RU2156173C2 - Universal cold-rolling mill - Google Patents

Abstract

FIELD: designs of cold-rolling mills. SUBSTANCE: working stand of universal cold-rolling mill has supporting beams with mechanism of back-up roll balancing and axial fixing of four-high working rolls. Multiroll holder with turning holders may be installed instead of working rolls. Pressing device of working stand consists of electric motor connected with reducing gear and screw engageable via spherical axial bearing with hydraulic cylinder and linear displacement transducer. Working stand drive includes multispeed reduced and electric motors coaxially installed and connected by means of remote-controlled clutches. Universal cold-rolling mill is provided with winding machines mounted in, at least, two levels above and under rolling plane and having sets of changeable drums. Their drives are similar to working stand drive. Universal cold-rolling mill has flying divider - scissors, sheet handler and sheet piller. EFFECT: extended process potentialities of cold-rolling mills of monometals and polymetallic compositions, provided preparatory, finishing and cladding operations by sheet and/or coil process. 4 cl, 12 dwg

Description

 The invention relates to the field of metallurgical production, in particular to equipment for the production of strip products, as well as multilayer polymetallic compositions, and can be used to create new and reconstruct existing rolling mills, to develop technological processes for procuring and finishing rolling operations, as well as for the production of polymetals.

 Known reversible cold rolling mills (1) - (8): Quarto 1225 (Australian Jron and Steel Co), Quarto 1120 (Sohnes and Laughlin Steel Corp.), Duo 1500 (Forges de Guengron), Quarto 1425 (Stahlwerke Bochum), Quarto 1200 (Novolipetsk Metallurgical Plant) and others, containing in the technological sequence: an uncoiler with a loading device, left and right winding devices with unloading devices, a cage working two- or four-roll and a correctly pulling device. The equipment is mounted on one level. Known mills are made specialized, i.e. Designed to perform one technological operation - billet or finish rolling in a narrow range of thicknesses of the processed metal. In addition, well-known mills can work either in a roll or in a sheet process, a set of equipment does not allow to obtain sheets and strips of measured length.

 The closest in technical essence to the claimed invention is a cold strip cladding mill (9) selected as a prototype, comprising drive uncoilers of strip strips - bases and strip strips of clad components installed in the technological sequence, strip stripping device - basics, Quarto rolling mill "and a coiler of a clad strip with a drive, disc scissors and an edge coiler, wherein the uncoilers of the coils of clad strips are located in front of the rolling stand and equipped with agruzochno-storage devices, while rewinding device is a two-position, the first position is situated on the part of the winder, a removable drum, and the second - cantilevered expansible drum. The drives of unwinders, coilers, stands are made reversible. In addition to cladding, the mill can also finish rolling in the reverse mode according to the roll model.

The disadvantages of the prototype include:
- the inability to use to perform procurement operations;
- the inability to implement technological operations in sheet mode;
- a narrow range of thicknesses of rolled metal;
- the need to use additional equipment outside the mill line (control and rewinding units, transverse cutting units, etc.) to obtain finished products in the form of rolls or sheets;
- high energy intensity of the rolling process, due to the drive circuit of the mill stand and coilers;
- high capital costs necessary to create a complex of equipment that ensures the receipt of finished products.

 The aim of the invention is to expand the technological capabilities of the mill, which consists in expanding the ranges of thicknesses of the processed metals and their properties, and in realizing, with the same composition of the basic equipment, all technological operations of the rolling cycle from procurement to finishing, as well as reducing capital costs and energy saving.

 The basis of the invention is the task of expanding technological capabilities and reducing the energy intensity of cold rolling mills, which will allow, using one set of equipment of the cold rolling mill, to realize blanking, finishing rolling, tempering, plating and separation technological operations.

 To achieve this goal, the claimed invention contains the optimal composition of the equipment of the rolling mill and its placement relative to the working stand; a working stand suitable for blank roughing passes, finishing rolling, cladding and production of polymetals, training, rolling of thin and thin strips and tapes; flexibility in the selection of drive stands of the working stand, unwinders and winding devices that provide regulation in the required tension range with the installed power of electrical equipment selected from the rolling condition in the most intense power mode.

The solution of the tasks will allow in the line of one rolling mill to produce products obtained for:
- cold rolling blanking mills for rolled and sheet metal;
- Finishing mills for cold rolling of rolled and sheet metal;
- multi-roll mills for cold rolling of rolled and sheet metal;
- training mills;
- plating mills, mills for the production of polymetallic rolled and sheet metal;
- control and rewind and rewind units;
- units of longitudinal and transverse cutting.

In relation to the prototype of the claimed invention has the following distinctive features:
- unwinding and winding devices are placed in two and / or three levels;
- winding devices of the upper level are equipped with a set of double-support interchangeable drums and placed on both sides of the stand;
- winding devices of the lower level are made with cantilever drums and are located on both sides of the stand;
- Uncoilers are mounted in three levels;
- pulling rollers are tilted and equipped with pinch roller;
- a multi-roll straightening machine is equipped with an alligator-type opening mechanism;
- the cleaning machine is made with an offset cleaning tool;
- a volatile dividing device equipped with a measuring cut system is included in the mill equipment;
- the pressing device of the working stand is made combined with electromechanical units for coarse and hydraulic for fine tuning;
- the working stand is equipped with support beams designed for installation of a multi-roll cassette with mechanisms for axial movement of the intermediate rolls and balancing the work rolls, as well as mechanisms for balancing the support rolls of the Quarto system and axial fixing of the work rolls of the Quarto system and their anti-bending;
- drives of the working stand of winding and unwinding devices are made on the basis of multi-speed gearboxes with electric motors mounted coaxially and interconnected by remotely controlled couplers.

 The invention is new because it is not known from the modern information bank and has an inventive step, since the solution that is obvious to the specialist does not follow from existing design solutions.

 The invention is industrially applicable, since it can be used in metallurgical production for the production of roll and sheet blanks and finished products from mono- and polymetals by cold rolling methods sent to various industries.

The invention is disclosed in the accompanying drawings, where:
- in FIG. 1 and FIG. 2 shows a universal cold rolling mill, general view;
- in FIG. 3 - place I of FIG. 1: rolls of the Quarto system of the work stand;
- in FIG. 4 - place I of FIG. 1: multi-roll cassette of the working stand;
- in FIG. 5 is a section DD of FIG. 4: axial adjustment mechanism of the intermediate rolls of a multi-roll cassette;
- in FIG. 6 is a view A of FIG. 1: drive circuit of the press device of the working stand;
- in FIG. 7 is a section BB of FIG. 6: drive circuit of the press device of the working stand;
- in FIG. 8 is a section BB of FIG. 1: lower roll mounting mechanism;
- in FIG. 9 is a section G-D of FIG. 8: lower roll installation mechanism;
- in FIG. 10 is a diagram of a drive of work rolls of a work stand;
- in FIG. 11 is a diagram of a winding device drive;
- in FIG. 12 - place II of FIG. 1: multi roll straightening machine.

 A universal cold rolling mill comprises a lay-out device 1 of piece blanks 2 in the form of sheets, strips or cards, a feed roller 3, a loading device 4 rolls 5, an uncoiler 6 of a two cone type, an end bend of the strip 7 with a straight roller 8 and a pressure roller 9, pulling rollers 10, multi-roll straightening machine 11, stripping machine 12, centering rollers 13 - 16, setting wiring 17, guillotine shears 18 and 19, uncoilers 20 of the upper and 21 lower levels with two-leg removable drums 22, live roll 23, rotary live rolls 24 and 25, bending-pulling rollers 26 and 27 with pinch roller 28, work stand 29 with roller tables 30 and 31, thickness gauges 32, beater edge 33, lower level winders 34 and 35 with cantilever drums 36 and unloading devices 37, winding devices 38 and 39 of the upper level with a double support drum 40, movable wiring 41 and 42, removable live roll 43, live rolls 44, live roll of the cutting section 45, flying scissors 46 with rammer 47, mobile stop 48, stacker 49 , emphasis retractable 50, car with winding 51 and drive 52 rolls 53.

 The pressure device of the working stand 29 consists of an electric motor 54 connected to a gearbox 55 and a screw 56, which through a spherical thrust bearing 57 interacts with a hydraulic cylinder 58 connected to a linear displacement sensor 59.

 The support beams 60 are mounted in the middle part of the working stand 29, the cylinders 61 of the balancing mechanism of the support rolls 62 and the axial fixing device 63 of the pillows 64 of the work rolls 65 of the Quarto system are fixed on them. Work rolls 65, if necessary, can be replaced by a multi-roll cassette 66, including rotary cassettes 67, fixed by wedges 68 with a rack-and-pinion movement mechanism 69. Work rolls 70 of the multi-roll cassette 66 are balanced through levers 71 by hydraulic cylinders 72 mounted on the support beams 60. For axial moving and fixing the pillows 73 of the intermediate rolls 74 of the multi-roll cassette 66, mounted in the cups 75 on the bearings 76, is a drive consisting of a hydraulic motor 77, which is connected to a sensor via a gearbox 78 and a screw pair 79 m of axial displacement 80. Support rollers 81 with eccentric axes 82 are mounted on the stand of the working 29 symmetrically with respect to the rolling plane. In the lower part of the working stand 29, a mechanism is mounted for mounting the system work rolls 65 (Quarto) or work rolls 70 (multi-roll cassette) to a rolling level, including a drive motor 83 connected by a screw 84 to one of the pair of wedges 85 connected to each other by a rack and pinion mechanism synchronization 86 and wedge traverse 88, which rests on wedges 85, hydraulic jacks 87. The drive of the working stand 29 includes a multi-speed gearbox 89, electric motors 90, a coupler 91 with remote control, for example, from a hydraulic cylinder 92. Each of the drives winding devices 38 and 39 of the upper level, as well as 34 and 35 of the lower level, consist of a multi-speed gearbox 93, electric motors 94 and couplers 95 controlled by a power cylinder 96. A follower roller 97 is mounted on a rammer 47 and is electrically connected with flying shears 46.

 The multi-roll plate straightening machine 11 comprises a bed 98, by means of a hinge 99, a beam 100 connected to it, supported by a hydraulic cylinder 101 mounted on the bed 98.

 The universal cold rolling mill is intended for the implementation of technological processes for procurement rolling, finishing rolling, rolling of thin and thinnest tapes, training, cladding and production of multilayer polymetallic strips, as well as rewinding rolls, producing sheets and strips of measured length. Universal cold rolling mill works from a roll or sheet blank.

 Below, we consider the work of a universal cold rolling mill in the implementation of each of the claimed technological processes from various billets.

 1. The work of a universal cold rolling mill as a billet or finish rolling can be carried out from a roll or sheet billet.

 1.1. Work from a roll stock.

 In the modes of procurement or finishing rolling, the Quarto system rolls are heaped into the mill stand 29 of the universal mill. Before starting work, the working stand 29 is adjusted to the required thickness of the first pass, for which the upper work rolls 65 are set using an electromechanical pushing device: an electric motor 54 through gears 55 and screws 56, and the lower work rolls 65 - using a hydraulic motor 83, which, rotating screw 84 and moving the wedge 85 using the rack and pinion synchronization mechanism raise the wedge beam 88, the lifting of which is carried out by hydraulic jacks 87, with the lower work rolls 65 installed on it.

 Rolls 5, obtained, for example, from a continuous casting line or a hot rolling mill, are fed one by one from a loading device 4 to a two-cone type unwinder 6 and are fixed on it. With the help of a strip end bender 7, the front end of the strip is separated from the roll 5 and due to the rotation of the roll 5 by the unwinder 6 is transmitted through the correct roller 8, which carries out its preliminary editing, to the pulling rollers 10, the pressure roller 9 is pressed against the roll 5 at this time, preventing it fluffing. After the strip is captured by the pulling rollers 10, the latter transfer it to the open multi-roll straightening machine 11, which, after closing, carries out the straightening of the rolled curvature. Then the strip is centered by the centering rollers 14, the defective part of the strip is cut off by guillotine shears 18 and the strip through the setting wiring 17, the feed roller 23, the rolling roller 24 and the bending-pulling rollers 26 are defined by the roller table 30 into the work stand 29.

 When leaving the cage of the working 29, the strip enters the target of the bending-pulling rollers 27 and further, moving along the rotary roller table 25, which lifts to the upper position and transfers the upper level winding device 39 into the slot of the double-support drum 40. The drive of the working stand 29 is turned on. 2-3 coils of the strip are wound onto the drum 40, which ensures the necessary tension, and the rotary rolling table 25 is returned to the horizontal position. Carry out rolling. After the rear end of the strip held by the bending-pulling rollers 27 leaves the working stand 29, the drives of the working stand 29 and the bending-pulling rollers 27 are reversed, and the strip is fed to the working stand 29 with its rear end, and then the bending-pulling rollers 26 are turned the live roll 24, located in the upper position, is set in the slot of the drum 40 of the winding device 38 of the upper level. Reversible blank rolling is performed according to the scheme: winding device 39 of the upper level - cage working 29 - winding device 38 of the upper level, etc. until the specified metal thickness is reached. The solution between the work rolls 65 is set for each pass using an electromechanical push device.

 When finishing rolling the roll strip, in addition to the electromechanical setting, the work rolls 65 also use a hydraulic pressure device, including a hydraulic cylinder 58, which interacts with the screw 56 through a spherical thrust bearing 57 and a linear displacement sensor 59, which allows the use of an automated system for adjusting the thickness of the metal by passes. When finishing rolling, winding devices 34 and 35 of the lower level with cantilever drums 37 are used, and the task of the strip in their pharynx is carried out, respectively, by the rotating roller tables 24 and 25, which are in the lowest position. Pinch rollers 28 of the bending pulleys 26 and 27 are used to reduce the roll curvature of the rear end of the strip in the roll. Reverse rolling is carried out according to the scheme: winding device 35 of the lower level - cage working 29 - winding device 34 of the lower level - cage working 29, etc., until the specified thickness is reached.

 Depending on the number of passes, the rolled roll is removed by the unloading device 37 from the cantilever drum 36 of the winding device 34 or 35.

 Finished cold rolling according to the above scheme can be carried out when loading the original roll onto the drum 40 of one of the winding devices 38 or 39 of the upper level.

 1.2. Work from a strip blank.

 Piece blanks 2 in the form of strips, sheets or cards, hot rolled or cast, milled by the distributor 1 are fed one at a time to the feed roller 3, and then through the removable rolling table 43 and the centering rollers 13 by the pulling rollers 10 they are set into the opened multi-roll straightening machine 11, where after the information the rolls, the strip is straightened, centered by the rollers 14 and, through the open stripping machine 12 and the guillotine shears 18, is set along the roller tables 23 and 24 into the target of the bending-pulling rollers 26, which define the front end of the piece blank 2 in the work stand 29, worker which rolls 65 are tuned to the thickness of the passage. The back tension of the strip during rolling is created by the roller table 30. The strip 2 emerging from the cage is placed on the roller tables 25 and 44, and its rear end is held by the roller table 31. Then, the work rolls 65 of the cage of the working 29 are adjusted to the thickness of the next passage, the cage of the working one is reversed and carried out next pass. The process is repeated until the required thickness is reached, and then the strip is bent by pulling rollers 27 along the roller tables 44 until the stop of the movable 48, set to the required measured length, includes flying scissors 46 (in stationary mode) for cutting, the emphasis of the movable 48 and the cut measuring strip are raised pass through the rolling table of the cutting section 45 until the stop of the retractable 50, where they stop. The stacker 49 stacks the cut measuring strips in the feet. The rammer 47 is used when cutting short strips, as well as for dumping the substandard rear ends of the strips.

 1.3. Work with a combined roll-strip process.

 The operation of the universal mill during the combined rolling process is carried out similarly to work from a strip billet (Section 1.2.) Until the required strip thickness is reached, which then, when the stop is removed using a movable 48 and retractable 50 through open flying scissors 46, is set into a rolling machine 51, where it is rolled up 53 and transferred to the drive 52. If necessary, the strip can be rewound by a top-level winder 38 or a lower level winder 34.

 1.4. The work of the universal mill during the finishing rolling of thin and thinnest strips.

 Instead of work rolls 65 of the Quarto system, a multi-roll cassette 66 containing rotary cassettes 67, which are fixed by wedges 68 with a rack-and-pinion movement mechanism 69 placed on the support beams 60, is poured into the work stand 29, instead of work rolls 65. The roll gap and the selection of all backlashes are carried out by hydraulic cylinders 72 mounted supporting beams 60 and interacting with the work rolls 70 through the levers 71, as well as turning the eccentric axes 82. The lower work roll 70 of the multi-roll cassette 66 is set to the rolling level by the same mechanism, as the lower work roll of the Quarto system (paragraph 1.1). Axial movement to adjust the strip profile and fixation of the pillows 73 of the intermediate rolls 74 of the multi-roll cassette 66 is carried out by a drive including a hydraulic motor 77, a gearbox 78, a screw pair 79 and an axial displacement sensor 80 kinematically connected to it.

 Loading rolls, transferring the front end of the strip to the working stand 29, its task in the winding device 35 of the lower level is carried out similarly to finishing rolling (paragraph 1.1). Rolling is carried out according to the scheme: a lower level winding device 35 - a work stand 29 - winding device 34. The thickness of the strip in each pass is controlled by thickness gauges 32. Rolls are removed depending on the number of passes from the lower level winder 34 or 35 using an unloading device 37.

1.5. The work of a universal cold rolling mill as a training
Work stand 29, using pressure devices, is adjusted to a compression ratio of 1-2%. Depending on the thickness of the tackle, training is carried out using winders 34 and 36 of the lower level or 38 and 39 of the upper level.

2. The work of a universal cold rolling mill as a plating, as well as a mill for the manufacture of multilayer polymetallic compositions
Let us consider the operation of a universal mill as a plating by the example of the production of a trimetallic strip consisting of a base (middle layer) and clad components (extreme layers).

 Setting up the working stand 29, loading the rolls 5 of the base strip and transferring its front end to the stripping machine 12, which is pre-adjusted to the thickness of the base strip, and then to the bending-pulling rollers 26, where they are stopped, are carried out in the sequence described in paragraph 1.1. Rolls of strips of cladding components wound on double-support removable drums 22 are loaded into uncoilers 20 of the upper level and 21 of the lower level. The front ends of the strips of cladding components are fed to the open bending-pulling rollers 26 so that the front end of the strip of the upper cladding component is aligned with the front end of the base strip, and the front end of the strip of the lower cladding component protrudes beyond the front ends of the other two strips. The bending-pulling rollers 26 are closed by clamping the strips, with the movement of the pinch roller 28 the front protruding end of the lower cladding component is bent around the front ends of the base strip and the strips of the upper cladding component, and then all three strips are fed by the bending-pulling rollers 26 into the working cage 29, where they are compressed by 60-80% per pass. Next, the strip is directed to the target of the bending-pulling rollers 27, which, by means of the pinch roller 28 and the live roll of the rotary 25 with movable wiring 42, define the front end of the trimetallic strip in the mouth of the cantilever drum 36 of the lower level winding device 35. The edges of the strips of the cladding components of the upper and lower ones separated from the trimetallic strip are wound with an edge coiler 33 into the waste bay. A wound roll of a trimetallic strip from the winding device 35 is removed by the unloading device 37.

 The work of the universal cold rolling mill in the manufacture of compositions with a different number of layers is carried out similarly, while for the supply of components, winding devices 36 of the lower level and 38 of the upper level are also used as unwinders.

3. The work of the universal cold rolling mill as rewind
Rewinding the strip into rolls with reduced tension is carried out using lower-level winding devices 35 and 34 with cantilever drums 36. When rewinding, work rolls 65 or 70 of work stand 29 are bred to a gap exceeding the thickness of the rewinding strip, and the drive of the winding device acting as an unwinder adjust to the minimum amount of tension.

4. The operation of the universal cold rolling mill in the mode of transverse cutting of strips into sheets
The initial roll, depending on the thickness of the strip and the previous technological operation, is loaded onto one of the unwinding devices: 4 or 20, or 21, or 38, or 34. The front end of the strip is led to the bending-pulling rollers 27 through the open working stand 29. Pinch the roller 28 of the bending-pulling rollers 27 and the rotary rolling table 25 are installed in a horizontal position and, turning on the drive of the bending-pulling rollers 27 at a working speed, they begin to transport the strip along the live rolls 44 through the open guillotine shears 19 and centering rollers 15 and 16. A follower roller 97 rolling along the strip, electrically connected with the drive of the flying scissors 46, ensures their synchronization with the speed of the strip, and also gives a command to carry out the working stroke and cut a sheet of measured length, which is fed to the roller table of the cutting section 45. C the rolling table of the cutting section 45, the cut sheets of measured length are removed by the stacker 49 and stacked in feet.

 Depending on the workload, the drives of the stand of the working 29 and / or winding devices 34, 35, 38, 39 can operate with two, three or four electric motors turned on, 90 and 94, respectively.

 As follows from the description of the work of the present invention - a universal cold rolling mill, the latter allows a number of the above technological operations to be performed on one set of equipment with optimal energy consumption and minimal loss of time for transitions between operations, which is ensured by the following technical solutions: a special set and placement of technological equipment, constructive the execution of individual machines and the choice of flexible drive circuits for the working stand and winding devices.

Claims (3)

 1. A universal cold rolling mill for ferrous and non-ferrous metals, designed to perform harvesting, finishing rolling, training and cladding operations, containing strip unwinders with loading-storage and driving devices in three levels installed in a technological sequence, a multi-roll straightening machine, strippers, scissors for trimming the ends of strips, reversible working stand with interchangeable roll unit and electromechanical screw pressing device, reversible bar Sauna winding devices, transporting and packaging devices, characterized in that it is equipped with tiltable drive bending-pulling rollers mounted in the middle part of the work stand with support beams with means for securing the multi-roll cassette and the mechanism of axial movement of the intermediate rolls, made, for example, based on a screw mechanism , means of balancing the upper working and supporting and / or anti-bending work rolls, the pressing device of the working stand is equipped with hydraulic units t The settings, interacting with the screws through the floating bearings, the drives of the working stand and winding devices are made on the basis of a multi-speed gearbox and connected by couplings with remote control with it and / or between themselves, mounted coaxially with electric motors, and the winding devices are mounted in at least , two levels above and below the rolling plane and equipped with sets of interchangeable drums, made with the possibility of winding types of tackle, specified by technological operations.  2. The universal cold rolling mill according to claim 1, characterized in that the multi-roll straightening machine is equipped with an alligator-type opening mechanism.  3. The universal cold rolling mill according to claim 1, characterized in that it is equipped with a volatile dividing device, for example, scissors, mounted in front of the baling device, and is equipped with a system for monitoring the length of the rental when cutting.

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