surface of the casting roll during the casting manipulations When spending, the position of the casting roll is controlled, to change the horizontal distance between the casting roll axis center line, there is isolation thereon to apply Each expansion loop of layer corresponds at least one of the center portion of Cast Strip property.

29. a kind of equipment continuously casting strip by controlling roll crown, the equipment include：

A. the casting roll of a pair of of phase reverse rotation, the casting roll of the pair of phase reverse rotation have roll gap therebetween, can be from the roll gap Cast Strip is delivered downward, and there is each casting roll the casting surface formed by cylindrical tube, the cylindrical tube to have no more than 80 millis The material selected from the group being made of copper and copper alloy of meter Hou Du optionally has the metal or metal alloy being coated on, And with the multiple longitudinal water-flowing paths for extending through the cylindrical tube；

B. at least two expansion loop, at least two expansion loop be located in the cylindrical tube and with the cylindrical tube It is adjacent, and in the marginal portion of the Cast Strip being formed in during casting manipulations in the opposite end portions of the casting roll Interval in 450mm, each expansion loop have at least one heating element and isolation coating thereon and are adapted in radial ruler Very little upper change so that the cylindrical tube changes the roll crown of the casting surface of the casting roll and the casting in expansion during casting The thickness profile of band；

C. metal delivery system, the metal delivery system are located in above the roll gap and can form casting pond, the casting Pond is supported on the casting surface of the casting roll, has the side seal board adjacent with the end of the roll gap, to limit the casting Pond.

30. it is according to claim 29 by controlling roll crown come the equipment for continuously casting strip, further include：

D. at least one sensor can sense at least one of following property：

The temperature of the expansion loop；

The thickness profile in the downstream for being located in the roll gap of the Cast Strip；

The Cast Strip is in the local thickness limited at point close to the Cast Strip edge；

Casting roller surface convexity during the casting manipulations；

Radial casting roll dilation close at the restriction point at the Cast Strip edge；

And the signal that at least one of digital signal or analog signal or the above-mentioned property of instruction can be generated, in response to from At least one sensor received signal and the radial dimension for controlling the expansion loop, to be controlled during the casting manipulations Make the roll crown of the casting surface of the casting roll.

31. it is according to claim 29 by controlling roll crown come the equipment for continuously casting strip, further include：

D. at least one expansion loop, at least one expansion loop is in the cylindrical tube, corresponding to the Cast Strip in institute The center portion being formed in during stating casting manipulations in the casting roll, each expansion loop is at least one heating element and thereon Isolation coating and be adapted for changing on radial dimension so that change the casting in the expansion of the cylindrical tube during casting Make a list face roll crown and the Cast Strip thickness profile.

32. it is according to claim 30 by controlling roll crown come the equipment for continuously casting strip, further include：

E. at least one expansion loop, at least one expansion loop is in the cylindrical tube, corresponding to the Cast Strip in institute The center portion being formed in during stating casting manipulations in the casting roll, each expansion loop is at least one heating element and thereon Isolation coating and be adapted for changing on radial dimension so that the cylindrical tube changes the casting in expansion during casting Make a list face roll crown and the Cast Strip thickness profile.

33. it is according to claim 30 by controlling roll crown come the equipment for continuously casting strip, further include：

E. control system, can change in response to the electric signal received from least one sensor with thereon every Exhausted coating and with the radial dimension of the expansion loop at the marginal portion interval of the Cast Strip to be controlled during the casting manipulations When making the roll crown of the casting surface of the casting roll, controls casting roll driver and change the rotary speed of the casting roll.

34. it is according to claim 32 by controlling roll crown come the equipment for continuously casting strip, further include：

F. control system, can change in response to the electric signal received from least one sensor with thereon every Exhausted coating and with the radial dimension of the expansion loop at the marginal portion interval of the Cast Strip and corresponding to the center of the Cast Strip The radial dimension of partial at least one expansion loop with isolation coating thereon during the casting manipulations to control When making the roll crown of the casting surface of the casting roll, controls casting roll driver and change the rotary speed of the casting roll.

35. the equipment according to claim 29 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and there is ring size between 50 and 150mm with each expansion loop at the marginal portion interval of the Cast Strip.

36. the equipment according to claim 31 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and there is ring size between 50 and 150mm with each expansion loop at the marginal portion interval of the Cast Strip, and And corresponding to each expansion loop with isolation coating thereon of the center portion of the Cast Strip between 50 and 150mm Ring size.

37. the equipment according to claim 29 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and with each expansion loop at the marginal portion interval of the Cast Strip have up to 200mm width.

38. the equipment according to claim 31 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and there is the width up to 200mm with each expansion loop at the marginal portion interval of the Cast Strip, and it is corresponding In the Cast Strip center portion with thereon isolation coating each expansion loop with the width up to 200mm.

39. the equipment according to claim 29 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and with each expansion loop at the marginal portion interval of the Cast Strip provide up to 30kW heating input.

40. the equipment according to claim 31 for continuously casting strip by controlling roll crown, wherein with thereon Isolation coating and provide the heating up to 30kW with each expansion loop at the marginal portion interval of the Cast Strip and input, and it is right The each expansion loop for the isolation coating of the center portion of Cast Strip described in Ying Yu having thereon provides the heating input up to 30kW.

41. it is according to claim 29 by control roll crown come the equipment for continuously casting strip, can be independently of control Make the roll crown of the casting surface of the casting roll and control wherein have isolation coating thereon and with the edge part of the Cast Strip Divide the radial dimension of each expansion loop at interval.

42. the equipment according to claim 31 for continuously casting strip by controlling roll crown, wherein can be independent In the roll crown for the casting surface for controlling the casting roll control with isolation coating thereon and with the edge part of the Cast Strip Divide each expansion loop for completely cutting off coating of each expansion loop at interval and the center portion corresponding to the Cast Strip having thereon Radial dimension.

43. the equipment according to claim 29 for continuously casting strip by controlling roll crown, wherein the heating Element is made of stainless steel, nickel or nickel alloy.

44. the equipment according to claim 31 for continuously casting strip by controlling roll crown, wherein the heating Element is made of stainless steel, nickel or nickel alloy.

45. a kind of equipment continuously casting strip by controlling roll crown, the equipment include：

A. the casting roll of a pair of of phase reverse rotation, the casting roll of the pair of phase reverse rotation have roll gap therebetween, can be from the roll gap Cast Strip is delivered downward, and there is each casting roll the casting surface formed by cylindrical tube, the cylindrical tube to have no more than 80 millis The material selected from the group being made of copper and copper alloy of meter Hou Du optionally has the metal or metal alloy being coated on, And with the multiple longitudinal water-flowing paths for extending through the cylindrical tube；

B. at least one expansion loop, at least one expansion loop are being cast in the cylindrical tube corresponding to the Cast Strip It is formed in during affected industry at the position of the center portion in the casting roll, at least one expansion loop has at least one add Thermal element and isolation coating thereon, at least one expansion loop are adapted for changing on radial dimension so that the cylinder Shape pipe changes the thickness profile of the convexity and the Cast Strip of casting surface in expansion during casting；

C. metal delivery system, the metal delivery system are located in above the roll gap, and can form casting pond, the casting Pond is supported on the casting surface of the casting roll, has the side seal board adjacent with the end of the roll gap, to limit the casting Pond.

46. it is according to claim 45 by controlling roll crown come the equipment for continuously casting strip, further include：

D. at least one sensor can sense at least one of following property：

The temperature of at least one expansion loop；

The thickness profile in the downstream for being located in the roll gap of the Cast Strip；

The Cast Strip is in the local thickness limited at point close to Cast Strip center；

Casting roller surface convexity during the casting manipulations；

Radial casting roll dilation close at the restriction point in Cast Strip center；

And the signal that at least one of digital signal or analog signal or the above-mentioned property of instruction can be generated, in response to from At least one sensor received signal and the radial dimension for controlling at least one expansion loop, to make in the casting The roll crown of the casting surface of the casting roll is controlled during industry.

47. it is according to claim 46 by controlling roll crown come the equipment for continuously casting strip, further include：

E. control system can change described at least one in response to the electric signal received from least one sensor When roll crown of the radial dimension of expansion loop to control the casting surface of the casting roll during the casting manipulations, casting roll is controlled Driver and the rotary speed for changing the casting roll.

48. the equipment according to claim 45 for continuously casting strip by controlling roll crown, wherein corresponding to institute At least one expansion loop with isolation coating thereon of the center portion of Cast Strip is stated with the ring between 50 and 150mm Size.

49. the equipment according to claim 45 for continuously casting strip by controlling roll crown, wherein corresponding to institute At least one expansion loop with isolation coating thereon of the center portion of Cast Strip is stated with the width up to 200mm.

50. the equipment according to claim 45 for continuously casting strip by controlling roll crown, wherein corresponding to institute At least one expansion loop offer for stating the isolation coating of the center portion of Cast Strip having thereon is defeated up to the heating of 30kW Enter.

51. the equipment according to claim 45 for continuously casting strip by controlling roll crown, wherein can be independent In the roll crown for the casting surface for controlling the casting roll control corresponding to the Cast Strip center portion have thereon every Each expansion loop of exhausted coating.

52. according to claim 45 by controlling roll crown come the equipment that continuously casts strip, further include it is described extremely Water passage in a few expansion loop, wherein water can flow through the water passage, and control the water flowing and adjust The expansion of at least one expansion loop.

53. according to claim 45 by controlling roll crown come the equipment that continuously casts strip, wherein it is described at least One heating element is made of stainless steel, nickel or nickel alloy.