Double-roller type axial variable tension roller device and method for regulating and controlling complex plate shape of precise strip

Abstract

The invention discloses a double-roller type axial variable tension roller device and method for regulating and controlling the complex plate shape of a precise strip, and relates to the technical field of precise plate strip rolling, the double-roller type axial variable tension roller device comprises an axial variable tension roller rack and two axial variable tension rollers, the two axial variable tension rollers are arranged up and down, a strip is arranged between the two axial variable tension rollers, and the two axial variable tension rollers are arranged up and down. The two axial variable tension rollers are adjustable and controllable in a segmented mode and are connected with the axial variable tension roller rack through the bearing seats, the axial variable tension roller rack is connected with the dip angle adjusting hydraulic cylinder, and the other end of the dip angle adjusting hydraulic cylinder is connected with the production line base. Compared with a single-roller axial variable tension roller, the double-roller axial variable tension roller device and method for regulating and controlling the complex plate shape of the precise strip can form supporting force and pressure stress on the surface of the strip at the same time, transverse variable tension stress with the severe stress gradient can be constructed, and the precision of the strip is improved. And the requirements of complex plate deformation tensile stress regulation and control are met.

Description

Technical Field

[0001] The present invention relates to the technical field of precision strip rolling, in particular to a double-roll type axial variable-tension roll device and method for regulating complex strip shapes of precision strips. Background Art

[0002] Precision strips belong to high-end products of strip materials and are widely used in many fields such as aerospace, medical 3C electronics, military nuclear power, and precision manufacturing. Rolling is the most important and efficient precision strip production process. With the development of strips towards ultra-thin, ultra-wide, and ultra-hard directions, the strip shape problem has increasingly become a key core problem restricting precision strip rolling. Tensile stress can effectively regulate the rolling pressure distribution and has great potential in solving the flatness problem commonly existing in the process of precision foil strip rolling.

[0003] The online control technology of axial variable tensile stress is a new idea for strip shape control proposed in recent years. The construction of variable tensile stress is the premise for exerting the strip shape regulation ability of axial variable tensile stress. The invention patent CN202210668771.2 proposes a rolling method capable of realizing axial variable tension, and proposes to construct axial variable tensile stress along the width direction of the strip by using a tension roll supported by segmented capsules. The invention patent CN202210671148.2 proposes a tension roll system capable of realizing axial variable tension rolling, and specifically applies a tension roll structure with segmented variable tension by covering an integrally expandable capsule outside the tension roll mandrel. CN202211029055.6 further proposes a connection structure and method for connecting the expandable capsule and the tension roll mandrel by using a quick-change joint. The invention patent CN202410359948.X proposes an axial variable-tension roll device for hot rolling, solves the problem of sudden change in tension between segmented capsules of axial variable tensile stress, and extends the axial variable tensile stress technology to the hot rolling field. The above methods all adopt a segmented capsule one-way support structure, which can only apply a support force and cannot apply a tensile force on the strip surface. For simple flatness problems of middle waves and edge waves, due to the small difference in tension compensation between adjacent regions, there is no large sudden change in support force between adjacent capsules, and thus a good regulation ability can be shown.

[0004] Complex waves and high-order waves are the difficulties in flatness control. Generally, it is necessary to construct an axially edge tensile stress with an obvious gradient. How to construct a complex axially variable tensile stress has become the key to the development of variable tensile stress technology. The axially variable tension roll supported by a single roll is difficult to meet the large-difference axially variable tensile stress required for complex flatness. In the case of a traditional single axially variable tension roll with a large radial pressure difference, the coupling phenomenon of adjacent segmented support force control is obvious. For the segmented bladder type or hard support with a large support pressure of the tension roll, discontinuous contact and gaps will be formed between the strip and the surface of the tension roll, and only a gradient support force can be formed, which is not enough to construct a complex radial support force and tensile force, and cannot meet the need for local small tensile stress, resulting in uncontrollable complex axially variable tensile stress and obvious insufficient flatness regulation ability. Therefore, it is necessary to design a tension roll that can simultaneously form compressive stress and support force locally on the surface of the strip to meet the construction requirements of complex axially variable tensile stress.

[0005] In addition, the tension compensation limit and support force characteristics provided by the contact wrap angle between different strips and tension rolls are different. Providing different contact wrap angles can improve the adaptability of the axially variable tensile stress technology under different working conditions. However, the structure of the axially variable tension roll proposed in the above patent is fixedly installed and does not have an independent wrap angle adjustment system. Changing the contact wrap angle between the strip and the axially variable tension roll can only be achieved by adjusting the relative positions of other roll systems, which is cumbersome, costly, and has a low degree of intelligence. Therefore, there is an urgent need for an axially variable tension roll with the ability to construct high-difference axially variable tensile stress and the ability to adjust the contact wrap angle. Summary of the Invention

[0006] The purpose of the present invention is to provide a double-roll axially variable tension roll device and method for precisely controlling the complex flatness of strip materials, effectively solving the coupling phenomenon of adjacent segmented support force control, and avoiding the problems of discontinuous contact and gaps between adjacent bladders caused by different support forces of adjacent bladders and the difficulty in adjusting the tension compensation limit and support force characteristics of the axially variable tension roll.

[0007] To achieve the above purpose, the present invention provides a double-roll axially variable tension roll device for precisely controlling the complex flatness of strip materials, including an axially variable tension roll frame and axially variable tension rolls. There are two axially variable tension rolls, which are arranged vertically. A strip is arranged between the two axially variable tension rolls. The two axially variable tension rolls are segmentally adjustable to control the segmented support force of the strip.

[0008] Both of the two axially variable tension rolls are connected to the axially variable tension roll frame through bearing seats. The axially variable tension roll frame is connected to an inclination adjustment hydraulic cylinder, and the other end of the inclination adjustment hydraulic cylinder is connected to the production line base.

[0009] Preferably, a window is provided on the axial variable-tension roll frame, a copper sliding plate is arranged in the window, the copper sliding plate is in relative contact with the bearing seat, and a distance detection module is installed on the bearing seat.

[0010] Preferably, the upper axial variable-tension roll is connected to the tension roll balancing device. Connecting plates are arranged at the ends of the tension roll balancing device. The connecting plates are arranged in an L-shaped structure. The bottom of the connecting plate is connected to the bearing seat by bolts. The tension roll balancing device is arranged in the middle of the cross beam of the axial variable-tension roll frame.

[0011] Preferably, an upper fixing seat and a lower fixing seat are provided on the window. Both the lower fixing seat and the upper fixing seat are connected to the axial variable-tension roll frame by bolts. Both the upper fixing seat and the lower fixing seat are connected to the pre-tightening and position adjusting hydraulic cylinder.

[0012] Preferably, the hydraulic cylinders of the pre-tightening and position adjusting hydraulic cylinder are connected to both the upper fixing seat and the lower fixing seat. A pressure detection module is connected between the upper fixing seat, the lower fixing seat and the hydraulic cylinder barrel. The hydraulic cylinder rods of the pre-tightening and position adjusting hydraulic cylinder are in contact with the bearing seat.

[0013] Preferably, both the upper fixing seat and the lower fixing seat are arranged above the connecting plate, and the hydraulic cylinder barrel is arranged between the connecting plates.

[0014] Preferably, a contact wrap angle adjusting shaft hole is provided on the lower side of the axial variable-tension roll frame. The contact wrap angle adjusting shaft hole is connected to the rolling mill frame through a hinge shaft.

[0015] Preferably, two inclination adjusting hydraulic cylinders are provided. One ends of the two inclination adjusting hydraulic cylinders are hingedly connected to the axial variable-tension roll frame through shafts, and the other ends are hingedly connected to the production line base through shafts. The production line base is arranged inside the rolling mill frame.

[0016] Preferably, a strip is arranged between the two axial variable-tension rolls. The two axial variable-tension rolls are segmentally adjustable to control the strip support force in segments.

[0017] Preferably, the contact area between the axial variable-tension roll and the strip is arranged at a position 200 - 500 mm away from the rolling mill deformation zone.

[0018] A method for using the double-roll type axial variable-tension roll device for precise strip complex shape control includes the following steps:

[0019] Step 1: Thread the strip before rolling. The tension roll balancing device cooperates with the position adjustment hydraulic cylinder to lift the upper roll of the axial variable tension roll, forming a roll gap of 10 mm between the upper and lower rolls. Thread the strip through the middle of the roll gap of the double-axis variable tension roll, and then through the roll gap of the rolling mill and wind it around the coiler. Subsequently, the rolling mill presses down the strip to prepare for rolling;

[0020] Step 2: Adjust the inclination angle of the axial variable tension roll. Determine the inclination angle according to the requirements of the tension stress rolling process, and lock the inclination angle adjustment hydraulic cylinder to ensure the inclination angle state of the axial variable tension roll;

[0021] Step 3: Adjust the position of the axial variable tension roll in the frame window. Use the pre-tightening and position adjustment hydraulic cylinder to adjust the lower roll of the axial variable tension roll in the double-roll axial variable tension roll frame. The lower roll of the tension roll supports the lower surface of the strip to reach the set value of the average tension stress of the strip and tighten the strip; use the pre-tightening and position adjustment hydraulic cylinder to adjust the upper roll of the double-roll axial variable tension roll and press it on the upper surface of the strip to form a uniform pre-pressure of 0.01 MPa;

[0022] Step 4: During the rolling process, adjust the support force of each segment of the double-roll axial variable tension roll in real time. Apply a uniform tension stress on the strip surface through the double-roll axial variable tension roll in the first 50 m stage before rolling. During the subsequent rolling process, adjust the upper and lower roll segment support forces of the double-roll axial variable tension roll according to the measured strip shape distribution law of the rolled strip. The upper roll of the double-roll axial variable tension roll forms a local compressive stress on the strip surface, and the lower roll of the double-roll axial variable tension roll forms a local support stress on the strip surface. According to the actual needs of the strip shape, control the magnitudes of the local compressive stress and local support stress along the axial direction of the tension roll in segments, and actively regulate the transverse distribution of the tension stress in the rolling direction to achieve closed-loop control of the strip shape.

[0023] Therefore, the double-roll axial variable tension roll device and method for precisely controlling the complex strip shape of the present invention have the following beneficial effects:

[0024] (1) Compared with the single-roll axial variable tension roll, the double-roll axial variable tension roll of the present invention can simultaneously form a support force and a compressive stress on the strip surface, and can construct a transverse variable tension stress with a steep stress gradient to meet the requirements of complex strip shape variable tension stress control.

[0025] (2) The double-roll axial variable tension roll device of the present invention can dynamically adjust the wrap angle of the strip wrapped around the surface of the tension roll, improve the influence of the transverse variable tension stress structure of the tension roll, and improve the flexibility of the tension roll control.

[0026] (3) The double-roll axial variable tension roll of the present invention is close to the deformation zone of the frame, which can more effectively ensure the action effect of the transverse variable tension stress on the rolling deformation zone.

[0027] The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. Description of the Drawings

[0028] Figure 1 This is a schematic structural diagram of an embodiment of a double-roll type axially variable tension roll device for controlling the complex strip shape of precision strip materials according to the present invention;

[0029] Figure 2 This is an axonometric view of a double-roll type axially variable tension roll device for controlling the complex strip shape of precision strip materials according to the present invention;

[0030] Figure 3 This is a side view of an embodiment of a double-roll type axially variable tension roll device for controlling the complex strip shape of precision strip materials according to the present invention;

[0031] Figure 4 This is a schematic structural diagram of an axially variable tension roll frame of a double-roll type axially variable tension roll device for controlling the complex strip shape of precision strip materials according to the present invention;

[0032] Figure 5 is Figure 1 an enlarged view of the structure at position A in

[0033] Reference Signs

[0034] 1. Axially variable tension roll frame; 101. Copper slide plate; 102. Contact wrap angle adjustment shaft hole; 103. Upper fixed seat; 104. Lower fixed seat; 105. Bolt; 2. Axially variable tension roll; 201. Bearing seat; 3. Tension roll balancing device; 301. Connecting plate; 4. Pre-tightening and position adjustment hydraulic cylinder; 401. Upper pre-tightening and position adjustment hydraulic cylinder; 402. Lower pre-tightening and position adjustment hydraulic cylinder; 5. Inclination adjustment hydraulic cylinder; 501. Shaft; 502. Production line base; 6. Pressure detection module; 7. Distance detection module; 8. Rolling mill frame. Detailed Embodiments

[0035] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0037] Embodiment

[0038] Please refer to Figures 1-5 , the present invention provides a double-roll type axial variable-tension roll device for regulating the complex strip shape of precision strip materials, including an axial variable-tension roll frame 1 and axial variable-tension rolls 2. There are two axial variable-tension rolls 2, which are arranged vertically. The two rolls respectively form compressive stress and supporting force to realize a local large-gradient variable tensile stress structure. During operation, the strip passes through the middle of the upper and lower axial variable-tension rolls 2 and contacts the surfaces of the axial variable-tension rolls 2 respectively. Both axial variable-tension rolls 2 are connected to the axial variable-tension roll frame 1 through bearing seats 201. The axial variable-tension roll frame 1 is connected to an inclination adjustment hydraulic cylinder 5, and the other end of the inclination adjustment hydraulic cylinder 5 is connected to a production line base 502.

[0039] A window is provided on the axial variable-tension roll frame 1, and a copper slide plate 101 is arranged in the window. The copper slide plate 101 is in relative contact with the bearing seat 201. A distance detection module 7 is installed on the bearing seat 201. The distance detection module 7 is used for the position detection of the axial variable-tension roll 2, and cooperates with the inclination adjustment hydraulic cylinder 5 to realize the position control of the tension roll, and finally realizes the adjustment and control of the wrap angle of the strip on the surface of the tension roll. A contact wrap angle adjustment shaft hole 102 is provided on the lower side of the axial variable-tension roll frame 1. The contact wrap angle adjustment shaft hole 102 is connected to a rolling mill frame 8 through a hinge shaft, so that the axial variable-tension roll frame is arranged close to the outlet and inlet of the rolling mill.

[0040] The upper axial variable-tension roll 2 is connected to a tension roll balancing device 3. The tension roll balancing device 3 is used to balance its own weight and is also convenient for threading and installation. Connecting plates 301 are provided at both ends of the tension roll balancing device 3. The connecting plates 301 are arranged in an L-shaped structure. The bottom of the connecting plates 301 is connected to the bearing seat 201 through bolts 105. The tension roll balancing device 3 is arranged in the middle of the cross beam of the axial variable-tension roll frame 1.

[0041] An upper fixing seat 103 and a lower fixing seat 104 are provided on the window. Both the lower fixing seat 104 and the upper fixing seat 103 are connected to the axial variable-tension roll frame 1 through bolts 105. Both the upper fixing seat 103 and the lower fixing seat 104 are connected to a pre-tightening and position adjustment hydraulic cylinder 4.

[0042] The preloading and position - adjusting hydraulic cylinder 4 is used to adjust the position of the axially variable - tension roll 2 and the pre - pressing force acting on the strip. The force measurement is realized through the pressure - detection module 6. The hydraulic cylinder barrel of the preloading and position - adjusting hydraulic cylinder 4 includes an upper preloading and position - adjusting hydraulic cylinder 401 and a lower preloading and position - adjusting hydraulic cylinder 402. The upper preloading and position - adjusting hydraulic cylinder 401 is connected to the upper fixed seat 103, and the lower preloading and position - adjusting hydraulic cylinder 402 is connected to the lower fixed seat 104, and both are connected to the pressure - detection module 6. The hydraulic cylinder rods of the upper preloading and position - adjusting hydraulic cylinder 401 and the lower preloading and position - adjusting hydraulic cylinder 402 are in contact connection with the bearing seat 201, and the hydraulic cylinder rods push out the bearing seat.

[0043] Both the upper fixed seat 103 and the lower fixed seat 104 are arranged on the upper part of the connecting plate 301. The hydraulic cylinder barrel is arranged between the connecting plates 301, and there is no mutual influence between the connecting plate 301 and the hydraulic cylinder barrel.

[0044] There are two inclination - adjusting hydraulic cylinders 5. By setting the inclination - adjusting hydraulic cylinders, the contact surface and angle between the axially variable - tension roll 2 and the sheet are adjusted. One end of each of the two inclination - adjusting hydraulic cylinders 5 is hingedly connected to the axially variable - tension roll frame 1 through a shaft 501, and the other end is hingedly connected to the production - line base 502 through a shaft 501. The production - line base 502 is arranged inside the rolling - mill frame 8.

[0045] The axially variable - tension roll 2 is a roll body with a segmented adjustable structure arranged axially. The regulation of each segment of the axially variable - tension roll is realized through a fluid medium or an electric cylinder arranged radially, so as to realize the segmented control of the supporting force of the coated strip, and then adjust the distribution of the tensile stress along the width direction of the strip, realize the control of the axially variable tensile stress of the strip. The contact area between the double - roll axially variable - tension roll and the strip is arranged at a position 200 - 500 mm away from the rolling - mill deformation zone to ensure the effect of the axially variable tensile stress.

[0046] The specific working process includes the following steps:

[0047] The first step: threading the strip before rolling. The tension - roll balancing device 3 eliminates the gap between the bearing seats 201 of the double axially variable - tension rolls, the preloading and position - adjusting hydraulic cylinder barrel, and the pressure - detection module 6, preventing impact after being stressed. At the same time, it cooperates with the position - adjusting hydraulic cylinder to lift the upper roll of the double axially variable - tension roll 2 to form a roll gap of 10 mm between the upper and lower rolls. The strip is passed through the roll gap of the double axially variable - tension roll 2 and then through the roll gap of the rolling mill and wound around the coiler. Subsequently, the rolling mill presses down the strip to make preparations for rolling.

[0048] The second step: adjusting the inclination of the double - roll axially variable - tension roll 2. Use the inclination - adjusting hydraulic cylinder 5 to adjust the inclination of the tension roll, determine the inclination angle according to the requirements of the tensile - stress rolling process, and lock the inclination - adjusting hydraulic cylinder 5 to ensure the inclination state of the axially variable - tension roll 2.

[0049] Step 3: Adjust the position of the double-roll axial variable-tension roll 2 in the frame window to pre-tighten the strip. Use the pre-tightening and position-adjusting hydraulic cylinder 4 to adjust the lower roll of the axial variable-tension roll 2 in the double-roll axial variable-tension roll frame 1, with the lower roll of the tension roll supporting the lower surface of the strip, to reach the set value of the average tensile stress of the strip and achieve strip tensioning; use the pre-tightening and position-adjusting hydraulic cylinder 4 to adjust the upper roll of the double-roll axial variable-tension roll 2, pressing on the upper surface of the strip to form a uniform pre-pressure of 0.01 MPa.

[0050] Step 4: During the rolling process, adjust the support force of each section of the double-roll axial variable-tension roll 2 in real time. Apply a uniform tensile stress on the strip surface through the double-roll axial variable-tension roll 2 in the first 50 m stage before rolling. During the subsequent rolling process, according to the measured shape distribution law of the rolled strip, adjust the support forces of the upper and lower rolls of the double-roll axial variable-tension roll 2. Use the upper roll of the double-roll axial variable-tension roll 2 to form local compressive stress on the strip surface, and use the lower roll of the double-roll axial variable-tension roll 2 to form local support stress on the strip surface. According to the actual shape requirements, control the magnitudes of the local compressive stress and local support stress section by section along the axial direction of the tension roll, as an on-line real-time shape control means, actively regulate the transverse distribution of the tensile stress in the rolling direction, and then affect the rolling deformation zone to achieve closed-loop control of the strip shape.

[0051] Therefore, the present invention adopts the above double-roll axial variable-tension roll device and method for precisely controlling the complex shape of strip materials. Compared with the single-roll axial variable-tension roll, the double-roll axial variable-tension roll of the present invention can simultaneously form support force and compressive stress on the strip surface, and can construct a transverse variable tensile stress with a sharp stress gradient to meet the requirements of regulating the variable tensile stress of complex strip shapes. The double-roll axial variable-tension roll device of the present invention can dynamically adjust the wrap angle of the strip around the surface of the tension roll, improve the influence of the structure of the transverse variable tensile stress of the tension roll, and enhance the flexibility of the tension roll regulation. The double-roll axial variable-tension roll of the present invention is close to the deformation zone of the frame, which can more effectively ensure the effect of the transverse variable tensile stress on the rolling deformation zone.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements do not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. Double-roller axial variable-tension roll device for regulating complex strip shape of precision strip, characterized in that: It includes an axially variable-tension roll frame and axially variable-tension rolls. There are two axially variable-tension rolls, which are arranged vertically. A strip is arranged between the two axially variable-tension rolls. The two axially variable-tension rolls are segmentally adjustable to control the strip support force in segments. Both of the two axially variable-tension rolls are connected to the axially variable-tension roll frame through bearing seats. The axially variable-tension roll frame is connected to an inclination adjustment hydraulic cylinder, and the other end of the inclination adjustment hydraulic cylinder is connected to the production line base.

2. The double-roll type axial variable-tension roll device for precisely controlling the complex strip shape according to claim 1, wherein: A window is provided on the axially variable-tension roll frame. A copper slide plate is arranged in the window. The copper slide plate is in relative contact with the bearing seat, and a distance detection module is installed on the bearing seat.

3. The double-roll type axial variable-tension roll device for precision strip complex shape control according to claim 2, characterized in that: The upper axially variable-tension roll is connected to a tension roll balancing device. Connection plates are arranged at the ends of the tension roll balancing device. The connection plates are arranged in an L-shaped structure, and the bottom of the connection plate is connected to the bearing seat through bolts.

4. The double-roll type axial variable-tension roll device for precisely controlling the complex strip shape according to claim 3, wherein: An upper fixing seat and a lower fixing seat are provided on the window. Both the lower fixing seat and the upper fixing seat are connected to the axially variable-tension roll frame. Both the upper fixing seat and the lower fixing seat are connected to a pre-tightening and position adjustment hydraulic cylinder.

5. The double-roll type axial variable-tension roll device for precision strip complex shape control according to claim 4, characterized in that: The hydraulic cylinders of the pre-tightening and position adjustment hydraulic cylinders are both connected to the upper fixing seat and the lower fixing seat. A pressure detection module is connected between the upper fixing seat, the lower fixing seat and the hydraulic cylinder barrel. The hydraulic cylinder rods of the pre-tightening and position adjustment hydraulic cylinders are all in contact with the bearing seat.

6. The double-roll type axial variable-tension roll device for precisely regulating the complex strip shape according to claim 5, wherein: Both the upper fixing seat and the lower fixing seat are arranged above the connection plate, and the hydraulic cylinder barrel is arranged between the connection plates.

7. The double-roll type axial variable-tension roll device for precisely controlling the complex strip shape according to claim 6, characterized in that: A contact wrap angle adjustment shaft hole is provided on the lower side of the axially variable-tension roll frame. The contact wrap angle adjustment shaft hole is connected to the rolling mill frame through a hinge shaft.

8. The double-roll type axial variable-tension roll device for precisely controlling the complex strip shape according to claim 7, characterized in that: There are two inclination adjustment hydraulic cylinders. One end of each of the two inclination adjustment hydraulic cylinders is hingedly connected to the axially variable-tension roll frame through a shaft, and the other end of each is hingedly connected to the production line base through a shaft. The production line base is arranged inside the rolling mill frame.

9. The double-roll type axial variable-tension roll device for precision strip complex shape control according to claim 8, characterized in that: The contact area between the axially variable-tension roll and the strip is arranged at a position 200 - 500 mm away from the rolling mill deformation zone.

10. A method of using the double-roll type axial variable-tension roll device for precise strip complex shape control according to any one of claims 1-9 above, characterized in that, It includes the following steps: Step 1: Thread the strip before rolling. The tension roll balancing device cooperates with the position adjustment hydraulic cylinder to lift the upper roll of the axially variable-tension roll, form a roll gap of 10 mm between the upper and lower rolls, pass the strip through the middle of the roll gap of the double-axially variable-tension roll, and pass through the roll gap of the rolling mill and wind it on the coiler. Subsequently, the rolling mill presses down the strip to make preparations for rolling. Step 2: Adjust the inclination angle of the axially variable-tension roll. Determine the inclination angle according to the requirements of the tensile stress rolling process, and lock the inclination adjustment hydraulic cylinder to ensure the inclination state of the axially variable-tension roll. Step 3: Adjust the position of the axially variable-tension roll in the frame window. Use the pre-tightening and position adjustment hydraulic cylinder to adjust the lower roll of the axially variable-tension roll in the double-roll type axially variable-tension roll frame. The lower roll of the tension roll supports the lower surface of the strip to reach the set value of the average tensile stress of the strip and tension the strip. Use the pre-tightening and position adjustment hydraulic cylinder to adjust the upper roll of the double-roll type axially variable-tension roll and press it on the upper surface of the strip to form a uniform pre-pressure of 0.01 MPa. Step 4. During the rolling process, the segmental supporting forces of the double-roll type axially variable tension rolls are adjusted in real time. In the first 50 m stage before rolling, a uniform tensile stress is applied to the strip surface by the double-roll type axially variable tension rolls. During the subsequent rolling process, according to the measured shape distribution law of the rolled strip, the upper and lower roll segmental supporting forces of the double-roll type axially variable tension rolls are adjusted. The upper roll of the double-roll type axially variable tension rolls forms a local compressive stress on the strip surface, and the lower roll of the double-roll type axially variable tension rolls forms a local supporting stress on the strip surface. According to the actual shape requirements, the magnitudes of the local compressive stress and the local supporting stress are controlled in segments along the axial direction of the tension rolls, and the transverse distribution of the tensile stress in the rolling direction is actively regulated to achieve closed-loop control of the strip shape.

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