Multifunctional rolling equipment and method based on pre-pressing bite-in mechanism

Abstract

The invention belongs to the field of metal composite plate rolling, and particularly relates to multifunctional rolling equipment and method based on a pre-pressing bite-in mechanism. The multifunctional rolling equipment comprises a first roller conveyor, a friction feeder, a rolling unit, a roller type straightening machine and a second roller conveyor which are sequentially arranged on the same axis; the friction feeder comprises a feeding rack, two lower roller mounting plates are symmetrically arranged on the upper surface of the feeding rack, a plurality of lower friction rollers are rotationally arranged between the two lower roller mounting plates, upper friction rollers are arranged above the lower friction rollers, and the upper friction rollers are rotationally mounted on upper roller mounting plates. Sufficient friction force is provided for the metal composite board through the lower friction roller and the upper friction roller, and the problem that the metal composite board is difficult to automatically bite is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal composite plate rolling, and in particular relates to a multifunctional rolling device and method based on a pre-pressing bite mechanism. Background Art

[0002] With the rapid development of industries such as aerospace, electronic technology, petrochemicals, rail transportation, and marine engineering, and the advancement of major national scientific and technological projects such as lightweight and green key equipment, a single metal or alloy is difficult to meet the requirements for comprehensive material performance. Therefore, metal composite plates with the characteristics of two or more metals have become a hot topic of research in recent years.

[0003] The main methods for preparing metal composite plates include rolling, extrusion, explosion welding, and diffusion welding. Rolling is one of the most widely used preparation methods. Compared with other methods, rolling has the advantages of low pollution, stable operation, and good batch production continuity.

[0004] However, during the rolling process of metal composite plates, due to the differences in the base and cladding materials, there is a significant deformation inconsistency. The metal composite plates suffer from severe warping during and after forming, resulting in poor macroscopic plate quality and making automated continuous rolling difficult.

[0005] Therefore, problems such as difficulty in automatically biting the plate before rolling and severe plate warping after rolling remain pressing challenges for the rolling-compound method. Solving these issues and achieving integrated feeding, rolling, and straightening, while achieving high efficiency and short process steps, will have far-reaching implications for accelerating industrial application in my country. Summary of the Invention

[0006] In view of the above problems, the present invention provides a multifunctional rolling equipment and method based on a pre-pressing bite mechanism.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: Multifunctional rolling equipment based on pre-pressing and biting mechanism, including No. 1 roller conveyor, friction feeder, rolling mill, roller straightening machine and No. 2 roller conveyor arranged in sequence on the same axis; The friction feeder includes a feeding frame, two lower roller mounting plates are symmetrically arranged on the upper surface of the feeding frame, a plurality of lower friction rollers are rotatably arranged between the two lower roller mounting plates, one end of the lower friction roller passes through the lower roller mounting plate and is fixedly connected to a transmission sprocket, a plurality of the transmission sprockets are connected by chain transmission, a driven sprocket is also fixedly mounted on one of the lower friction rollers, the driven sprocket is connected to the driving sprocket by chain transmission, the driving sprocket is fixedly mounted on the output shaft of the feeding motor, and the feeding motor is fixedly mounted on the feeding In the frame, an upper friction roller is arranged above the lower friction roller, and multiple upper friction rollers are rotatably mounted on the upper roller mounting plate. A guide frame is also symmetrically arranged on the upper surface of the feeding frame, and the upper roller mounting plate is slidably connected to the guide frame. A plurality of dampers are fixedly arranged on the upper surface of the upper roller mounting plate, and the other end of the damper is fixedly connected to the lower surface of the adjustment plate. The adjustment plate is slidably mounted on the guide frame, and a plurality of hydraulic telescopic rods are fixedly connected to the upper surface of the adjustment plate, and the other end of the hydraulic telescopic rod is fixedly connected to the upper end of the guide frame.

[0008] Furthermore, the rolling mill group includes a rolling mill frame, on which an upper working roll and a lower working roll are installed. The upper working roll and the lower working roll are respectively connected to the upper output shaft and the lower output shaft of the gear box through a coupling. The input shaft of the gear box is connected to the output shaft of the rolling mill motor through a coupling. A pressing device is installed on the upper part of the rolling mill frame to realize control of the pressing amount of the rolling mill group, and a main drive sprocket is provided at the other end of the lower working roll.

[0009] Furthermore, the roller straightening machine includes a straightening frame, a plurality of lower straightening rollers are rotatably mounted on the straightening frame, an upper straightening roller is provided above the lower straightening roller, the upper straightening roller is rotatably mounted on an adjustment plate, the adjustment plate is slidably mounted on the straightening frame, a hydraulic cylinder is mounted on the upper end of the straightening frame, the piston rod of the hydraulic cylinder passes through the straightening frame and is fixedly connected to the upper surface of the adjustment plate, one end of the lower straightening roller passes through the straightening frame and is fixedly connected to a transmission gear, an intermediate gear is meshed and connected between adjacent transmission gears, the intermediate gear is rotatably mounted on the straightening frame, and a driven sprocket is fixedly connected to the end face of one of the transmission gears, and the driven sprocket is connected to the main drive sprocket through a chain drive.

[0010] Furthermore, the surfaces of the lower friction roller and the upper friction roller are both provided with knurling, and the knurling is straight, oblique or mesh.

[0011] Furthermore, the roller tops of the No. 1 roller conveyor, the lower friction roller and the No. 2 roller conveyor are located at the same height, the roller tops of the lower working roller and the lower straight roller are located at the same height, and the roller top height of the lower working roller is higher than the roller top height of the lower friction roller.

[0012] Furthermore, the linear speeds of the lower working roll and the lower friction roll are the same, and the linear speed of the lower straight roll is greater than the linear speed of the lower working roll.

[0013] Furthermore, the damper provides a pressure of 10-40 MPa to the plate.

[0014] Furthermore, the size of the gap between the upper working roll and the lower working roll is the same as the size of the gap between the upper straightening roll and the lower straightening roll.

[0015] A rolling method, comprising rolling a single metal plate, rolling a metal composite thin plate, and rolling a metal composite thick plate; The single metal plate rolling is to lift the upper friction roller in the friction feeder and the upper straight roller in the roller straightening machine, and convey the single metal plate to be rolled to the rolling mill group through the No. 1 roller conveyor and the lower friction roller for rolling, and after rolling is completed, it is sent out by the lower straight roller and the No. 2 roller conveyor; The metal composite sheet rolling is performed by lifting the upper friction roller in the friction feeder, and conveying the composite billet to be rolled to the rolling mill group through the No. 1 roller conveyor and the lower friction roller for rolling. After rolling, the composite billet is straightened by the roller straightening machine, and the straightened metal composite sheet is sent out by the No. 2 roller conveyor; The metal composite thick plate rolling is to convey the composite billet to be rolled to the friction feeder through the No. 1 roller conveyor, and convey the composite billet to be rolled to the rolling mill group for rolling through the friction force of the friction feeder, so as to realize the automatic bite of the rolling mill group. After the rolling is completed, it is straightened by the roller straightening machine, and the straightened metal composite thick plate is sent out by the No. 2 roller conveyor.

[0016] Furthermore, the metal composite thin plate is a composite plate with a thickness of less than 20 mm, and the metal composite thick plate is a composite plate with a thickness greater than or equal to 20 mm; the metal composite thin plate and the metal composite thick plate are any one of a copper / aluminum composite plate, a steel / aluminum composite plate, a magnesium / aluminum composite plate, a titanium / steel composite plate or a stainless steel / carbon steel composite plate, the rolling mill group is any one of a two-roll mill, a four-roll mill or a six-roll mill, and the rolling mode of the rolling mill group is any one of the same diameter and same speed, different diameters and same speed, and same diameter and different speed.

[0017] Compared with the prior art, the present invention has the following advantages: The invention can flexibly adjust the roller gap size of the friction feeder through the cooperation of the hydraulic telescopic rod and the damper. The knurling on the surface of the upper friction roller and the lower friction roller provides sufficient friction for the metal composite plate, solving the problem of the difficulty of automatic biting of the metal composite plate.

[0018] The present invention can adaptively and flexibly adjust the roller gap size of the friction feeder according to the different thicknesses of metal composite plates through the cooperation of the hydraulic telescopic rod and the damper; at the same time, facing different metal composite plates, the present invention can use knurling of different densities or shapes to apply friction forces adapted to different metal composite plates to the upper friction roller and the lower friction roller, thereby solving the problem of difficulty in automatic biting of metal composite plates.

[0019] The lower friction roller and the lower straight roller of the present invention are both active rollers, and the upper friction roller and the upper straight roller are both passive rollers, ensuring good interface bonding between the base layer and the multilayer of the metal composite plate.

[0020] The present invention achieves integrated production of friction feeding, rolling, and roller straightening for metal composite sheets. The friction feeder precisely feeds the sheets, enabling automatic engagement of the rolling mill. After rolling on the rolling mill, the sheets can be directly straightened on the roller straightener. This method effectively reduces warping, concave warping, convex warping, and tail warping of the sheets after rolling, even for different metal composite sheet materials, at different roller speeds, and at different reduction ratios. Under the same rolling conditions, the curvature of magnesium / aluminum composite sheets is reduced from 7.25% to 0.91%, that of stainless steel / carbon steel composite sheets from 14.90% to 9.83%, and that of steel / aluminum-steel composite sheets from 1.33% to 0.26%. This improves the yield rate of the metal composite sheets, facilitates subsequent processing of the metal composite sheets, and achieves highly efficient, streamlined automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the friction feeder of the present invention; Figure 3 It is a structural schematic diagram of the rolling mill group of the present invention; Figure 4 It is a structural schematic diagram of the roller straightening machine of the present invention; Figure 5 For the present invention Figure 4 A partial enlarged view of the middle circle A; Figure 6 is a schematic diagram of a metal composite plate obtained without using the present invention; Figure 7 A schematic diagram of a metal composite plate obtained by using the present invention; In the figure, roller conveyor No. 1, friction feeder 2, rolling mill group 3, roller straightening machine 4, roller conveyor No. 2 5, feeder frame 201, lower roller mounting plate 202, lower friction roller 203, transmission sprocket 204, driven sprocket 205, driving sprocket 206, feeding motor 207, upper friction roller 208, upper roller mounting plate 209, guide frame 210, damper 211, adjustment plate 212, hydraulic telescopic rod 213, rolling mill frame 301, upper working roller 302, lower working roller 303, gear box 304, rolling mill motor 305, pressing device 306, main drive sprocket 307, straightening frame 401, lower straightening roller 402, upper straightening roller 403, adjustment plate 404, hydraulic cylinder 405, transmission gear 406, intermediate gear 407, and driven sprocket 408. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical solution of the present invention, the present invention is further described below through examples.

[0023] like Figures 1 to 5 As shown, the multifunctional rolling equipment based on the pre-pressing bite mechanism includes a No. 1 roller conveyor 1, a friction feeder 2, a rolling mill group 3, a roller straightening machine 4 and a No. 2 roller conveyor 5 which are sequentially arranged on the same axis; The friction feeder 2 includes a feeding frame 201, and two lower roller mounting plates 202 are symmetrically arranged on the upper surface of the feeding frame 201, and a plurality of lower friction rollers 203 are rotatably arranged between the two lower roller mounting plates 202, one end of the lower friction roller 203 passes through the lower roller mounting plate 202 and is fixedly connected to a transmission sprocket 204, and a plurality of the transmission sprockets 204 are connected by chain transmission, and a driven sprocket 205 is also fixedly mounted on one of the lower friction rollers 203, and the driven sprocket 205 is connected to the driving sprocket 206 by chain transmission, and the driving sprocket 206 is fixedly mounted on the output shaft of the feeding motor 207, and the feeding motor 207 is fixedly mounted in the feeding frame 201, and an upper friction roller 208 is arranged above the lower friction roller 203, and a plurality of the upper friction rollers 208 all rotate The friction feeder 2 is dynamically mounted on an upper roller mounting plate 209. A guide frame 210 is symmetrically mounted on the upper surface of the feeder frame 201. The upper roller mounting plate 209 is slidably connected to the guide frame 210. Several dampers 211 are fixedly mounted on the upper surface of the upper roller mounting plate 209. The other ends of the dampers 211 are fixedly connected to the lower surface of an adjustment plate 212. The adjustment plate 212 is slidably mounted on the guide frame 210. The dampers 211 apply a pressure of 10-40 MPa to the sheet. The hydraulic telescopic rods 213 cooperate with the dampers 211 to flexibly adjust the roller gap of the friction feeder 2 according to the thickness of the metal composite sheet. Multiple hydraulic telescopic rods 213 are fixedly connected to the upper surface of the adjustment plate 212. The other ends of the hydraulic telescopic rods 213 are fixedly connected to the upper end of the guide frame 210. The surfaces of the lower friction roller 203 and the upper friction roller 208 are both knurled, with the knurling being straight, twill, or reticulated.

[0024] The rolling mill group 3 includes a rolling mill frame 301, on which an upper working roll 302 and a lower working roll 303 are installed. The upper working roll 302 and the lower working roll 303 are respectively connected to the upper output shaft and the lower output shaft of the gear box 304 through a coupling. The input shaft of the gear box 304 is connected to the output shaft of the rolling mill motor 305 through a coupling. A pressing device 306 is installed on the upper part of the rolling mill frame 301 to control the pressing amount of the rolling mill group 3. A main drive sprocket 307 is provided at the other end of the lower working roll 303.

[0025] The roller straightening machine 4 includes a straightening frame 401, on which a plurality of lower straightening rollers 402 are rotatably mounted, and an upper straightening roller 403 is provided above the lower straightening rollers 402, and the upper straightening rollers 403 are rotatably mounted on an adjustment plate 404, and the adjustment plate 404 is slidably mounted on the straightening frame 401, and a hydraulic cylinder 405 is mounted on the upper end of the straightening frame 401, and the piston rod of the hydraulic cylinder 405 passes through the straightening frame 401 and is fixedly connected to the upper surface of the adjustment plate 404, and one end of the lower straightening roller 402 passes through the straightening frame 401 and is fixedly connected to a transmission gear 406, and an intermediate gear 407 is meshed and connected between adjacent transmission gears 406, and the intermediate gear 407 is rotatably mounted on the straightening frame 401, and a driven sprocket 408 is fixedly connected to the end face of one of the transmission gears 406, and the driven sprocket 408 is transmission-connected to the main drive sprocket 307 by chain drive.

[0026] The roller tops of the No. 1 roller conveyor 1, the lower friction roller 203 and the No. 2 roller conveyor 5 are located at the same height, the roller tops of the lower working roller 303 and the lower straight roller 402 are located at the same height, the roller top height of the lower working roller 303 is higher than the roller top height of the lower friction roller 203, the linear speed of the lower working roller 303 is the same as that of the lower friction roller 203, the linear speed of the lower straight roller 402 is greater than that of the lower working roller 303, and the size of the gap between the upper working roller 302 and the lower working roller 303 is the same as the size of the gap between the upper straight roller 403 and the lower straight roller 402.

[0027] A rolling method, comprising rolling a single metal plate, rolling a metal composite thin plate, and rolling a metal composite thick plate; the metal composite thin plate is a composite plate having a thickness of less than 20 mm, and the metal composite thick plate is a composite plate having a thickness of greater than or equal to 20 mm; the metal composite thin plate and the metal composite thick plate are any one of a copper / aluminum composite plate, a steel / aluminum composite plate, a magnesium / aluminum composite plate, a titanium / steel composite plate, or a stainless steel / carbon steel composite plate; the rolling mill group 3 is any one of a two-roll mill, a four-roll mill, or a six-roll mill; and the rolling mode of the rolling mill group 3 is any one of same diameter and same speed, different diameters and same speed, or same diameter and different speed; The single metal plate rolling is to lift the upper friction roller 208 in the friction feeder 2 and the upper straightening roller 403 in the roller straightening machine 4, and convey the single metal plate to be rolled to the rolling mill group 3 through the No. 1 roller conveyor 1 and the lower friction roller 203 for rolling. After rolling is completed, it is sent out by the lower straightening roller 402 and the No. 2 roller conveyor 5; The metal composite sheet rolling is performed by lifting the upper friction roller 208 in the friction feeder 2, and conveying the composite sheet to be rolled to the rolling mill group 3 through the No. 1 roller conveyor 1 and the lower friction roller 203 for rolling. After rolling, the composite sheet is straightened by the roller straightening machine 4, and the straightened metal composite sheet is sent out by the No. 2 roller conveyor 5; The metal composite thick plate rolling is as follows: the composite billet to be rolled is conveyed to the friction feeder 2 by the No. 1 roller conveyor 1, and the composite billet to be rolled is conveyed to the rolling mill group 3 for rolling by the friction force of the friction feeder 2, so as to realize the automatic bite of the rolling mill group 3. After the rolling is completed, it is straightened by the roller straightening machine 4, and the straightened metal composite thick plate is sent out by the No. 2 roller conveyor 5.

[0028] The foregoing shows and describes the principal features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be embraced therein.

[0029] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Multifunctional rolling equipment based on pre-pressing and biting mechanism, characterized by: It comprises a No. 1 roller conveyor (1), a friction feeder (2), a rolling mill group (3), a roller straightening machine (4) and a No. 2 roller conveyor (5) which are sequentially arranged on the same axis; The friction feeder (2) comprises a feeder frame (201), two lower roller mounting plates (202) are symmetrically arranged on the upper surface of the feeder frame (201), a plurality of lower friction rollers (203) are rotatably arranged between the two lower roller mounting plates (202), one end of the lower friction roller (203) passes through the lower roller mounting plate (202) and is fixedly connected to a transmission sprocket (204), the plurality of transmission sprockets (204) are connected by chain transmission, a driven sprocket (205) is also fixedly mounted on one of the lower friction rollers (203), the driven sprocket (205) is connected to a driving sprocket (206) by chain transmission, the driving sprocket (206) is fixedly mounted on the output shaft of a feeder motor (207), and the feeder motor (207) is fixedly mounted on the feeder frame (201). ), an upper friction roller (208) is provided above the lower friction roller (203), and a plurality of the upper friction rollers (208) are rotatably mounted on an upper roller mounting plate (209). A guide frame (210) is symmetrically provided on the upper surface of the feeder frame (201), and the upper roller mounting plate (209) is slidably connected to the guide frame (210). A plurality of dampers (211) are fixedly provided on the upper surface of the upper roller mounting plate (209), and the other end of the damper (211) is fixedly connected to the lower surface of the adjustment plate (212). The adjustment plate (212) is slidably mounted on the guide frame (210). A plurality of hydraulic telescopic rods (213) are fixedly connected to the upper surface of the adjustment plate (212), and the other end of the hydraulic telescopic rod (213) is fixedly connected to the upper end of the guide frame (210).

2. The multifunctional rolling equipment based on the pre-pressing bite mechanism according to claim 1 is characterized in that: The rolling mill group (3) includes a rolling mill frame (301), an upper working roll (302) and a lower working roll (303) are installed on the rolling mill frame (301), the upper working roll (302) and the lower working roll (303) are respectively connected to the upper output shaft and the lower output shaft of the gear box (304) through a coupling, the input shaft of the gear box (304) is connected to the output shaft of the rolling mill motor (305) through a coupling, a pressing device (306) is installed on the upper part of the rolling mill frame (301) to realize the control of the pressing amount of the rolling mill group (3), and a main driving sprocket (307) is provided at the other end of the lower working roll (303).

3. The multifunctional rolling equipment based on the pre-pressing bite mechanism according to claim 2 is characterized in that: The roller straightening machine (4) comprises a straightening frame (401), a plurality of lower straightening rollers (402) are rotatably mounted on the straightening frame (401), an upper straightening roller (403) is provided above the lower straightening rollers (402), the upper straightening rollers (403) are rotatably mounted on an adjustment plate (404), the adjustment plate (404) is slidably mounted on the straightening frame (401), a hydraulic cylinder (405) is mounted on the upper end of the straightening frame (401), a piston rod of the hydraulic cylinder (405) passes through the straightening frame (401), and the upper end of the hydraulic cylinder (405) is provided with a hydraulic cylinder (405). ) is fixedly connected to the upper surface of the adjustment plate (404), one end of the lower straight roller (402) passes through the straightening frame (401) and is fixedly connected to a transmission gear (406), and an intermediate gear (407) is meshed and connected between adjacent transmission gears (406), and the intermediate gear (407) is rotatably mounted on the straightening frame (401), and a driven sprocket (408) is fixedly connected to the end face of one of the transmission gears (406), and the driven sprocket (408) is transmission-connected to the main drive sprocket (307) by chain transmission.

4. The multifunctional rolling equipment based on the pre-pressing and biting mechanism according to claim 1 is characterized in that: The surfaces of the lower friction roller (203) and the upper friction roller (208) are both provided with knurling, and the knurling is straight, oblique or mesh.

5. The multifunctional rolling equipment based on the pre-pressing bite mechanism according to claim 3 is characterized in that: The roller tops of the No. 1 roller conveyor (1), the lower friction roller (203) and the No. 2 roller conveyor (5) are located at the same height, the roller tops of the lower working roller (303) and the lower straight roller (402) are located at the same height, and the roller top height of the lower working roller (303) is higher than the roller top height of the lower friction roller (203).

6. The multifunctional rolling equipment based on the pre-pressing bite mechanism according to claim 3 is characterized in that: The linear speed of the lower working roller (303) is the same as that of the lower friction roller (203), and the linear speed of the lower straight roller (402) is greater than the linear speed of the lower working roller (303).

7. The multifunctional rolling equipment based on the pre-pressing bite mechanism according to claim 1 is characterized in that: The damper (211) provides a pressure of 10-40 MPa to the plate.

8. The multifunctional rolling equipment based on the pre-pressing and biting mechanism according to claim 3 is characterized in that: The size of the gap between the upper working roller (302) and the lower working roller (303) is the same as the size of the gap between the upper straight roller (403) and the lower straight roller (402).

9. A rolling method using the multifunctional rolling equipment based on the pre-pressing and biting mechanism according to claim 3, characterized in that: Including single metal plate rolling, metal composite thin plate rolling and metal composite thick plate rolling; The single metal plate rolling is performed by lifting the upper friction roller (208) in the friction feeder (2) and the upper straightening roller (403) in the roller straightening machine (4), and conveying the single metal plate to be rolled to the rolling mill group (3) through the No. 1 roller conveyor (1) and the lower friction roller (203) for rolling. After the rolling is completed, the single metal plate is sent out by the lower straightening roller (402) and the No. 2 roller conveyor (5); The metal composite sheet rolling is performed by lifting the upper friction roller (208) in the friction feeder (2), conveying the composite billet to be rolled to the rolling mill group (3) through the No. 1 roller conveyor (1) and the lower friction roller (203) for rolling, and straightening the metal composite sheet after rolling through the roller straightening machine (4). The straightened metal composite sheet is sent out by the No. 2 roller conveyor (5); The metal composite thick plate rolling is as follows: the composite blank to be rolled is conveyed to the friction feeder (2) by the first roller conveyor (1); the composite blank to be rolled is conveyed to the rolling mill group (3) for rolling by the friction force of the friction feeder (2); the rolling mill group (3) is automatically engaged; after rolling is completed, the composite blank is straightened by the roller straightening machine (4); and the straightened metal composite thick plate is sent out by the second roller conveyor (5).

10. A rolling method according to claim 9, characterized in that: The metal composite thin plate is a composite plate with a thickness of less than 20 mm, and the metal composite thick plate is a composite plate with a thickness of greater than or equal to 20 mm; the metal composite thin plate and the metal composite thick plate are any one of a copper / aluminum composite plate, a steel / aluminum composite plate, a magnesium / aluminum composite plate, a titanium / steel composite plate or a stainless steel / carbon steel composite plate; the rolling mill group (3) is any one of a two-roll rolling mill, a four-roll rolling mill or a six-roll rolling mill; the rolling mode of the rolling mill group (3) is any one of the same diameter and same speed, different diameters and same speed, and same diameter and different speed.

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