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WO2025185877A1 - Équipement de coulée et de laminage combinés présentant une productivité améliorée - Google Patents

Équipement de coulée et de laminage combinés présentant une productivité améliorée

Info

Publication number
WO2025185877A1
WO2025185877A1 PCT/EP2025/051641 EP2025051641W WO2025185877A1 WO 2025185877 A1 WO2025185877 A1 WO 2025185877A1 EP 2025051641 W EP2025051641 W EP 2025051641W WO 2025185877 A1 WO2025185877 A1 WO 2025185877A1
Authority
WO
WIPO (PCT)
Prior art keywords
strand
metal strand
cast metal
continuous casting
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2025/051641
Other languages
German (de)
English (en)
Other versions
WO2025185877A8 (fr
Inventor
Simon Grosseiber
Lukas Preuler
Gero Schwarz
Josef Watzinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Publication of WO2025185877A1 publication Critical patent/WO2025185877A1/fr
Publication of WO2025185877A8 publication Critical patent/WO2025185877A8/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Definitions

  • the present invention is based on an operating method for a combined casting and rolling plant, wherein in normal operation of the combined casting and rolling plant
  • the continuous casting mould is cooled by means of a primary cooling system of the continuous casting plant
  • the cast metal strand is withdrawn downwards from the continuous casting mould at a normal withdrawal speed by means of a strand guide of the continuous casting plant arranged downstream of the continuous casting mould and is gradually deflected into the horizontal position by means of the strand guide,
  • the cast metal strand is cooled during passage through the strand guide by means of a secondary cooling system of the continuous casting plant with a normal cooling intensity
  • the cast metal strand after leaving the strand guide of the continuous casting plant, first passes a separating device of the combined casting and rolling plant and is then rolled into a metal strip with a normal strip thickness in a rear section of a rolling mill of the combined casting and rolling plant comprising at least one rolling stand,
  • the normal cooling intensity is determined in such a way that the cast metal strand is completely solidified before reaching the separating device
  • the metal strip is separated from the cast metal strand only after passing through the rear section of the rolling mill, whereby the pouring of the liquid metal into the continuous casting mould is terminated at a final point in time, so that the final point in time represents the transition of the operation of the combined casting and rolling mill from normal operation to special operation.
  • continuous rolling process should not be understood as meaning that a metal strand is cast for an indefinite length of time, which is then immediately rolled out of the casting heat and without prior separation into sections in the rolling mill. Rather, the casting process must be interrupted from time to time.
  • the main reasons for such interruptions are planned interruptions, for example, for maintenance or changing equipment such as the tundish and pouring tube, and unplanned interruptions due to disruptions, for example, in the upstream production of liquid metal.
  • the casting-rolling plant is operated in a special mode.
  • the object of the present invention is to create possibilities by means of which the productivity of the casting-rolling composite plant can be increased.
  • an operating method of the type mentioned at the outset is designed in that in the special operation of the casting-rolling plant
  • the cast metal strand continues to be drawn downwards from the continuous casting mould by means of the strand guide and is gradually deflected into the horizontal position by means of the strand guide, but the drawing off takes place at a special drawing-off speed which is lower than the normal drawing-off speed, at least during a special period following the completion time,
  • the continuous casting mould is cooled by means of primary cooling at least as long as a part of the cast metal strand is still in the continuous casting mould,
  • the cast metal strand after leaving the strand guide of the continuous casting plant, initially continues to pass the separating device and is rolled by the rear section of the rolling mill into the metal strip with the normal strip thickness as specified at the time of completion, - by means of the separating device, the cast metal strand is separated at a separation point related to the cast metal strand at a separation time after the completion time, and
  • the section of the cast metal strand which lies before the cutting point is rolled into the metal strip with the normal strip thickness as specified at the time of completion.
  • Normal operation is generally known and entirely conventional. Due to the cooling of the liquid metal by primary cooling, the liquid metal solidifies on the walls of the continuous casting mold to form a metal strand with a strand shell and a still-liquid core. Due to the cooling of the metal strand by secondary cooling, the strand shell gradually thickens, so that the liquid core of the metal strand gradually solidifies.
  • the slump tip i.e. the point of the metal strand where the metal strand has just completely solidified, is still within the continuous casting plant and thus always in front of the separating device. If a front section of the rolling mill, which includes at least one rolling stand, is located between the continuous casting plant and the separating device, the slump tip is usually also in front of the front section of the rolling mill.
  • the metal strand Due to the fact that the metal strip is separated from the metal strand only after it has passed through the rolling mill, the metal strand provides a direct connection between the continuous casting plant and the rolling mill, in particular with the rear section of the rolling mill.
  • Strip gauge is the thickness of the metal strip after rolling in the rear rolling stands of the rolling mill. Although it can change from time to time, it remains constant for an extended period of time after a change.
  • the metal that is cast into the metal strand and later rolled into the metal strip is often steel. However, it can also be another metal, such as aluminum, copper, or brass.
  • the speed at which the metal strand can be withdrawn from the continuous casting mold is considerably lower than the speed at which the cast metal strand could be rolled in the rolling mill.
  • the normal withdrawal speed is therefore the limiting factor for the throughput of the combined casting and rolling plant. For this reason, the normal withdrawal speed is generally selected to be as high as possible. A withdrawal speed below the maximum possible speed is also possible, but only within certain limits. If a certain minimum speed is not met, coupled operation of the continuous casting plant and the rolling mill is no longer possible. In this case, the cast metal strand must be divided into individual slabs before rolling the cast metal strand. This division is avoided in combined operation, in which the continuous casting plant and the rolling mill are directly coupled.
  • the cooling of the continuous casting mold is maintained, at least initially, i.e., as long as there is still metal in the mold.
  • the withdrawal of the cast metal strand is also maintained. However, the withdrawal of the cast metal strand takes place at a lower withdrawal speed. Rolling initially continues to the normal strip thickness, i.e., the same strip thickness to which the cast metal strand will be rolled at the final stage.
  • cooling intensity is coordinated with the withdrawal speed. This applies equally to normal cooling intensity, special cooling intensity, and further special cooling intensity. Coordination with the withdrawal speed means that, at the same cooling intensity, the amount of heat removed from a specific section of the cast metal strand in the strand guide by secondary cooling is independent of the withdrawal speed at which the section passes through the strand guide. This is explained below using an example.
  • a metal strand is cast at a specific casting speed of, for example, 5 m/min.
  • a section of the cast metal strand of a predetermined length has a thermal energy content of X.
  • the secondary cooling is operated with a specific coolant quantity per unit of time, which is related only to the time. This coolant quantity defines a specific cooling intensity.
  • the casting speed is increased from 5 m/min to 5.5 m/min.
  • the section of the cast metal strand still has the thermal energy content X. Due to the higher withdrawal speed, the section of the cast metal strand passes through the strand guide in a shorter period of time. At the end of the strand guide, the strand should still have the thermal energy content Z. Consequently, the amount of thermal energy Y must still be extracted from the section of the cast metal strand.
  • the secondary cooling must therefore be operated with a certain larger amount of coolant per unit of time, which is only related to time. The cooling intensity, however, remains unchanged, since the amount of thermal energy Y is still extracted from the section of the cast metal strand in the strand guide.
  • the additional cooling intensity is usually determined to be equal to the normal cooling intensity. It may be slightly reduced because the longer residence time of a cast section of the metal strand in the strand guide may result in greater heat radiation. Due to the cooling of the early section of the cast metal strand with the additional special cooling intensity, the temperature at which the early section is conveyed out of the strand guide remains unchanged, or at least almost unchanged, compared to the temperature at which a comparable section is conveyed out of the strand guide during normal operation. However, due to the more intensive cooling of the late section of the cast metal strand, a type of lid forms relatively quickly at the upper end of the cast metal strand, which encloses the liquid core. The complete solidification of the cast metal strand also occurs somewhat earlier. Thus, the liquid core cannot escape from the cast metal strand even if the cast metal strand is deflected into the horizontal position.
  • the length of the special period can be determined as needed. It will usually be in the range of several minutes.
  • the withdrawal speed can either be maintained at the (smaller) value of the special withdrawal speed or increased again, either to the normal withdrawal speed or to a value between the special and normal withdrawal speed.
  • the procedure according to the invention makes it possible to continue producing the (correct) metal strip in the rolling mill initially – i.e., until the cutting point – by increasing the productivity of the combined casting and rolling mill.
  • the direct coupling between the continuous casting plant and the rear section of the rolling mill is also eliminated.
  • This makes it possible to roll the remaining section of the cast metal strand, which has already passed the cutting device at the time of cutting, to the strip thickness. Any reduction in the temperature of the remaining section can be counteracted by increasing the rolling speed. This increase in rolling speed is possible because, from the cutting point onwards, there is no longer any direct coupling with the continuous casting plant. Downstream of the rear section of the rolling mill, the metal strip (rolled to the normal strip thickness) can continue to be cut as required.
  • the procedure according to the invention thus ensures that only the remaining section of the cast metal strand, which essentially consists of the last section of the cast metal strand and a (short) adjoining section of the cast metal strand, can no longer be rolled to the strip thickness and therefore accrues as scrap.
  • the inventive procedure thus enables a significantly higher material yield. Depending on the specific case, 15 to 80 tons more material can be rolled into the metal strip. Furthermore, correspondingly less scrap is generated, thus reducing the energy required for subsequent remelting.
  • the cutting device itself can be of a conventional nature.
  • the cutting device can be designed as a standard pendulum shear.
  • the separation point is not related to the combined casting and rolling plant and its components, but to the cast metal strand. It therefore moves along with the metal strand as it is conveyed.
  • the cast metal strand it is possible for the cast metal strand to be rolled exclusively after passing the cutting device. In this case, only the rear section of the rolling mill is available. However, it is also possible for the cast metal strand to be rolled into a preliminary strip with a standard intermediate thickness in a front section of the rolling mill comprising at least one roll stand before passing the cutting device. In this case, the front section of the rolling mill generally represents a so-called roughing mill, and the rear section a finishing mill. If the rolling mill is divided into a front section and a rear section, with the cutting device located between these two sections, in special operation, the section of the cast metal strand that lies before the cutting point is preferably rolled into the preliminary strip with the standard intermediate thickness by means of the front section of the rolling mill.
  • the section of the cast metal strand that lies after the cutting point is at least partially rolled to a special intermediate thickness that is greater than the intermediate thickness by means of the front section of the rolling mill. If necessary, the latter section of the cast metal strand can also pass through the front section of the rolling mill without rolling in special operation.
  • the section of the cast metal strand located before the cut is rolled to the normal intermediate thickness.
  • the thickness of the remaining section is greater than the normal intermediate thickness.
  • the section behind the cut continues to be scrap, but no longer.
  • the distance of the separation point from the end of the last section of the metal strand should be kept as short as possible. It is therefore envisaged that the distance of the separation point from the end of the last section of the metal strand is 50% of a metallurgical length or less, preferably 40% of the metallurgical length or less, and in particular 30% of the metallurgical length or less. On the other hand, the distance of the separation point from the end of the last section of the metal strand cannot be arbitrarily reduced. It is therefore envisaged that the distance of the separation point from the end of the last section of the metal strand is 10% of the metallurgical length or more, preferably 15% of the metallurgical length or more, and in particular 20% of the metallurgical length or more.
  • the metallurgical length refers to normal operation. The term is well known and familiar to experts. It is the length of the liquid core of the cast metal strand, viewed in the strand direction, i.e., the distance between the melt tip and the casting level.
  • the strand guide has several segments.
  • the segments are preferably advanced in special operation while the last section of the cast metal strand passes through the respective segment. This increases the thickness of the cast metal strand for the last section of the cast metal strand.
  • the casting level drops slightly compared to the upper end of the already solidified strand shell. This reliably prevents any sloshing out of still-molten metal.
  • the time at which the separation point is within the effective range of the separation device is determined by means of path tracking, and this time is defined as the separation time.
  • the separation point is determined in advance, and then, by means of path tracking, it is determined when the separation point reaches the separation device. This time is the separation time.
  • the last section of the cast metal strand is cooled on its top side in addition to its side surfaces, at least after it emerges from the continuous casting mold.
  • This procedure can improve and accelerate the formation of the "lid.” This makes the deflection of the last section of the cast metal strand to the horizontal less critical.
  • FIG 1 a casting-rolling compound plant
  • FIG 3 a timing diagram
  • FIG 4 a timing diagram
  • FIG 5 a timing diagram
  • FIG 6 Cooling intensities
  • FIG 7 a timing diagram
  • FIG 8 a timeline
  • FIG 9 a section of a strand guide and a metal strand
  • FIG 10 shows a strip thickness as a function of the location on the metal strand
  • FIG 11 an intermediate thickness as a function of location on the metal strand.
  • FIG. 1 shows a combined casting and rolling plant in normal operation.
  • liquid metal 1 is poured into a continuous casting mold 2, usually from a tundish (not shown). This creates a liquid level 3 in the continuous casting mold 2.
  • the continuous casting mold 2 is cooled by a primary cooling system of the continuous casting plant, as indicated by the symbol "H2O.”
  • the cast metal strand 4 is withdrawn downwards from the continuous casting mold 2 by means of a strand guide 5 at a withdrawal speed v.
  • the strand guide 5 has a plurality of rollers by means of which the cast metal strand 4 is supported on both sides. Only a few of the rollers are shown in FIG. 1 at the beginning and end of the strand guide 5. At least some of the rollers are driven. Due to the structural design of the strand guide 5, the strand guide 5 gradually deflects the metal strand 4 into the horizontal position. While passing through the strand guide 5, the metal strand 4 is cooled by means of a secondary cooling system 6 with a cooling intensity K (see later FIGS. 6 and 7). The cooling- The casting is often carried out using an atomized water-air mixture. Upon exiting the strand guide 5, the metal strand 4 has a casting thickness d1.
  • the metal strand 4 After emerging from the strand guide 5, the metal strand 4 passes a cutting device 7.
  • the cutting device 7 - for example a conventional pendulum shear - is not active during normal operation.
  • the metal strand 4 therefore passes the cutting device 7 without being cut by the cutting device 7.
  • the metal strand 4 can be rolled into a preliminary strip with an intermediate thickness d2 in a front section 8 of a rolling mill before passing the cutting device 7.
  • the front section 8 does not have to be present. If it is present, it comprises at least one rolling stand 9. Of the rolling stands 9, only the work rolls are shown in FIG. 1.
  • the number of two rolling stands 9 shown in FIG. 1 is purely exemplary.
  • the metal strand 4 After passing through the separating device 7, the metal strand 4 is rolled into a metal strip with a strip thickness d3 in a rear section 10 of the rolling mill.
  • the rear section 10 is always present. It also comprises at least one rolling stand 11. Of the rolling stands 11, only the work rolls are shown in FIG. 1. The number of three rolling stands 11 shown in FIG. 1 is purely exemplary.
  • the metal strand 4 extends continuously from the continuous casting mold 2 to behind the rear section 10 of the rolling mill.
  • Additional devices such as a cooling section (not shown), can be arranged between the rear section 10 of the rolling mill and the rear separating device 12 as required.
  • Other units can also be present.
  • a cooling device, a descaling device, and/or a continuous furnace can be arranged upstream of the front section 8 of the rolling mill and/or between the front and rear sections 8, 10 of the rolling mill.
  • These devices can optionally be arranged upstream or downstream of the separating device 7.
  • a coiling device is also typically arranged downstream of the rear separating device 12.
  • FIG. 2 shows - very schematically - the continuous casting mold 2 and the cast metal strand 4.
  • the strand guide 5 is not shown in FIG. 2 for the sake of clarity.
  • the metal strand 4 initially has only a strand shell 13. Inside, i.e. within the strand shell 13, a core 14 of the metal strand 4 is still liquid. The thickness of the strand shell 13 increases with increasing distance from the continuous casting mold 2 until the metal strand 4 is completely solidified.
  • the point 15 immediately before the point at which the metal- The point at which the metal strand 4 has completely solidified for the first time is usually referred to as the melt tip 15.
  • the distance L of the melt tip 15 from the casting level 3 is usually referred to as the metallurgical length L of the cast metal strand 4.
  • the metallurgical length L is often in the range between 12 m and 25 m.
  • the sump tip 15 is located in a region of the cast metal strand 4 that has only slightly deflected from the vertical to the horizontal. In practice, however, the sump tip 15 is located in a region where the deflection to the horizontal is already complete or at least essentially complete.
  • the sump tip 15 is located within the strand guide 5 and thus in particular (significantly) in front of the separating device 7.
  • the cooling intensity K is thus determined such that the metal strand 4 is completely solidified before reaching the separating device 7. If the front section 8 of the rolling mill is present, the metal strand 4 is generally also completely solidified before reaching the front section 8. Furthermore, the exact position of the sump tip 15 is of secondary importance within the scope of the present invention.
  • Normal operation is carried out according to FIG 3 until a termination time t1.
  • the pouring of the liquid metal 1 into the continuous casting mold 2 is terminated.
  • the termination time t1 represents the transition of the operation of the combined casting and rolling plant from normal operation to special operation. During times after the termination time t1, the combined casting and rolling plant is therefore operated in special operation.
  • the cast metal strand 4 continues to be drawn downwards out of the continuous casting mold 2 by means of the strand guide 5.
  • the metal strand 4 is also gradually deflected horizontally by means of the strand guide 5.
  • the withdrawal speed v is reduced from the normal value v1 to a lower value v2, hereinafter also referred to as the special withdrawal speed v2, at least during a special period 16 following the final time t1.
  • the withdrawal speed v can be increased again. The increase can be continued as needed up to the normal withdrawal speed v1, to a value, which is still below the normal trigger speed v1, or to a value above the normal trigger speed v1.
  • the primary cooling of the continuous casting mold 2 is therefore initially maintained as shown in FIG 5. However, since no more liquid metal 1 is poured into the continuous casting mold 2, the meniscus 3 sinks as the metal strand 4 is withdrawn.
  • the primary cooling can be switched off. However, it can also be maintained for a while, for example, to cool the continuous casting mold 2. The primary cooling is switched off at a end time t2 as shown in FIG 5.
  • the cooling intensity K As the individual sections of the cast metal strand 4 pass through the strand guide 5, they are cooled with the cooling intensity K.
  • the sections of the metal strand are cooled with a cooling intensity K1, hereinafter referred to as normal cooling intensity K1.
  • a section 17 of the cast metal strand 4 passes through the strand guide 5, the section 17 is also cooled by means of the secondary cooling 6.
  • the corresponding cooling intensity K2 is hereinafter referred to as special cooling intensity K2.
  • the special cooling intensity K2 is thus greater than the normal cooling intensity K1.
  • the section 17 in question is, as shown in FIG 2, the section of the metal strand 4 which, at the completion time t1, is located in the continuous casting mold 2 and an upper region of the strand guide 5 adjoining the continuous casting mold 2.
  • This section 17 is hereinafter referred to as the last section 17 of the cast metal strand 4. If, however, a section 18 of the cast metal strand 4, which is also in the strand guide 5 at the completion time t1, but adjoins the last section 17 as shown in FIG 2, passes through the strand guide 5 (more precisely: the remaining part of the strand guide 5), the section 18 is also cooled by means of the secondary cooling 6.
  • the associated cooling intensity K3 can - see FIG 6 on the right - be as great as the normal cooling intensity K1.
  • the further special cooling intensity K3 can be smaller than the normal cooling intensity K1. This is indicated by the lower dashed line on the right in FIG 6.
  • the corresponding section 18 is hereinafter referred to as the early section 18 of the cast metal strand 4.
  • the separating device 7 is only activated at a separating time t5 (see FIG. 8).
  • the separating time t5 occurs after the completion time t1.
  • the cast metal strand 4 is only separated by the separating device 7 at the separating time t5.
  • the cast metal strand 4 continues to pass through the separating device 7 without being separated. If present, the cast metal strand 4 also passes through the front section 8 of the rolling mill beforehand.
  • the metal strand 4 extends continuously from the end 19 of the cast metal strand 4 (see FIG. 9) to at least the rear separating device 12.
  • the point 20 at which the metal strand 4 is separated by the separating device 7 is referred to below as the separating point 20.
  • the separating point 20 relates to the cast metal strand 4.
  • FIG. 10 shows the strip thickness d3 as a function of the location x on the cast metal strand 4.
  • the location x refers to the still unrolled metal strand 4.
  • FIG. 10 therefore shows the strip thickness d3 to which a respective location x of the cast, still unrolled metal strand 4 is rolled.
  • the metal strand 4 is first rolled in a section 21 to a value d3N, hereinafter referred to as the normal strip thickness d3N. Section 21 is rolled while the casting-rolling mill is in normal operation.
  • the rolling of the metal strand 4 to the normal strip thickness d3N is also maintained for a section 22, which is rolled in the rear section 10 of the rolling mill after the metal strand 4 has been separated by the separating device 7.
  • Section 22 is therefore located, relative to the metal strand 4, in front of the separating device 20.
  • Section 22 is also rolled to the normal strip thickness d3N by means of the rear section 10 of the rolling mill.
  • the rolling to the normal strip thickness d3N applies to the entire section 22, i.e. both to the area of the metal strand 4 that is rolled in the rear section 10 of the rolling mill before the metal strand 4 is cut by means of the cutting device 7, and to the area of the metal strand 4 that is rolled in the rear section 10 of the rolling mill after the metal strand 4 has been cut by means of the cutting device 7.
  • the entire section 22 of the metal strand 4 which lies in front of the separation point 20, is rolled into the metal strip with the normal strip thickness d3N.
  • FIG. 11 shows the intermediate thickness d2 as a function of the location x on the cast metal strand 4.
  • the location x relates to the cast, still unrolled metal strand 4.
  • FIG. 11 therefore shows the intermediate thickness d2 to which a respective location x of the unrolled metal strand 4 is rolled.
  • the metal strand 4 is rolled in section 21 to a value d2N, hereinafter referred to as the normal intermediate thickness d2N.
  • Section 21 is the same section 21 as explained above in connection with FIG. 10.
  • Section 22 is the same section 22 as explained above in connection with FIG. 10.
  • the rolling to the normal intermediate thickness d2N applies to the entire section 22, i.e., the entire area of the metal strand 4 that lies before the cutting point 20.
  • the rolling of the last part of section 22 takes place—as does the rolling of the metal strand 4 in general—before the metal strand 4 is cut by means of the cutting device 7.
  • the remainder of the cast metal strand i.e. the area between the separation point 20 and the end 19 of the metal strand 4, also passes through the front section 8 of the rolling mill.
  • This section - hereinafter referred to as the remaining section 23 - is therefore located after the separation point 20.
  • the remaining section 23 can, as shown in FIG. 11, be rolled by the front section 8 of the rolling mill to an intermediate thickness d2 that is (at least partially) greater than the normal intermediate thickness d2N.
  • the increase to the larger intermediate thickness d2 - hereinafter referred to as the special intermediate thickness - can alternatively occur abruptly or in a ramp-like manner. It is even possible for the remaining section 23 to pass through the front section 8 of the rolling mill without rolling, i.e. continue to have the casting thickness d1.
  • the remaining section 23 comprises the last section 17 of the cast metal strand 4 explained above in connection with FIG. 2. It may also comprise a small section of the early section 18 of the cast metal strand 4. In any case, however, the distance a of the separation point 20 from the end 19 of the metal strand 4 (which is identical to the end of the last section 17 of the metal strand 4) is significantly smaller than the metallurgical length L, which is shown in FIG. 11 for comparison purposes.
  • the distance a is generally 50% of the metallurgical length L or less. For example, it may be 40% of the metallurgical length L or less. It is particularly preferred if the distance a is 30% of the metallurgical length L or less. The distance a may but not too small.
  • the distance a is 10% of the metallurgical length L or more.
  • it can be 15% of the metallurgical length L or more.
  • the distance a is 20% of the metallurgical length L or more.
  • a range between 20% and 30% of the metallurgical length L is therefore particularly preferred.
  • the strand guide 5 has a plurality of segments 24.
  • the segments 24 each have a plurality of rollers with which the segments 24 are positioned against the metal strand 4.
  • the number of roller pairs is usually in the upper single-digit or low double-digit range.
  • the clear width of the segments 24 can be adjusted using appropriate adjustment devices (usually hydraulic cylinder units, not shown).
  • the segments 24 are moved up a little while while the last section 17 of the metal strand 4 passes through the respective segment 24. Since the metal strand 4 is still quite soft, at least initially, the casting thickness d1 increases slightly. This causes the casting level 3 to sink slightly below the end 19 of the metal strand 4. This reliably prevents any still-molten metal from spilling out of the end 19 of the metal strand 4.
  • the last section 17 of the metal strand 4, at least after it has exited the continuous casting mold 2, can be cooled not only on its sides but also on its top side. This is indicated in FIG. 9 by the arrows labeled "H2O.” This allows the thickness of a forming cap 25 to be increased more quickly.
  • the combined casting and rolling mill is controlled by a control device (not shown).
  • the control device preferably comprises various models known to those skilled in the art. Using the models, the control device can initially determine—still during normal operation and possibly even before normal operation—the special withdrawal speed v2, the special cooling intensity K2, the further special cooling intensity K3, and the position of the separation point 20 on the metal strand 4. The position of the separation point 20 is generally determined indirectly by the distance a from the end 19 of the metal strand 4. The control device can make this determination, particularly taking into account the performance limits of the rolling mill and the changes in the metallurgical properties of the metal strip resulting from the reduction of the special withdrawal speed v2 compared to the normal withdrawal speed v1 and the change in the cooling of the cast metal strand 4.
  • the control device usually implements, among other things, a path tracking function. This allows the control device to determine the time at which the separation occurred at a time prior to the separation time using the path tracking function.
  • point 20 is located within the effective range of the isolating device 7.
  • the determination time can be any time between the time at which the control device becomes aware of the termination time t1 and the isolating time t5. From the determination of the isolating time t5, the control device, as far as the isolating device 7 is concerned, only needs to wait for the isolating time t5 and then control the isolating device 7 accordingly.
  • the present invention offers many advantages.
  • a significant reduction in rejects/scrap can be achieved, resulting in a significantly improved metal strip yield.
  • the operating method can easily be retrofitted to existing combined casting and rolling plants by appropriately adapting the control software.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne un équipement de coulée et de laminage combinés qui sont initialement actionnés en fonctionnement continu de manière connue, de sorte que l'équipement de coulée continue et le laminoir sont couplés l'un à l'autre par le brin métallique coulé (4). Elle concerne une opération spéciale qui commence lorsque le versement du métal liquide (1) dans le moule de coulée continue (2) est terminé. Le brin métallique (4) est ensuite encore tiré hors du moule de coulée continue (2), mais à une vitesse de retrait inférieure (v2) au moins au début de l'opération spéciale. En outre, une dernière partie (17) du brin métallique (4) qui, lors de la transition dans l'opération spéciale, est située dans le moule de coulée continue (2) et dans une région supérieure adjacente du guide de brin (5) est refroidie davantage dans le guide de brin (5). Une partie antérieure adjacente (18) du brin métallique (4) est refroidie comme précédemment ou légèrement moins. Le brin métallique (4) est coupé uniquement après le temps de terminaison (t1). Le temps de coupe (t5) est choisi de telle sorte que la partie restante (23) comprend la dernière partie (17), qui est davantage refroidie, et éventuellement une petite partie de la partie immédiatement précédente (18) du brin métallique (4). La totalité de la partie du brin métallique (4) située devant le point de coupe (20) est laminée pour former la bande métallique avec l'épaisseur de bande normale (d3N).
PCT/EP2025/051641 2024-03-05 2025-01-23 Équipement de coulée et de laminage combinés présentant une productivité améliorée Pending WO2025185877A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50190/2024A AT528176A1 (de) 2024-03-05 2024-03-05 Giesswalzverbundanlage mit verbesserter produktivität
ATA50190/2024 2024-03-05

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WO2025185877A1 true WO2025185877A1 (fr) 2025-09-12
WO2025185877A8 WO2025185877A8 (fr) 2025-10-02

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AT (1) AT528176A1 (fr)
WO (1) WO2025185877A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141207A1 (fr) 2008-05-20 2009-11-26 Siemens Vai Metals Technologies Gmbh & Co Procédé et installation de coulée continue pour la fabrication de brames épaisses
EP3000539A1 (fr) * 2014-09-24 2016-03-30 SMS group GmbH Procédé et installation de coulée-laminage destinés à couler et laminer un produit en coulée continue
WO2018082966A1 (fr) * 2016-11-03 2018-05-11 Primetals Technologies Austria GmbH Installation mixte de coulée-laminage et procédé de fabrication continue d'une bande finie laminée à chaud
EP3338914A1 (fr) * 2016-12-22 2018-06-27 Primetals Technologies Austria GmbH Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, procede de demarrage d'une installation combinee de coulee et de laminage et installation combinee de coulee et de laminage
EP3974072B1 (fr) * 2020-09-24 2023-07-19 Primetals Technologies Austria GmbH Installation combinée de coulée et de laminage et procédé de fonctionnement de l'installation combinée de coulée et de laminage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800004170A1 (it) * 2018-04-03 2019-10-03 Impianto di colata continua e laminazione per la produzione di prodotti metallurgici

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141207A1 (fr) 2008-05-20 2009-11-26 Siemens Vai Metals Technologies Gmbh & Co Procédé et installation de coulée continue pour la fabrication de brames épaisses
EP3000539A1 (fr) * 2014-09-24 2016-03-30 SMS group GmbH Procédé et installation de coulée-laminage destinés à couler et laminer un produit en coulée continue
WO2018082966A1 (fr) * 2016-11-03 2018-05-11 Primetals Technologies Austria GmbH Installation mixte de coulée-laminage et procédé de fabrication continue d'une bande finie laminée à chaud
EP3338914A1 (fr) * 2016-12-22 2018-06-27 Primetals Technologies Austria GmbH Procede de fabrication de bandes bobinees sans fin laminees a chaud dans une installation combinee de coulee et de laminage, procede de demarrage d'une installation combinee de coulee et de laminage et installation combinee de coulee et de laminage
EP3974072B1 (fr) * 2020-09-24 2023-07-19 Primetals Technologies Austria GmbH Installation combinée de coulée et de laminage et procédé de fonctionnement de l'installation combinée de coulée et de laminage

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WO2025185877A8 (fr) 2025-10-02

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