A reversible precision copper foil rolling production line, production process and tension control method

Abstract

A reversible precision copper foil rolling production line, production process and tension control method. The reversible precision copper foil rolling production line includes a 20-high reversible rolling mill and an oil mist cooling device, an X-ray thickness gauge, a laser speedometer, a shape roll, and a coiler that are symmetrically arranged on both sides of the reversible rolling mill in sequence. A magnetorheological fluid clutch is provided in the driving transmission chain of the coiler, and the rolling tension output by the reel is controlled by controlling the working torque of the magnetorheological fluid clutch. The signals collected by the shape roll are fed back to the reversible rolling mill for shape control, and at the same time, the signals collected by it are also fed back to the coiler to accurately control the working torque of the magnetorheological fluid clutch in the driving transmission chain of the coiler, so as to achieve accurate control of the rolling tension. The reversible precision copper foil rolling production line adopts a production process with a small negative roll gap rolling force and high-speed rolling. By accurately controlling the inlet tension, outlet tension and rolling speed of the rolling mill, the dimensional accuracy and residual stress of the rolled foil are fully guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of the production of non-ferrous metal precision strip and foil materials, and particularly to a reversible precision copper foil rolling production line, a production process and a tension control method. Background Art

[0002] Copper strip and foil are the main product types in the processing and application of copper and its alloys, accounting for more than 20% of the output of deformed copper. They are widely used in fields such as aerospace, national defense, military equipment, modern communication, electronic information, and lithium batteries. With the continuous development of technology, the quality requirements for copper foil in fields such as aerospace, national defense, military equipment, modern communication, and electronic information are getting higher and higher, including stricter requirements for the dimensional accuracy, residual stress, surface finish, anisotropy, elongation, strength, dielectric constant, corrosion resistance, high temperature resistance, and creep resistance of copper strip and foil. Such high-grade copper strip and foil materials are also known as "precision strip and foil materials" in the domestic and international industries.

[0003] The quality assurance of "precision strip and foil materials" is determined by the entire process of copper billet hot rolling, copper strip rough rolling, intermediate rolling, copper foil finish rolling, surface treatment, and heat treatment in the production of "precision strip and foil materials". However, the final rolling production equipment and production process of "precision strip and foil materials" play a decisive role in the final quality of "precision strip and foil materials". In particular, double-zero copper foil materials in "precision strip and foil materials", as high-end products in "precision strip and foil materials", have higher requirements for the control accuracy of parameters in the final rolling production equipment and production process.

[0004] Existing double-zero rolled copper foil materials mostly use six-high mills to roll C1700 series pure copper. Since the working roll diameter of six-high mills is relatively large, the effect is not ideal when rolling double-zero foils of copper alloys with high deformation resistance during the rolling process. In addition, due to the high degree of monopoly of foreign manufacturers on six-high mills, the purchase cost is also relatively high. Therefore, it is theoretically a better choice to use a twenty-high mill with a higher maturity and a relatively lower purchase cost (whose working roll diameter is also smaller than that of six-high mills) to replace six-high mills for double-zero foil rolling of copper alloys.

[0005] Previously, copper foil manufacturers have tried to use a twenty-high rolling mill to roll double-zero copper alloy foil. However, the control effects of the dimensional accuracy and residual stress of the copper alloy foil after rolling are not ideal. The reasons are as follows: The foil rolling process of double-zero copper foil uses negative roll gap rolling, and there are two control methods for its rolling process parameters: 1. Using a large negative roll gap rolling force and slow rolling speed to ensure the dimensional accuracy and residual stress of the foil after rolling through the negative roll gap rolling force. This process parameter control is relatively simple and is used more frequently. However, this process also has problems such as low production efficiency, large bearing pressure on the rolling mill bearings, and unstable dimensional accuracy and residual stress of the produced copper foil; 2. Using a smaller negative roll gap rolling force and high rolling speed to ensure the dimensional accuracy and residual stress of the foil after rolling by controlling the inlet tension, outlet tension, and rolling speed of the rolling mill. This process has high production efficiency and small bearing pressure on the rolling mill bearings, but has extremely high requirements for the control accuracy of process parameters, especially for the control accuracy of the inlet tension, outlet tension, and rolling speed of the rolling mill. Once the tension control is poor during the production process, it is easy to cause unstable problems with the dimensional accuracy and residual stress of the produced copper foil. In severe cases, it will also cause a break in the strip, resulting in the forced interruption of production and seriously affecting the normal production of the enterprise. Summary of the Invention

[0006] In order to overcome the deficiencies in the background technology, the present invention discloses a reversible precision copper foil rolling production line, production process, and tension control method; the reversible precision copper foil rolling production line includes a 20-high reversible rolling mill and an oil mist cooling device, an X-ray thickness gauge, a laser speedometer, a shape roller, and a coiler that are symmetrically arranged on both sides of the reversible rolling mill in sequence. A magnetorheological fluid clutch is provided in the drive transmission chain of the coiler, and the rolling tension output by the reel is controlled by controlling the working torque of the magnetorheological fluid clutch; the signal collected by the shape roller is fed back to the reversible rolling mill for shape control, and at the same time, its collected signal is also fed back to the coiler to accurately control the working torque of the magnetorheological fluid clutch in the drive transmission chain of the coiler, realizing the accurate control of the rolling tension.

[0007] In order to achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions: A reversible precision copper foil rolling production line includes a reversible rolling mill, a coiler, a shape roller, a laser speedometer, an X-ray thickness gauge, and an oil mist cooling device; the rolling mill is a 20-high reversible rolling mill; the oil mist cooling device, the X-ray thickness gauge, the laser speedometer, and the shape roller are symmetrically arranged on both sides of the reversible rolling mill in sequence; the signal collected by the shape roller is fed back to the reversible rolling mill for shape control, and at the same time, its collected signal is also fed back to the coiler for rolling tension control during the rolling process.

[0008] Furthermore, the coiler includes a frame, a reel, a torque synthesis speed reducer, a magnetorheological fluid clutch, a gearbox, and a motor; the reel is rotatably arranged on the frame, and the reel is sequentially connected to the motor through the torque synthesis speed reducer, the magnetorheological fluid clutch, and the gearbox; in the technical solution of the reverse precision copper foil rolling production line of the present invention, the traditional control structure for controlling the rolling tension by controlling the rotational speed difference between the reel and the work roll or the driving torque of the reel driving motor is changed, but the working torque of the magnetorheological fluid clutch is directly used to control the torque of the reel, and finally the control of the rolling tension is realized. Therefore, the problems of long transmission chain length, large moment of inertia, slow response speed, and low precision of the driving system of the traditional tension control structure are overcome.

[0009] Furthermore, the torque synthesis speed reducer includes a torque output shaft and several torque input shafts. The torque output shaft is connected to the several torque input shafts through gear meshing, and a fixed reduction ratio is provided between the torque output shaft and the torque input shafts; the gearbox is provided with output shafts having the same number as the torque input shafts of the torque synthesis speed reducer; one end of the reel is fixedly connected to the torque output shaft of the torque synthesis speed reducer through a coupling; between the several torque input shafts of the torque synthesis speed reducer and the several output shafts of the gearbox, they are respectively connected through several magnetorheological fluid clutches, and the input shaft of the gearbox is connected to the output shaft of the motor; the working torques of the several magnetorheological fluid clutches are synthesized by the torque synthesis speed reducer into a larger driving torque to drive the reel to rotate, and the rolling tension output by the reel is finally controlled by controlling the synthesized driving torque; the reason for setting multiple magnetorheological fluid clutches in the driving system transmission chain of the coiler is that the maximum torque that the existing magnetorheological fluid clutch can provide is small, while the rolling tension required for copper alloy foil rolling is large, and currently it is not possible to provide sufficient working torque for the reel with one magnetorheological fluid clutch.

[0010] A precision copper foil rolling production process for a reversible precision copper foil rolling production line, with an initial rolling thickness of 0.05 mm and a final rolling thickness of 0.006 mm, divided into 3 rolling passes, and the processing rate of each rolling pass does not exceed 50%; among them, the first rolling pass rolls to 0.025 mm with two rolling passes; the second rolling pass rolls to 0.09 mm with three rolling passes; the third rolling pass rolls to 0.006 mm with three rolling passes; low-temperature annealing treatment is required between each rolling pass; reverse rolling is carried out with negative roll gap, constant tension, and constant rolling speed; among them, the control precision of the inlet tension and outlet tension of the reversible rolling mill is ≤±0.1%T (T is the tension value).

[0011] A rolling tension control method for a reversible precision copper foil rolling production line, which feedback-controls the working torque of a single one of several magnetorheological fluid clutches through the tension signal collected by a shape roller to achieve precise control of the combined torque; through precise control of the combined torque, precise control of the rolling tension provided by the reel is achieved; in the present invention, several magnetorheological fluid clutches finally synthesize the torque required for the reel to work through a torque synthesis reduction gearbox, and the reduction ratio between the torque input shaft and the torque output shaft (reel) of the torque synthesis reduction gearbox is 1:1; when controlling the output torque of the torque synthesis reduction gearbox, if multiple magnetorheological fluid clutches are adjusted and controlled simultaneously, although its adjustment and control method is relatively simple, it will lead to a reduction in control accuracy; by adjusting and controlling the working torque of a single one of multiple magnetorheological fluid clutches, although its adjustment and control method is relatively complex, it can significantly improve the control accuracy of the rolling tension finally output by the reel.

[0012] Furthermore, by controlling the working torque actually provided by several magnetorheological fluid clutches, the combined driving torque is controlled; the rolling tension output by the reel is controlled by the combined driving torque; its control process includes the following steps:

[0013] S1. Setting the working speed of the magnetorheological fluid clutch: The working speed of the magnetorheological fluid clutch is the rotational speed difference between its torque input shaft and torque output shaft; for the coiler at the outlet end of the reversible rolling mill, the rotational speed difference between the torque input shaft and torque output shaft is set to be maintained between +20 - 80 rpm, that is, the rotational speed of the torque input shaft is higher than that of the torque output shaft; for the coiler at the inlet end of the reversible rolling mill, the rotational speed difference between the torque input shaft and torque output shaft is set to be maintained between -20 - 80 rpm, that is, the rotational speed of the torque input shaft is lower than that of the torque output shaft;

[0014] S2. Allocating the working torque of the magnetorheological fluid clutch: Its initial working torque is evenly allocated to several magnetorheological fluid clutches according to the torque actually required for the reel to work, and the calculation formula is:

[0015] Mci = Mj / I * n......(1)

[0016] Mj = T * Rj......(2)

[0017] Where: Mci is the torque allocated to a single magnetorheological fluid clutch; Mj is the torque actually required for the reel to work; I is the transmission ratio between the torque output shaft of the magnetorheological fluid clutch and the reel; n is the number of magnetorheological fluid clutches; T is the rolling tension; Rj is the outer diameter of the copper strip coil on the reel;

[0018] S3. Working torque control of magnetorheological fluid clutch: The working torques of several magnetorheological fluid clutches are formed by the tension signals collected by the plate-shaped roller for PID control; during the feedback control process, only one of several magnetorheological fluid clutches is controlled for working torque adjustment; a threshold value is set for the torque cumulative adjustment value of one magnetorheological fluid clutch; when the torque cumulative adjustment value of the magnetorheological fluid clutch under feedback control reaches or exceeds the set threshold value, the feedback control process starts to perform feedback control on another magnetorheological fluid clutch according to the set order; and so on. During the entire feedback control process, the feedback control of each magnetorheological fluid clutch is realized.

[0019] Preferably, for the initial working torque distribution of the magnetorheological fluid clutch, the torque value evenly distributed to several magnetorheological fluid clutches according to the actual working torque required by the reel is taken as the intermediate value, and the torque values are randomly distributed to several magnetorheological fluid clutches in the form of an arithmetic progression; the difference of the arithmetic progression is the torque cumulative value allowed for adjustment of one magnetorheological fluid clutch.

[0020] Due to the above-mentioned technical solution, the present invention has the following beneficial effects: A reversible precision copper foil rolling production line, production process and tension control method disclosed by the present invention. The reversible precision copper foil rolling production line includes a 20-high reversible rolling mill and an oil mist cooling device, an X-ray thickness gauge, a laser speedometer, a plate-shaped roller, and a coiler symmetrically arranged on both sides of the reversible rolling mill in sequence. A magnetorheological fluid clutch is arranged in the driving transmission chain of the coiler, and the rolling tension output by the reel is controlled by controlling the working torque of the magnetorheological fluid clutch; the signals collected by the plate-shaped roller are fed back to the reversible rolling mill for plate shape control, and at the same time, the collected signals are also fed back to the coiler to accurately control the working torque of the magnetorheological fluid clutch in the driving transmission chain of the coiler, so as to realize the accurate control of the rolling tension; the reversible precision copper foil rolling production line adopts a smaller negative roll gap rolling force and a high-speed rolling production process. By accurately controlling the inlet tension, outlet tension and rolling speed of the rolling mill, the dimensional accuracy and residual stress of the copper alloy double-zero foil are fully guaranteed, thereby realizing the substitution of foreign copper alloy double-zero foils and solving the bottleneck problem in the production of domestic high-end copper foils. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a reversible precision copper foil rolling production line;

[0022] Figure 2 It is a schematic transmission structure diagram of the coiler;

[0023] Figure 3 It is a schematic structural diagram of a torque synthesis reduction gear;

[0024] Figure 4 It is a schematic flow diagram of the reel tension control.

[0025] In the figure: 1. Reversing mill; 2. Coiler; 2.1. Frame; 2.2. Intermediate product coiler reel; 2.3. Torque synthesis speed reducer; 2.3.1. Torque output shaft; 2.3.1.1. Output shaft gear; 2.3.1.2. Output shaft coupling; 2.3.2. Torque input shaft; 2.3.2.1. Input shaft gear; 2.3.2.2. Input shaft coupling; 2.4. Magnetorheological fluid clutch; 2.5. Gearbox; 2.6. Motor; 3. Flatness roll; 4. Laser velocimeter; 5. X-ray thickness gauge; 6. Oil mist cooling device; 7. Initial torque distribution process; 8. Magnetorheological fluid clutch working torque sorting process; 9. Feedback control loop process. Detailed implementation mode

[0026] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0027] A reversible precision copper foil rolling production line includes a reversing mill 1, a coiler 2, a flatness roll 3, a laser velocimeter 4, an X-ray thickness gauge 5, and an oil mist cooling device 6; the mill 1 is a 20-roll reversing mill; the oil mist cooling device 6, the X-ray thickness gauge 5, the laser velocimeter 4, and the flatness roll 3 are symmetrically arranged on both sides of the reversing mill 1 in sequence; the flatness roll 3 collects signals and feeds them back to the reversing mill 1 for flatness control, and at the same time, the signals it collects are also fed back to the coiler 2 for rolling tension control during the rolling process.

[0028] The coiler 2 comprises a frame 2.1, a reel 2.2, a torque synthesis reducer 2.3, a magnetorheological fluid clutch 2.4, a gearbox 2.5, and a motor 2.6; the reel 2.2 is rotatably arranged on the frame 2.1, and its right end is fixedly connected to the torque output shaft 2.3.1 of the torque synthesis reducer 2.3 through a coupling; the torque synthesis reducer 2.3 is provided with three torque input shafts 2.3.2, and the gearbox 2.5 is provided with three output shafts. The three torque input shafts 2.3.2 of the torque synthesis reducer 2.3 are respectively connected to the torque output shaft 2.3.1 of the magnetorheological fluid clutch 2.4 through three magnetorheological fluid clutches 2.5. .4 is connected to the three output shafts of the gearbox 2.5, wherein the torque input shaft 2.3.2 of the torque synthesis reducer 2.3 is connected to the torque output shaft 2.3.1 by gear meshing, with a reduction ratio of 1:1, and the maximum working torque of the magnetorheological fluid clutch 2.4 is 2.0KN*m; the input shaft of the gearbox 2.5 is connected to the motor 2.7; the reversible precision copper foil rolling production line of the present invention uses the magnetorheological fluid clutch 2.4 to directly control the torque of the reel 2.2 to control the rolling tension, and its working principle is: the drive of the reel 2.2 The working torque provided by the three magnetorheological fluid clutches 2.4 arranged in the transmission chain is synthesized and amplified by the torque synthesis reducer 2.3 to provide driving torque for the reel 2.2; the working torque of one magnetorheological fluid clutch 2.4 in the three magnetorheological fluid clutches 2.4 is controlled in turn by the feedback signal of the plate roller 3, so as to accurately control the driving torque of the driving reel 2.2, thereby ensuring that the rolling tension provided by the reel 2.2 remains constant during the precision copper foil rolling production process; the working principle of the rolling tension control system solves the problems of large moment of inertia, slow response speed and low control accuracy of the traditional rolling tension system, so it can greatly improve the control accuracy of the rolling tension during the hot rolling of the precision copper foil, and ensure the stability of the dimensional accuracy of the precision copper foil; it is particularly noted that: for the coiler 2 at the outlet end of the reversible rolling mill, the torque input shaft speed is higher than the torque output shaft speed; for the coiler 2 at the inlet end of the reversible rolling mill, the torque input shaft speed is lower than the torque output shaft speed; the speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is set to be maintained between negative 20-80rpm.

[0029] A precision copper foil rolling production process of a reversible precision copper foil rolling production line, with a starting rolling thickness of 0.05mm and a final rolling thickness of 0.006mm, divided into three rolling processes, and the total processing rate of each rolling process is designed not to exceed 50%; wherein the first rolling process is rolled to 0.025mm, two rolling passes; wherein the second rolling process is rolled to 0.012mm, three rolling passes; wherein the third rolling process is rolled to 0.006mm, three rolling passes; low-temperature annealing treatment is required between each rolling process; negative roll gap, constant tension, and constant rolling speed are used for reciprocating rolling; wherein the control accuracy of the inlet tension and outlet tension of the reversible rolling mill is ≤±0.1%T (T is the tension value);

[0030] Taking the rolling of high copper alloy C19040 foil as an example: the starting rolling thickness is 0.05 mm, the final rolling thickness is 0.006 mm, and it is divided into 3 rolling processes;

[0031] In the first rolling process, it is rolled to 0.025 mm and divided into two rolling passes:

[0032] The processing rate of the first pass is 30.0%, the inlet tension is 1.0 KN, the outlet tension is 1.88 KN, the rolling force is 45 t, and the rolling speed is 300 m / min;

[0033] The processing rate of the second pass is 28.6%, the inlet tension is 1.8 KN, the outlet tension is 2.44 KN, the rolling force is 45 t, and the rolling speed is 350 m / min;

[0034] In the second rolling process, it is rolled to 0.09 mm and divided into three rolling passes:

[0035] The processing rate of the first pass is 25%, the inlet tension is 0.8 KN, the outlet tension is 1.5 KN, the rolling force is 40 t, and the rolling speed is 400 m / min;

[0036] The processing rate of the second pass is 20%, the inlet tension is 1.5 KN, the outlet tension is 2.0 KN, the rolling force is 40 t, and the rolling speed is 450 m / min;

[0037] The processing rate of the third pass is 20%, the inlet tension is 2.0 KN, the outlet tension is 2.4 KN, the rolling force is 40 t, and the rolling speed is 500 m / min;

[0038] In the third rolling process, it is rolled to 0.006 mm and divided into three rolling passes:

[0039] The processing rate of the first pass is 25%, the inlet tension is 0.6 KN, the outlet tension is 1.0 KN, the rolling force is 35 t, and the rolling speed is 500 m / min;

[0040] The processing rate of the second pass is 20%, the inlet tension is 1.2 KN, the outlet tension is 1.6 KN, the rolling force is 35 t, and the rolling speed is 550 m / min;

[0041] The processing rate of the third pass is 16.7%, the inlet tension is 1.5 KN, the outlet tension is 1.9 KN, the rolling force is 35 t, and the rolling speed is 600 m / min.

[0042] A rolling tension control method for a reversible precision copper foil rolling production line, in which the driving torque is synthesized by the actual working torques of several magnetorheological fluid clutches 2.4; the tension signal collected by the shape roller 3 is used to feedback and control the working torque of a single one of the several magnetorheological fluid clutches 2.4 to realize the control and adjustment of the synthesized driving torque, and finally the rolling tension output by the reel 2.2 is controlled by the synthesized torque after control and adjustment. The control process includes the following steps:

[0043] S1. Working speed setting of the magnetorheological fluid clutch 2.4: The working speed of the magnetorheological fluid clutch 2.4 is the rotational speed difference between its torque input shaft and torque output shaft; for the coiler 2 at the outlet end of the reversible rolling mill 1, the rotational speed of the torque input shaft is higher than that of the torque output shaft, and the rotational speed difference between the torque input shaft and torque output shaft of the magnetorheological fluid clutch 2.4 is set to be maintained at +30 rpm. At this time, the reel 2.2 in the coiler 2 is driven to rotate by the motor 2.6, and the driving torque of the reel 2.2 is controlled by the magnetorheological fluid clutch 2.4; for the coiler 2 at the inlet end of the reversible rolling mill 1, the rotational speed of the torque input shaft is lower than that of the torque output shaft, and the rotational speed difference between the torque input shaft and torque output shaft of the magnetorheological fluid clutch 2.4 is set to be maintained at -30 rpm. At this time, the reel 2.2 in the coiler 2 is driven to rotate by the rolled copper foil, and the reel 2.2 provides a resistance torque, and the magnitude of the resistance torque is controlled by the actual working torque of the magnetorheological fluid clutch 2.4. At this time, the motor 2.6 actually operates in the braking mode;

[0044] S2. Working torque distribution of the magnetorheological fluid clutch 2.4: Its initial working torque is evenly distributed to several magnetorheological fluid clutches 2.4 according to the actual working torque required by the reel 2.2. The calculation formula is:

[0045] Mci = Mj / I * n......(1)

[0046] Mj = T * Rj......(2)

[0047] Where: Mci is the torque distributed to a single magnetorheological fluid clutch 2.4; Mj is the actual working torque required by the reel 2.2; I is the transmission ratio between the output shaft of the magnetorheological fluid clutch 2.4 and the reel 2.2; n is the number of magnetorheological fluid clutches 2.4; T is the rolling tension; Rj is the outer diameter of the copper strip coil on the reel 2.2;

[0048] S3. Working torque control of the magnetorheological fluid clutch 2.4: The working torques of several magnetorheological fluid clutches 2.4 are formed into a PID control by the tension signal collected by the shape roller 3; during the feedback control process, only one of several magnetorheological fluid clutches 2.4 is adjusted and controlled for the working torque; a threshold value is set for the torque cumulative adjustment value of a magnetorheological fluid clutch 2.4; when the torque cumulative adjustment value of the magnetorheological fluid clutch 2.4 being feedback-controlled reaches or exceeds the set threshold value, the feedback control process starts to perform feedback control on another magnetorheological fluid clutch 2.4 according to the set order; and so on. During the entire feedback control process, the feedback control of each magnetorheological fluid clutch 2.4 is realized;

[0049] It should be noted that during the rolling tension control process of the reversible precision copper foil rolling production line, the control of the rotational speed of the reel 2.2 is actually also included. Its control structure and method are basically the same as those of the prior art, and will not be elaborated in detail here. The difference lies in that for the control of the rotational speed of the reel 2.2 of the coiler 2 at the outlet end of the reversible rolling mill 1, it should be appropriately increased based on the calculated motor rotational speed; for the control of the rotational speed of the reel 2.2 of the coiler 2 at the inlet end of the reversible rolling mill 1, it should be appropriately decreased based on the calculated motor rotational speed; ensure that the rotational speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is maintained between 20 - 80 rpm. Usually, to reduce the heat generation of the magnetorheological fluid clutch 2.4 during operation, the rotational speed difference between the torque input shaft and the torque output shaft is set near the lower limit, usually set at 30 rpm.

[0050] For example, when the precision copper foil is rolled in the first pass of the first rolling process at a speed of 300 m / min. Assume that at a certain stage during the rolling process, the coil diameter of the reel 2.2 at the inlet section of the reversible rolling mill 1 is 2 m, and the coil diameter of the reel 2.2 at the outlet section of the reversible rolling mill 1 is 1.5 m. The calculated rotational speed of the reel 2.2 at the inlet section of the reversible rolling mill 1 is 30.39 rpm, and the rotational speed of the reel 2.2 at the outlet section of the reversible rolling mill 1 is 43.428 rpm.

[0051] According to the 1:1 reduction ratio between the torque input shaft 2.3.2 and the torque output shaft 2.3.1 of the torque synthesis reduction gear 2.3, the rotational speed of the torque input shaft 2.3.2 of the torque synthesis reduction gear 2.3 of the coiler 2 at the inlet section of the reversible rolling mill 1 is 30.39 rpm. According to the rotational speed difference of 30 rpm between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4, the rotational speed of the torque input shaft of the magnetorheological fluid clutch 2.4 is 0.39 rpm. Assume that the reduction ratio of the gearbox 2.5 is 10, then the finally calculated rotational speed of the motor 2.6 of the coiler 2 at the inlet section of the reversible rolling mill 1 is 39 rpm.

[0052] Similarly, according to the 1:1 reduction ratio between the torque input shaft 2.3.2 and the torque output shaft 2.3.1 of the torque synthesis reduction gear 2.3, the rotational speed of the torque input shaft 2.3.2 of the torque synthesis reduction gear 2.3 of the coiler 2 at the outlet section of the reversible rolling mill 1 is 43.428 rpm. According to the rotational speed difference of 30 rpm between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4, the rotational speed of the torque input shaft of the magnetorheological fluid clutch 2.4 is 73.428 rpm. Assume that the reduction ratio of the gearbox 2.5 is 10, then the finally calculated rotational speed of the motor 2.6 of the coiler 2 at the outlet section of the reversible rolling mill 1 is 734.28 rpm.

[0053] For the rolling tension control process of the reversible precision copper foil rolling production line, please refer to the attached Figure 4, in the rolling tension control process, it actually includes the initial torque distribution process 7, the working torque sorting process 8 of the magnetorheological fluid clutch 2.4, and the feedback control loop process 9; still taking the first pass rolling of precision copper foil in the first rolling process as an example below, the control process of the rolling tension of precision copper foil during the foil rolling process is described, and its rolling parameters are as follows:

[0054] The thickness before rolling is 0.05 mm, the processing rate of the first pass is 30.0%, the inlet tension is 1.0 KN, the outlet tension is 1.88 KN, the rolling force is 45 t, and the rolling speed is 300 m / min; the control accuracy range of the inlet tension and the outlet tension is ±0.1%; the coiler diameter at the inlet section of the reversible mill 1 is 2.0 m, and the coiler diameter at the outlet end of the reversible mill 1 is 1.5 m;

[0055] The parameters of the magnetorheological fluid clutch 2.4 are as follows: the maximum working torque is 2.0 KN·m, and the starting torque (in the non-controlled state) is 0.01 KN·m; for the convenience of description, it is assumed that the control current and the working torque are linearly related (actually non-linear), and its linear coefficient is 0.25 KN·m / A, and the control accuracy of the working current is 2.0 mA;

[0056] The working torque distribution of the magnetorheological fluid clutch 2.4 of the coiler 2 at the inlet section of the reversible mill 1 is as follows: the actual working torque of the reel 2.2 is: Mj = T * Rj = 1.0 * 1.0 = 1.0 KN·m, and the average working torque distributed to each magnetorheological fluid clutch 2.4 is Mci = Mj / I * n = 1 / (3 * 1) = 0.333 KN·m. Therefore, the working current of each magnetorheological fluid clutch 2.4 is 1.292 A; the cumulative torque adjustment threshold of each magnetorheological fluid clutch 2.4 is set to 0.01 KN·m;

[0057] The three magnetorheological fluid clutches 2.4 of the coiler 2 at the inlet section are assumed to be A, B, and C respectively. Because their initial working torques are evenly distributed, their random sorting order is A, B, C;

[0058] During the rolling process, the diameter of the coil on the reel 2.2 gradually decreases while the tension in the entry section remains constant. Therefore, the actual working torque of the magnetorheological fluid clutch 2.4 needs to be continuously controlled to decrease. Otherwise, the tension in the entry section will increase. When there is a deviation between the actual tension value detected by the shape roller 3 at the set period and the target control value of 1.0 KN, the control system outputs a feedback control signal through PID control operation. The feedback control signal is introduced into the reel tension control process. First, the control direction of the feedback signal is judged (positive for increasing the working torque, negative for decreasing the working torque). Then, in the order of A, B, C of the magnetorheological fluid clutch 2.4 that has been scheduled, the working torque of the magnetorheological fluid clutch 2.4A is controlled to decrease. In each feedback control loop process 9 cycle, it is necessary to judge whether the cumulative torque adjustment value of the magnetorheological fluid clutch 2.4A exceeds the set threshold of 0.01 KN*m. If it does not exceed, it enters the feedback control loop of the next cycle. When in subsequent control loops, the cumulative torque adjustment value of the magnetorheological fluid clutch 2.4A exceeds the set threshold of 0.01 KN*m, it re-enters the working torque sorting process 8, and the three magnetorheological fluid clutches 2.4A, B, C are sorted again according to the torque size. The sorting result is B, C, A (since the working torque of A is the smallest, it is ranked third, and the sorting of B and C is randomly generated).

[0059] After the working torque sorting process 8 of the magnetorheological fluid clutch 2.4 ends, it re-enters the feedback control loop process 9. In the new feedback control loop process 9, the working torque of the magnetorheological fluid clutch 2.4B will be continuously controlled by reverse feedback. After several feedback control loop processes 9, the cumulative torque adjustment value of the magnetorheological fluid clutch 2.4B will exceed the set threshold of 0.01 KN*m. At this time, it re-enters the working torque sorting process 8, and the three magnetorheological fluid clutches 2.4A, B, C are sorted again according to the torque size. The sorting result is C, A, B (since the working torques of A and B are equal, the sorting result may be C, B, A, and the sorting of A and B is randomly generated).

[0060] With the repeated execution of the above working torque sorting process 8 and the feedback control loop process 9 until the first pass of the first rolling process of the precision copper foil ends; during this process, under the control of the rolling tension control process of the double-precision copper foil rolling production line, the entry tension is always stably controlled at 1.0 KN and remains unchanged.

[0061] Analysis of the entrance tension control accuracy: The working current control accuracy of the magnetorheological fluid clutch 2.4 is 2.0 mA. That is, in a feedback control cycle process 9, the change in the working torque of the magnetorheological fluid clutch 2.4 is 0.0005 KN*m, and the maximum change in the working torque of the reel 2.2 caused by it is 0.0005 KN*m. Calculated based on the maximum coil diameter of 2200 mm, the maximum change in the rolling tension finally caused is 0.00045 KN, and its control accuracy is 0.045%, which is less than the control accuracy requirement of 0.1% for the entrance section tension in the first pass of the precision copper foil in the first rolling process;

[0062] The working torque distribution of the magnetorheological fluid clutches 2.4 of the coiler 2 in the exit section of the reversible rolling mill 1 is as follows: The actual working torque of the reel 2.2 is: Mj = T * Rj = 1.88 * 0.75 = 1.41 KN*m. The average working torque distributed to each magnetorheological fluid clutch 2.4 is Mci = Mj / I * n = 1.41 / (3 * 1) = 0.47 KN*m. Therefore, the working current of each magnetorheological fluid clutch 2.4 is 1.84 A; The cumulative torque adjustment threshold of each magnetorheological fluid clutch 2.4 is set to 0.01 KN*m;

[0063] The three magnetorheological fluid clutches 2.4 of the coiler 2 in the exit section are assumed to be A, B, and C respectively. Because their initial working torques are evenly distributed, their random order after sorting is A, B, C;

[0064] During the rolling process, the coil diameter on the reel 2.2 gradually increases, and the exit section tension remains unchanged. Therefore, the actual working torque of the magnetorheological fluid clutch 2.4 needs to be continuously increased to control, otherwise the exit section tension will decrease; When the actual tension value detected by the shape roller 3 at the set period deviates from the target control value of 1.88 KN, the control system outputs a feedback control signal through PID control operation. The feedback control signal is introduced into the reel tension control process. First, the control direction of the feedback signal is judged (positive for increasing the working torque, negative for decreasing the working torque), and then, in accordance with the arranged order of the magnetorheological fluid clutches 2.4 of A, B, C, the magnetorheological fluid clutch 2.4C is controlled to increase the working torque; In each feedback control cycle process 9 period, it is necessary to judge whether the torque cumulative adjustment value of the magnetorheological fluid clutch 2.4C exceeds the set threshold of 0.01 KN*m. If it does not exceed, it enters the feedback control cycle of the next period; When in the subsequent control cycle, the torque cumulative adjustment value of the magnetorheological fluid clutch 2.4C exceeds the set threshold of 0.01 KN*m, it re-enters the working torque sorting process 8, and the three magnetorheological fluid clutches 2.4A, B, C are sorted again according to the torque magnitude. The sorting result is C, A, B (because the working torque of C is the largest, so it is ranked first, and the sorting of A and B is randomly generated);

[0065] After the working torque sorting process 8 of the magnetorheological fluid clutch 2.4 ends, it re-enters the feedback control loop process 9. In the new feedback control loop process 9, positive feedback control of the working torque of the magnetorheological fluid clutch 2.4B will be continuously carried out; after several feedback control loop processes 9, the cumulative torque adjustment value of the magnetorheological fluid clutch 2.4B will exceed the set threshold of 0.01 KN*m. At this time, it re-enters the working torque sorting process 8 to re-sort the three magnetorheological fluid clutches 2.4A, B, and C according to the torque magnitude. The sorting result is B, C, A (since the working torques of B and C are equal, the sorting result may also be C, B, A, and the sorting of B and C is randomly generated);

[0066] With the repeated execution of the above-mentioned working torque sorting process 8 and the feedback control loop process 9 until the first pass of the first rolling process of the precision copper foil ends; during this process, under the control of the rolling tension control process of the precision copper foil rolling production line, the outlet tension is always stably controlled at 1.88 KN and remains unchanged;

[0067] Analysis of the outlet tension control accuracy: The working current control accuracy of the magnetorheological fluid clutch 2.4 is 2.0 mA. That is, in a feedback control loop process 9, the change in the working torque of the magnetorheological fluid clutch 2.4 is 0.0005 KN*m, and the maximum change in the working torque of the reel 2.2 caused by it is 0.0005 KN*m. Calculated based on the maximum coil diameter of 2200 mm, the final maximum change in the rolling tension is 0.00045 KN, and its control accuracy is 0.0239%, which is less than the control accuracy requirement of 0.1% for the outlet section tension in the first pass of the first rolling process of the precision copper foil.

[0068] For the initial working torque distribution of the magnetorheological fluid clutch 2.4, the torque value evenly distributed to several magnetorheological fluid clutches 2.4 according to the actual working torque required by the reel 2.2 is used as the intermediate value, and the torque values are randomly distributed to several magnetorheological fluid clutches 2.4 in the form of an arithmetic sequence; the difference of the arithmetic sequence is the cumulative torque value that a magnetorheological fluid clutch 2.4 is allowed to adjust.

[0069] The parts not detailed in the present invention are prior art.

Claims

1. A rolling tension control method for a reversible precision copper foil rolling production line, characterized in that: The reversible precision copper foil rolling production line comprises: a reversible rolling mill (1), a coiler (2), a plate-shaped roller (3), a laser velocimeter (4), an X-ray thickness gauge (5), and an oil mist cooling device (6); the reversible rolling mill (1) is a 20-roller reversible rolling mill; the oil mist cooling device (6), the X-ray thickness gauge (5), the laser velocimeter (4), and the plate-shaped roller (3) are symmetrically arranged on both sides of the reversible rolling mill (1); the plate-shaped roller (3) collects signals and feeds them back to the reversible rolling mill (1) for plate shape control, and at the same time, the collected signals are also fed back to the coiler (2) for tension control during the rolling process; The coiler (2) comprises a frame (2.1), a reel (2.2), a torque synthesis reducer (2.3), a magnetorheological fluid clutch (2.4), a gearbox (2.5), and a motor (2.6); the reel (2.2) is rotatably arranged on the frame (2.1), and the reel (2.2) and the motor (2.6) are connected in transmission via the torque synthesis reducer (2.3), the magnetorheological fluid clutch (2.4), and the gearbox (2.5) in sequence; The working torque of a single one of the plurality of magnetorheological fluid clutches (2.4) is controlled by feedback of the tension signal collected by the plate-shaped roller (3), thereby achieving precise control of the rolling tension provided by the reel (2.2); The synthetic driving torque is controlled by controlling the working torque of a plurality of magnetorheological fluid clutches (2.4); the rolling tension output by the reel (2.2) is controlled by the synthetic driving torque; the control process includes the following steps: S1. Setting of the working speed of the magnetorheological fluid clutch (2.4): The working speed of the magnetorheological fluid clutch (2.4) is the speed difference between the torque input shaft and the torque output shaft; the speed of the torque input shaft of the coiler (2) at the outlet end of the reversible rolling mill (1) is higher than the speed of the torque output shaft; the speed of the torque input shaft of the coiler (2) at the inlet end of the reversible rolling mill (1) is lower than the speed of the torque output shaft; the speed difference between the torque input shaft and the torque output shaft is set to be maintained between 20-80 rpm; S2, distribution of working torque of magnetorheological fluid clutch (2.4): its initial working torque is evenly distributed to a number of magnetorheological fluid clutches (2.4) according to the actual working torque required by the reel (2.2), and the calculation formula is: Mci=Mj / I*n ......(1) Mj=T*Rj ......(2) Wherein: Mci is the torque distributed by a single magnetorheological fluid clutch (2.4); Mj is the torque required for the actual operation of the reel (2.2); I is the transmission ratio between the output shaft of the magnetorheological fluid clutch (2.4) and the reel (2.2); n is the number of magnetorheological fluid clutches (2.4); T is the rolling tension; Rj is the outer diameter of the copper strip roll on the reel (2.2); S3, magnetorheological fluid clutch (2.4) working torque control: the working torque of a plurality of magnetorheological fluid clutches (2.4) is PID-controlled by means of the tension signal feedback collected by the plate roller (3); during the feedback control process, only one of the plurality of magnetorheological fluid clutches (2.4) is subjected to working torque adjustment control; a threshold is set for the torque accumulation adjustment value of a magnetorheological fluid clutch (2.4); when the torque accumulation adjustment value of the magnetorheological fluid clutch (2.4) under feedback control reaches or exceeds the set threshold, the feedback control process starts to feedback control another magnetorheological fluid clutch (2.4) in a set sequence; and so on, during the entire feedback control process, feedback control of each magnetorheological fluid clutch (2.4) is achieved.

2. The rolling tension control method of the reversible precision copper foil rolling production line according to claim 1, characterized in that: torque The composite reducer (2.3) comprises a torque output shaft (2.3.1) and a plurality of torque input shafts (2.3.2), the torque output shaft (2.3.1) and the plurality of torque input shafts (2.3.2) being meshed and connected via gears and having a fixed reduction ratio; the gearbox (2.5) is provided with output shafts having the same number as the torque input shafts (2.3.2) of the torque composite reducer (2.3); one end of the reel (2.2) is fixedly connected to the torque output shaft (2.3.1) of the torque composite reducer (2.3) via a coupling; The plurality of torque input shafts (2.3.2) of the torque synthesis reducer (2.3) and the plurality of output shafts of the gearbox (2.5) are respectively connected by transmission through a plurality of magnetorheological fluid clutches (2.4), and the input shaft of the gearbox (2.5) is connected by transmission with the output shaft of the motor (2.6); the working torque of the plurality of magnetorheological fluid clutches (2.4) is synthesized into a larger driving torque through the torque synthesis reducer (2.3), driving the reel (2.2) to rotate, and the rolling tension output by the reel (2.2) is ultimately controlled by controlling the synthesized driving torque.

3. The rolling tension control method of the reversible precision copper foil rolling production line according to claim 1, characterized in that: The initial working torque of the magnetorheological fluid clutch (2.4) is distributed, with the torque value of the actual working torque of the reel (2.2) evenly distributed to a plurality of magnetorheological fluid clutches (2.4) as the middle value, and the torque value is randomly distributed to a plurality of magnetorheological fluid clutches (2.4) in the form of an arithmetic progression; the difference of the arithmetic progression is a torque accumulation value that a magnetorheological fluid clutch (2.4) is allowed to adjust.

4. A precision copper foil rolling production process based on the rolling tension control method of the reversible precision copper foil rolling production line described in claim 1, characterized in that: The starting rolling thickness is 0.05 mm, the final rolling thickness is 0.006 mm, and it is divided into 3 rolling processes, each of which has a total of 3-5 rolling passes; negative roll gap, constant tension, and constant rolling speed are used for reciprocating rolling; the inlet tension and outlet tension control accuracy of the reversible rolling mill (1) is ≤±0.1%T, where T is the tension value.

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