A forming method for a cathode roll cylinder

Abstract

A forming method for the roller of a cathode roller, using a steel cylinder obtained by finish machining as the mother plate for coiling a copper plate. The copper plate is tightly coiled around the outer circumference of the steel cylinder. Multiple sets of pressure rollers provide a flexible pressing force through springs, causing the copper plate to undergo elastoplastic deformation and closely adhere to the outer circumference surface of the steel cylinder. After the copper plate is coiled around the outer circumference surface of the steel cylinder, based on the fixation of the copper plate to the outer circumference of the steel cylinder, the gap is welded to achieve the tight compounding of the copper-steel cylinder, and the weld seam is heat-treated to reduce stress and improve the dimensional stability of the copper cylinder. The present invention overcomes the deficiencies in the traditional method of coiling and welding a copper-steel composite plate into a copper-steel cylinder, such as poor forming roundness, inability to perform uniform precision turning after coiling and welding the copper-steel cylinder, and large differences in the remaining thickness of the copper layer on the copper cylinder after precision turning, thus improving the conductivity of the titanium-copper-steel composite roller core. It realizes the coiling control of the copper plate, improves the uniformity of the thickness of the copper cylinder in the cathode roller, and improves the conductive uniformity of the copper cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of cathode rollers, and particularly to a copper plate rolling and forming method for forming a roller barrel of a cathode roller. Background Art

[0002] With the rapid development of global new energy vehicles, 5G communications, big data centers, and artificial intelligence technologies, the demand for electrolytic copper foil has increased rapidly. Moreover, due to the increasingly high performance requirements for copper foil in power lithium batteries and energy storage lithium batteries, the copper foil thickness is developing towards a thinner direction, which poses higher requirements for the cathode rollers used in the production of electrolytic copper foil.

[0003] Since the production of electrolytic copper foil is carried out by a roller-type continuous electrolysis method. The principle is to immerse the cathode roller in a copper sulfate electrolytic solution and then pass a direct current power supply with a low voltage and a large current to deposit copper ions in the electrolytic solution onto the titanium surface of the cathode roller to form a copper foil. Then, the formed copper foil is peeled off and wound from the surface of the cathode roller by the rotation of the cathode roller, and then the surface treatment of the copper foil is further carried out to form a copper foil product. Therefore, the cathode roller for high-precision lithium battery foil is the core key component directly affecting the output and quality of copper foil.

[0004] Since the cathode roller plays a decisive role in copper foil production, the requirements for it are quite high: First, to increase the output of copper foil, the larger the roller surface diameter, the better. The diameter of the existing cathode rollers for high-precision lithium battery foil has reached φ3000mm; second, good electrical conductivity is required, and there should be no local heating points due to poor local electrical conductivity; and the requirements for the roundness, straightness, and surface roughness of the surface are quite high; the surface is required to be resistant to the corrosion of the electrolytic solution for a long time, and the overall balance and the overall weight are required to be as light as possible. Currently, the structure of the cathode roller for high-precision lithium battery foil adopts a three-layer composite structure of titanium, copper, and steel; that is, the outer circle is wrapped with titanium, the middle layer is made of copper for conduction, and the inner layer is made of steel as the skeleton.

[0005] Currently, in the copper-steel structure of the cathode roller, copper and steel are compounded into a copper-steel composite plate by explosion welding, and then rolled into a cylinder. After installing the side plates and the core rotating shaft and turning the circle, a titanium cylinder is sleeved to form a cathode roller. In the process of manufacturing, due to the large diameter of the cylinder, when rolling the copper-steel composite plate, the roundness tolerance can only reach ≥4mm, so the thickness of the copper cannot be guaranteed to be uniform during the turning process, which does not meet the requirements, resulting in local poor electrical conductivity and local heating points. On the other hand, due to the special forming process of the copper-steel composite plate, the price of the copper-steel composite plate is extremely high. In this way, there are quite a lot of uncertain factors in design and manufacturing, which are difficult to ensure the manufacturing quality of the cathode roller, thus seriously affecting the quality and output of the produced copper foil. Summary of the Invention

[0006] To overcome the problem of uneven thickness of the copper cylinder in the existing technology and improve the electrical conductivity uniformity of the copper cylinder, the present invention proposes a forming method for the roller of the cathode roller.

[0007] The forming process of the roller of the cathode roller proposed by the present invention is as follows:

[0008] Step 1: Determine the length of the copper plate:

[0009] Calculate the length L of the copper plate to be rolled.

[0010] Step 2: Tooling preparation:

[0011] In the tooling, the arc-shaped frame retreats, the steel cylinder is hoisted onto the bearing seat of the fixed frame, and the coaxiality between the motor and the axis of rotation of the steel cylinder of the cathode roller is adjusted to be ≤ 0.05 mm and fastened securely; when the arc-shaped frame moves forward, the circumferential surfaces of the pressing rollers are closely attached to the outer surface of the steel cylinder, and the parallelism between each pressing roller and the steel cylinder of the cathode roller is adjusted so that the parallelism is ≤ 0.05 mm, and each group of pressing rollers is fastened securely.

[0012] The steel cylinder of the cathode roller in the tooling is fixedly connected to the motor through a rotating shaft, so that the steel cylinder of the cathode roller is driven to rotate by the motor. The driving power of the motor is 4 KW, and the rotation speed of the steel cylinder of the cathode roller is 1 r / min.

[0013] Step 3: Processing of the copper plate:

[0014] The processing of the copper plate includes processing welding grooves and a plurality of connecting holes on the two short sides of the copper plate respectively. The copper plate before curling is obtained.

[0015] Step 4: Curling of the copper plate:

[0016] The curling of the copper plate mainly includes four working steps: fixing the starting end of the copper plate, adjusting the pressing rollers, curling the copper plate, and fixing the terminating end of the copper plate. Specifically:

[0017] Ⅰ Take one short side of the copper plate as the starting end of curling. Fix the starting end on the outer circumferential surface of the steel cylinder by screws.

[0018] Ⅱ Adjust the springs on the bearing seats on both sides of the pressing rollers so that the circumferential surfaces of the pressing rollers are closely attached to the outer surface of the steel cylinder. The compression amount of the spring is 25 - 50 mm, and the compression force of each spring is 2345.8 N - 4691.6 N.

[0019] 3. The forming method of the roller of the cathode roller according to claim 1, wherein the compression amount of the spring is 25 - 50 mm, and the compression force of each spring is 2345.8 N - 4691.6 N. Make the springs at both ends of each pressing roller produce a compression amount of 24 mm; when the copper plate enters during curling, the compression amount of the spring is 30 mm, generating a pressing force of 2814.96 N, and each pressing roller receives a pressing force of 5629.92 N from the spring.

[0020] Ⅲ Start the motor, electrically drive the cathode roller steel cylinder to rotate, and drive the copper plate into the first pressure roller A. When the copper plate passes through each pressure roller, the real-time compression amount of each pressure roller spring is 30 mm, generating a pressing force of 2814.96 N on the copper plate. When the copper plate enters each pressure roller, it enters the pressure roller along the welding groove, and the welding groove plays a guiding role. The copper plate first passes through the first pressure roller and is stably curled on the outer circumference of the cathode roller steel cylinder; the rotation speed of the cathode roller is 1 r / min. Under the combined action of the driving force generated by the rotation of the cathode roller and the frictional force generated by the pressing force of the pressure roller, the copper plate undergoes elastoplastic deformation, becomes tense and tightly curls on the outer circumferential surface of the cathode roller steel cylinder. As the cathode roller rotates, the copper plate sequentially enters the second pressure roller, the third pressure roller, the fourth pressure roller, the fifth pressure roller and the sixth pressure roller. Under the action of each pressure roller, the copper plate gradually winds around the outer circumferential surface of the steel cylinder and becomes a circular cylinder, obtaining a semi-finished steel cylinder.

[0021] Ⅳ Under the state where the sixth pressure roller is pressed, fix the copper cylinder to the steel cylinder through bolts at the termination end of the copper plate to prevent the copper plate from loosening for copper plate welding. Obtain a semi-finished copper cylinder.

[0022] When the copper plate is curled into a circle, the radial gap between the copper plate and the outer circumference of the steel cylinder ≤ 0.05 mm, that is, the gap between the surface of the copper plate and the outer surface of the steel cylinder ≤ 0.05 mm.

[0023] Step Five: Welding:

[0024] Weld the butt joint of the semi-finished copper cylinder.

[0025] Remove the screws fixing the copper plate in the way of spacing 1 screw.

[0026] Conduct heat stress relief treatment on the weld seam at the welded part of the copper cylinder; the heating temperature is 150 °C and the heat preservation time is 20 min.

[0027] After the copper plate is curled and welded, the arc-shaped frame withdraws from the working position, and the cathode roller copper-steel cylinder is lifted off the fixing frame. Obtain the copper-steel composite cathode roller copper-steel cylinder.

[0028] During the welding, use heat preservation cotton to insulate the outer circumferential surface of the semi-finished copper cylinder. After welding, insulate the weld seam so that the temperature of the weld seam drops to ≤ 25 °C at a speed of ≤ 8 °C / min to ensure the accuracy of the copper plate curling and welding.

[0029] After the copper plate is curled and welded, the copper plate curling on the outer circumference of the steel cylinder ends, forming a copper cathode roller copper-steel cylinder. The arc-shaped frame withdraws from the working position, and the cathode roller copper-steel cylinder is lifted off the fixing frame. Obtain the copper-steel composite cathode roller copper-steel cylinder.

[0030] Step Six: Machining of the outer circumference of the cathode roller copper-steel cylinder:

[0031] Precision turning of the outer circumference of the cathode roller copper-steel cylinder.

[0032] During turning, the rotational speed of the cathode roller is 15 rpm, the axial movement is 3.0 mm / min, and the single-side cutting amount of the outer circle of the copper cylinder is 0.6 mm; after precision turning, the circular runout of the outer circle of the copper-steel cylinder of the cathode roller with respect to the rotating shaft is 0.04 mm, the straightness of the outer circle of the copper-steel composite cylinder is 0.04 mm, the surface roughness Ra of the copper-steel composite cylinder is 3.2, and the difference in copper layer thickness ≤ 0.1 mm.

[0033] Step Seven: Thermal assembly with the titanium cylinder:

[0034] Thermally assemble the precision-turned copper-steel cylinder of the cathode roller with the titanium cylinder. There is an interference fit between the copper-steel cylinder of the cathode roller and the titanium cylinder, with an interference amount of 4 mm; place the titanium cylinder in a pit-type resistance furnace for thermal assembly; obtain a titanium-copper-steel composite cathode roller.

[0035] The temperature of the thermal assembly ≥ 550 °C, and the heat preservation time is 30 min.

[0036] The present invention also proposes a tooling used in the coiling of copper plates, including a rotating shaft, a plurality of pressing rollers, a fixing frame, and an arc-shaped frame; the arc-shaped frame includes a first arc-shaped frame and a second arc-shaped frame. Each arc-shaped frame is respectively installed on the fixing frame, and the concave arc surfaces of the two arc-shaped frames face each other. At the upper ends of the two brackets of the fixing frame, there are respectively steel cylinder bearing seats, forming a rotating shaft support member in the axial direction of the rotating shaft; both ends of the rotating shaft 1 in the steel cylinder assembly are respectively installed in the steel cylinder bearing seats. The pressing rollers are six, namely the first pressing roller, the second pressing roller, the third pressing roller, the fourth pressing roller, the fifth pressing roller, and the sixth pressing roller. The center lines of each pressing roller are parallel to the center line of the outer circle of the steel cylinder, and the parallelism ≤ 0.10 mm.

[0037] The steel cylinder assembly is a workpiece for coiling and compounding with the copper plate, and is also a carrier during the coiling of the copper plate. Both ends of the rotating shaft 1 in the steel cylinder assembly are installed in the steel cylinder bearing seats through bearings.

[0038] Each of the arc-shaped frames is respectively fixed on the arc-shaped frame mounting plate on the fixing frame, symmetrically distributed on both sides of the circumference of the steel cylinder, and a space circle is formed by the inner arc surfaces of the two arc-shaped frames. On the inner arc surfaces of each arc-shaped frame, there are three pressing rollers, and both ends of the three pressing rollers are respectively fixed on the inner surfaces of the respective arc-shaped support plates. The circumferential surfaces of each pressing roller are closely attached to the outer surface of the steel cylinder and are pressed tightly by springs.

[0039] The three pressing rollers on the first arc-shaped frame are, clockwise from top to bottom, the first pressing roller, the second pressing roller, and the third pressing roller; the three pressing rollers on the second arc-shaped frame are, counterclockwise from top to bottom, the fourth pressing roller, the fifth pressing roller, and the sixth pressing roller; and the first pressing roller corresponds to the fourth pressing roller in terms of position on the space circle, the second pressing roller corresponds to the fifth pressing roller in terms of position on the space circle, and the third pressing roller corresponds to the sixth pressing roller in terms of position on the space circle. The center lines of each of the pressing rollers are respectively parallel to the center line of the steel cylinder 14.

[0040] The circumferential positions of the three pressure rollers located on the second arc-shaped frame are as follows: the included angle β2 between the spatial connection line between the center of the second pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10 to 15°; the included angle β1 between the spatial connection line between the center of the first pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40 to 55°; the included angle β3 between the spatial connection line between the center of the third pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20 to -30°.

[0041] The circumferential positions of the three pressure rollers located on the second arc-shaped frame are as follows: the included angle β5 between the spatial connection line between the center of the fifth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10 to 15°; the included angle β4 between the spatial connection line between the center of the fourth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40 to 55°; the included angle β6 between the spatial connection line between the center of the sixth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20 to -30°.

[0042] The upper surface of the fixed frame is respectively used for installing the steel cylinder bearing seats. There are arc-shaped frame mounting plates on the outer surfaces of both sides of the fixed frame; there are chutes on the arc-shaped frame mounting plates, and each chute is perpendicular to the center line of the arc-shaped frame where it is located. Each arc-shaped frame slider is respectively installed in each chute, so that each arc-shaped frame can move horizontally along the chute.

[0043] The pressure roller bearing seat is pressed by a spring. The spring is sleeved on the screw rod, one end presses on the pressure roller bearing seat, and the other end of the screw rod passes through the spring backing plate and is installed on the fixed plate of the first arc-shaped frame or the fixed plate of the second arc-shaped frame.

[0044] There are multiple spring seats. Each spring seat includes a spring backing plate and two screw rods; there are through holes for installing the screw rods at both ends of each spring backing plate. The upper ends of the two screw rods respectively pass through the screw holes on the arc-shaped frame fixed plate and the screw holes on the spring backing plate, and the lower ends respectively pass through the screw holes on the pressure roller bearing seat, so as to fixedly connect the pressure roller and the arc-shaped frame. Each of the springs is sleeved on each screw rod and is located between the spring backing plate and the pressure roller bearing seat.

[0045] The cathode roller for lithium battery foil involved in the present invention has a three-layer composite structure of titanium, copper, and steel. The cathode roller titanium-copper-steel composite structure has a cylindrical outer shape and successively includes a cylindrical shape composed of a titanium layer, a copper layer, and a steel layer from the outside to the inside; its characteristics are: the titanium layer, the copper layer, and the steel layer are all cylindrical structures, the copper layer located in the middle layer is a copper cylinder with high-precision winding, the roundness of the copper cylinder is ≤0.6 mm; the copper cylinder is wound on the outer surface of the steel cylinder; the titanium cylinder is sleeved on the outer circumferential surface of the copper cylinder together with the rotating shaft.

[0046] The present invention uses a steel cylinder obtained by finish machining as the mother plate for coiling the copper plate, coils the copper plate tightly around the outer circumference of the steel cylinder, and multiple sets of pressure rollers provide a flexible pressing force through springs, causing the copper plate to undergo elastoplastic deformation and closely adhere to the outer surface of the steel cylinder. After the copper plate is coiled around the outer circumference of the steel cylinder, based on the fixation of the copper plate to the outer circumference of the steel cylinder, the gap is welded to achieve the tight compounding of the copper-steel cylinder, and the weld seam is heat-treated to reduce stress and improve the dimensional stability of the copper cylinder.

[0047] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The proposed copper plate coiling and forming method with a diameter ≥ 1000 mm improves the situation that when the traditional copper-steel composite plate is coiled and welded into a copper-steel cylinder, the forming roundness is poor, it is impossible to ensure uniform finish turning of the outer copper cylinder after coiling and welding the copper-steel cylinder, and the remaining thickness difference of the copper layer after finish turning is relatively large, with a thickness difference of 2 - 3 mm, which cannot ensure the uniformity of the conductive copper layer of the copper-steel composite cathode roller core and has a great impact on the conductivity of the high-precision copper-steel composite roller core; through this forming method, the coiling control of the copper plate is realized, the labor intensity of sheet metal rolling is reduced, the labor efficiency is improved, and the labor intensity of the operators is greatly reduced.

[0048] The specific advantages are as follows: 1. The steel cylinder can achieve quite good roundness and straightness after turning, which can ensure the smooth coiling of the copper plate; 2. The copper cylinder is coiled around the outer circumference of the steel cylinder and the outer circumference is finish turned, thus ensuring that the thickness of the copper layer conductive layer is very uniform; 3. In terms of process manufacturing, the manufacturing cost and material cost are greatly reduced and the manufacturing efficiency is improved; 4. The copper cylinder coiled from the copper plate can ensure that the cathode roller has a good repair rate.

[0049] According to the elongation rate of the copper plate coiling, accurately calculate and process the circumferential length of the copper plate, ensure that the coiled copper plate is closely attached to the outer circumference of the steel cylinder through the pressure rollers, and the radial gap ≤ 0.05 mm. Note that the copper plate weld seam is located between the first pressure roller A and the sixth pressure roller F on the entry side. When the coiling of the copper plate is completed, weld the copper plate weld seam. Note that the welding current is controlled at 650 - 700 A, the arc welding voltage is 41 - 44 V, the welding speed is 25 cm / min, the welding wire is SCU1898, the diameter is 3.0 - 4.0 mm, the welding speed is controlled at 0 - 150 cm / min. After welding, use heat-insulating cotton for heat preservation to prevent the generation of cracks after copper welding. The heat preservation time is 30 - 60 min, and the heat-insulating layer is removed after cooling to 20°C. The copper cylinder welded by this method can achieve a roundness control of ≤ 0.3 mm, ensuring the geometric accuracy of the copper cylinder.

[0050] The copper plate selected for this invention is T2 pure copper material, with soft material properties and a hardness ≤ 70 HV. The copper plate is a hot-rolled plate in the O60 state after softening annealing treatment, having good metal fluidity, that is, good plasticity, a tensile strength ≥ 205 MPa, and an elongation after fracture ≥ 30%. Due to being in the softening annealing O60 state, the bending angle can reach 180°, and the inner radius can be as small as 0.5 times the plate thickness. In this invention, the copper plate is bent and rolled along the copper plate rolling fiber direction perpendicular to the rolling direction. The inner curvature fillet radius of the bending and rolling is large, and the rolling radius is generally ≥ R500 mm. The thickness of the copper plate is generally 3 - 12 mm, and the rolling radius is much larger than the plate thickness. When bending and rolling, the bending and rolling are consistent with the copper plate rolling fiber direction, enabling the rolling of such copper plates.

[0051] Principle of the copper plate rolling forming method: Make the metal material undergo elastoplastic deformation under the action of force. Utilize the annealed and softened T2 and its good plasticity. First, fix the copper plate on the outer circumference generatrix of the steel cylinder. The rotation of the steel cylinder drives the copper plate to rotate. Under the action of the pressure perpendicular to the outer circumference of the steel cylinder, the copper plate undergoes elastoplastic deformation, and the copper plate adheres to the outer circumference of the steel cylinder and closely fits on the outer circumference of the steel cylinder. Since the copper plate is on the generatrix of the steel cylinder, the copper plate is in close contact with the steel cylinder and the pressure roller. The copper plate is limited in both the radial inner and outer directions, enabling the copper plate to be closely attached to the outer circumference of the steel cylinder in the generatrix direction of the steel cylinder. And under the action of the frictional force of the pressure roller, the part of the copper plate passing through the pressure roller is closely attached to the steel cylinder, preventing the copper plate that has already been attached to the steel cylinder from loosening.

[0052] This invention can obtain a high-precision copper steel cylinder, thereby improving the precision of the high copper steel cylinder cathode roller. The thickness uniformity of the copper layer on the outer circumference of the copper steel cylinder is greatly improved, and the thickness consistency of the copper layer reaches ≤ 0.3 mm. The fitting gap between the copper layer and the outer surface of the inner steel cylinder is ≤ 0.05 mm, effectively ensuring the thickness uniformity of the copper layer of the copper steel cathode roller, improving the electrical conductivity uniformity of the copper steel cylinder cathode roller, making the produced electrolytic copper foil have good weight uniformity, and enhancing the grade and quality of the copper foil produced by this copper steel cylinder cathode roller. See Table 1. Table 2 shows the deviation of the remaining copper layer thickness after turning the outer circumference of the copper cylinder for any two selected copper steel cylinders. Measure the copper layer thickness in the direction of the outer circumference generatrix every 45° along the circumference, and a total of 8 outer circumference generatrices are measured. Uniformly select 8 points along the width direction. The specific results are shown in Table 1 and Table 2, and the thickness consistency of the copper layer reaches ≤ 0.3 mm.

[0053] Table 1 Copper layer thickness deviation of a certain copper steel cylinder

[0054]

[0055]

[0056] Table 2 Copper layer thickness deviation of a certain copper steel cylinder

[0057]

[0058] By tracking the use effect of the copper-steel cylinder cathode roller with this structure at the customer site, the electrolytic copper foil produced by the copper-steel cathode roller with this structure has good weight uniformity, and the weight deviation ≤ 1.5%. By selecting electrolytic copper foil with a size of 50 mm × 50 mm, one outer circle busbar direction of the electrolytic copper foil is detected every 45° along the circumference, a total of 8 outer circle busbars are detected, and 8 points are evenly selected along the width direction. The specific results are shown in Table 3 and Table 4. The grammage deviation of the electrolytic copper foil ≤ 1.5%, reaching the level of high-grade lithium battery copper foil.

[0059] Table 3 Grammage of electrolytic copper foil produced by a certain copper-steel cylinder cathode roller (6um electrolytic copper foil)

[0060]

[0061]

[0062] Table 4 Grammage of electrolytic copper foil produced by a certain copper-steel cylinder cathode roller (6um electrolytic copper foil)

[0063] Description of the Drawings

[0064] Figure 1 is the front view of the copper plate curling forming device.

[0065] Figure 2 is the B-B cross-sectional view of the copper plate curling forming device.

[0066] Figure 3 is the left view of the copper plate curling forming device.

[0067] Figure 4 is the partial enlarged view M in the B-B cross-sectional view of the copper plate curling forming device.

[0068] Figure 5 is the assembly schematic diagram of the arc-shaped frame.

[0069] Figure 6 is the structural schematic diagram of the first arc-shaped frame.

[0070] Figure 7 is the structural schematic diagram of the second arc-shaped frame.

[0071] Figure 8 is the position schematic diagram of the pressure roller.

[0072] Figure 9 is the flow chart of the present invention.

[0073] In the figure: 1. Rotating shaft; 2. Steel cylinder bearing seat; 3. First arc-shaped frame; 4. Fixed frame; 5. First pressure roller; 6. Second pressure roller; 7. Third pressure roller; 8. Fourth pressure roller; 9. Fifth pressure roller; 10. Sixth pressure roller; 11. Screw; 12. Spring; 13. Spring backing plate; 14. Steel cylinder; 15. Second arc-shaped frame; 16. Pressure roller bearing seat; 17. Copper cylinder; 18. Spring backing plate; 19. Slide block. Specific implementation method

[0074] This embodiment is a method for forming the roller barrel of the cathode roller by using the copper plate curling and forming method. The thickness of the copper plate to be curled is 6 mm, the length is 6232 mm, the diameter after curling of the copper cylinder is 2000 mm, the width is 1400 mm, and the weight is 621 Kg.

[0075] The specific process of this embodiment is as follows:

[0076] Step 1: Determine the length of the copper plate:

[0077] Calculate the length L of the copper plate to be curled. The length of the circumference of the copper cylinder after curling is the length of the copper plate before curling.

[0078] The copper plate to be curled is rectangular. The length L of this copper plate forms the circumference of the copper cylinder, and the width of this copper plate is the axial length of the copper cylinder.

[0079] Determine the copper plate length L through formula (1):

[0080] L = πd - 0.4t - 3 (1)

[0081] In the formula, d is the middle diameter of the copper plate curling, and t is the plate thickness.

[0082] In this embodiment, the copper plate length L = 6255.7 mm.

[0083] Step 2: Tooling preparation:

[0084] The steel cylinder of the cathode roller is connected to the gear or coupling through the rotating shafts 1 on both sides by keys. The gear or coupling is driven by the motor and reducer, thereby driving the rotating shaft 1 to rotate, and the rotating shaft 1 drives the steel cylinder 14 of the cathode roller to rotate. The driving power of the motor is 4 KW, and the rotating speed of the steel cylinder of the cathode roller is 1 r / min.

[0085] The arc-shaped frame retreats, the steel cylinder is hoisted onto the bearing seat of the fixed frame, the coaxiality between the motor and the axis of rotation of the steel cylinder of the cathode roller is adjusted to ≤ 0.05 mm and fastened securely; then the arc-shaped frame moves forward, the circumferential surfaces of each pressure roller are closely attached to the outer surface of the steel cylinder, the parallelism between the 6 groups of pressure rollers and the steel cylinder of the cathode roller is adjusted, the parallelism is ≤ 0.05 mm, and each group of pressure rollers is fastened securely.

[0086] Step 3: Processing of the copper plate:

[0087] Milling process the copper plate according to the determined length L of the copper plate, so that the long side and the short side of the copper plate are perpendicular to each other. After processing, the copper plate becomes a rectangular plate, and the long side of the rectangular plate forms the circumference of the copper cylinder, and the two short sides are butted to form a cylinder. Both short sides of the copper plate have welding grooves of (t - 2)×45°, where t is the thickness of the copper plate; the directions of the grooves at both short sides are the same. When curling, the groove faces outward, which is convenient for welding on the outer side of the outer circle of the copper cylinder after the copper plate curling is completed.

[0088] Process 12 connecting holes of 90° at both short sides of the copper plate respectively. The center lines of each connecting hole are perpendicular to the surface of the copper plate. The distance from the center of each connecting hole to the edge of the short side where it is located is 50mm, and the distance from the edge of the two long sides of the copper plate is also 50mm. Obtain the copper plate before curling.

[0089] The depth of each of the said connecting holes is t / 2; in this embodiment, the depth of the connecting hole is 3mm, and the center of each 90° connecting hole is a φ7 through hole, which is convenient for fixing both ends of the copper plate on the outer circumferential surface of the cathode roller steel cylinder through screws when curling the copper plate; when the curling of the copper plate is completed, tighten the copper plate at the end through screws to prevent the copper plate from loosening, which is convenient for welding the copper plate at the end to form a complete circle.

[0090] Step Four, curling the copper plate:

[0091] The curling of the copper plate mainly includes four working steps: fixing the starting end of the copper plate, adjusting the pressure rollers, curling the copper plate, and fixing the terminating end of the copper plate. Specifically:

[0092] Ⅰ Take one short side of the said copper plate as the starting end of curling. Fix this starting end on the outer circumferential surface of the steel cylinder through screws, and make the side with the welding groove of the short side of the copper plate face outward.

[0093] Ⅱ Adjust the springs on both bearing seats of the pressure rollers so that the circumferential surfaces of each pressure roller closely adhere to the outer surface of the steel cylinder.

[0094] The compression springs are selected as cylindrical helical compression springs, the material is 65Mn, the wire diameter is 2.5mm, the mean diameter of the spring is 18mm, the number of effective turns is 20, the free height H0 = 100mm, the single - turn load is 234.58N, and the compression amount of the spring is adjusted by adjusting the tightness of the adjusting nut to control the pressing force. According to Hooke's law, the pressing force is F, F = KX, where F is the pressing force, K is the stiffness coefficient of the spring, and X is the compression amount of the spring.

[0095] In this embodiment, the compression amount of the spring is 25 - 50mm, and the compression force of each spring is 2345.8N - 4691.6N. Compress the springs at both ends of each pressure roller, and the compression amount is 24mm. When the copper plate enters the curling process, the compression amount of the spring is 30mm, generating a pressing force of 2814.96N, and the pressing force of each pressure roller by the spring is 5629.92N to press the copper plate.

[0096] Ⅲ Start the motor, electrically drive the cathode roller steel cylinder to rotate, and drive the copper plate into the first pressure roller A. When the copper plate passes through each pressure roller, the real-time compression amount of each pressure roller spring is 30 mm, generating a pressing force of 2,814.96 N on the copper plate. When the copper plate enters each pressure roller, it enters the pressure roller along the welding groove, and the welding groove plays a guiding role. The copper plate first passes through the first pressure roller and is stably curled on the outer circumference of the cathode roller steel cylinder; the rotation speed of the cathode roller is 1 r / min. Under the combined action of the driving force generated by the rotation of the cathode roller and the frictional force generated by the pressing force of the pressure roller, the copper plate undergoes elastoplastic deformation, becomes taut and tightly curls on the outer circumferential surface of the cathode roller steel cylinder. As the cathode roller rotates, the copper plate successively enters the second pressure roller, the third pressure roller, the fourth pressure roller, the fifth pressure roller and the sixth pressure roller. Under the action of each pressure roller, the copper plate gradually winds around the outer circumferential surface of the steel cylinder and becomes a circular cylinder, obtaining a semi-finished steel cylinder.

[0097] When the copper plate enters each pressure roller, it enters the pressure roller along the welding groove, and the welding groove plays a guiding role. Under the pressing force of the pressure roller, the copper plate undergoes elastoplastic deformation and closely adheres to the outer circumferential surface of the steel cylinder. Since the pressure roller provides the compression force for the spring compression, the pressing force of the sub-roller on the copper plate at this time is a flexible pressing force. Although there are thickness and radial errors in the thickness direction of the copper plate, under the flexible pressing force of the pressure roller, the pressure roller can well press the copper plate on the outer circumferential surface of the steel cylinder.

[0098] Ⅳ In the state where the sixth pressure roller is pressed, fix the terminal of the copper plate to the steel cylinder with bolts to prevent the copper plate from loosening, so as to perform copper plate welding. After this step, the copper plate is curled into a copper cylinder.

[0099] When the copper plate is curled, the radial gap between the copper plate and the outer circumference of the steel cylinder ≤ 0.05 mm, that is, the gap between the surface of the copper plate and the outer surface of the steel cylinder ≤ 0.05 mm.

[0100] Step Five: Welding:

[0101] Weld the obtained semi-finished copper cylinder at the butt joint.

[0102] The copper welding wire is dried at 350 °C for 2 hours before welding. Clean the welding groove, remove impurities such as oil stains, rust, and stains on the welding groove and the surfaces on both sides to ensure the cleanliness of the welding surface. Use MIG argon arc welding; the welding current is 650 A, the arc welding voltage is 42 V, the welding speed is 25 cm / min, the welding wire is SCU1898, the welding wire diameter is 3.0 mm, and the power supply polarity is DC reverse connection.

[0103] Insulate the outer circumferential surface of the semi-finished copper cylinder with heat-insulating cotton. Weld the coiled copper plate. After welding, insulate the weld of the copper plate with heat-insulating cotton to allow the weld to cool slowly, with the cooling rate decreasing by ≤8 °C / min and cooling to ≤25 °C to ensure the precision of the coiled and welded copper plate.

[0104] Complete the welding of the semi-finished copper cylinder.

[0105] Remove the screws fixing the copper plate. When removing the screws, remove them at an interval of 1 screw. After performing copper plug welding on the countersunk holes at the removal points, then remove the remaining screws and perform copper plug welding.

[0106] Perform heat treatment to remove stress on the weld at the welded joint of the copper cylinder. Specifically, use the flames of 3 gas torches to heat along the weld of the copper cylinder to 150 °C and keep it warm for 20 minutes to reduce the stress generated during the welding of the copper cylinder. Cover

[0107] The coiling and welding of the copper plate are completed, and the coiling of the copper plate on the outer circle of the steel cylinder is completed, forming the copper-steel cylinder of the copper cathode roller. The arc-shaped frame withdraws from the working position, and the copper-steel cylinder of the cathode roller is lifted off the fixing frame.

[0108] At this point, the copper-steel cylinder of the cathode roller is formed, that is, the copper-steel composite structure of the cathode roller with copper-steel composite is obtained.

[0109] Step Six: Machining of the outer circle of the copper-steel cylinder of the cathode roller:

[0110] Precision turning is performed on the outer circle of the copper-steel cylinder of the cathode roller. During precision turning, the rotational speed of the cathode roller is 12 rpm, the axial movement of the rotating shaft is 2.0 mm / min, and the single-side cutting amount of the outer circle of the copper cylinder is 0.6 mm to ensure the thickness uniformity of the conductive copper layer of the copper-steel composite cathode roller and the geometric tolerance of the copper-steel composite of the copper-steel cylinder of the copper-steel composite cathode roller. After precision turning, the circular runout between the outer circle of the copper-steel cylinder of the cathode roller and the rotating shaft is 0.04 mm, the straightness of the outer circle of the copper-steel composite cylinder is 0.04 mm, and the surface roughness Ra of the precision-turned copper-steel composite cylinder is 3.2, ensuring that the thickness of the copper layer is uniform and consistent, with the copper layer thickness difference ≤0.1 mm, forming a high-precision copper-steel cylinder of the cathode roller.

[0111] Step Seven: Thermal assembly with the titanium cylinder:

[0112] Perform thermal assembly on the obtained high-precision copper-steel cylinder of the cathode roller and the titanium cylinder. The copper-steel cylinder of the cathode roller and the titanium cylinder are assembled with interference fit, with an interference amount of 4 mm; place the titanium cylinder in a pit-type resistance furnace for heating to ≥550 °C and keep it warm for 30 minutes. When the inner hole diameter of the expanded titanium cylinder is larger than the outer circle diameter of the copper-steel cylinder of the cathode roller, sleeve the titanium cylinder and the rotating shaft on the outer circumferential surface of the copper-steel composite copper-steel cylinder of the cathode roller to form a high-precision copper-steel composite cathode roller.

[0113] The tooling used for curling the copper plate in this embodiment includes a rotating shaft 1, multiple pressing rollers, a fixing frame 4, and an arc-shaped frame; the arc-shaped frame includes a first arc-shaped frame 3 and a second arc-shaped frame 15. Each arc-shaped frame is respectively installed on the fixing frame 4, and the concave arc surfaces of the two arc-shaped frames face each other. At the upper ends of the two brackets of the fixing frame, there are steel cylinder bearing seats 2 respectively, forming a rotating shaft support member in the direction of the rotating shaft; both ends of the rotating shaft 1 in the steel cylinder assembly are respectively installed in the steel cylinder bearing seats. In this embodiment, there are six pressing rollers, namely the first pressing roller 5, the second pressing roller 6, the third pressing roller 7, the fourth pressing roller 8, the fifth pressing roller 9, and the sixth pressing roller 10.

[0114] The steel cylinder assembly is the workpiece for curling the copper plate and compounding with it, and is also the carrier during the curling of the copper plate. The steel cylinder assembly includes a steel cylinder 14 and a rotating shaft 1. At the end faces of both ends of the steel cylinder, there are end plates respectively, and both ends of the rotating shaft 1 are fixedly connected to the central holes of the respective end plates. The outer diameter of the steel cylinder is the same as the inner diameter of the copper cylinder 17 formed by curling the copper plate. Both ends of the rotating shaft 1 are respectively installed in the steel cylinder bearing seats through rotating bearings.

[0115] The steel cylinder 17 of the cathode roller serves as the core die blank for curling the copper plate, ensuring the inner hole diameter size of the curled copper plate. The outer circle of the cathode roller steel cylinder has been precision turned with good dimensional and geometric tolerances. The outer diameter of the cathode roller steel cylinder is 2670 mm, the dimensional tolerance of the outer circle of the cathode roller steel cylinder ≤ 0.10 mm, the circular runout of the outer circle of the cathode roller steel cylinder ≤ 0.05 mm, the straightness of the outer circle of the cathode roller steel cylinder ≤ 0.05 mm, and the surface roughness of the outer circle of the cathode roller steel cylinder ≤ Ra3.2 um, providing a good core die blank for curling the copper plate.

[0116] Each of the arc-shaped frames is respectively fixed on the arc-shaped frame mounting plate on the fixing frame 4, symmetrically distributed on both sides of the circumference of the steel cylinder, and a space circle is formed by the inner arc surfaces of the two arc-shaped frames. There are three pressing rollers respectively on the inner arc surfaces of each arc-shaped frame, and both ends of the three pressing rollers are respectively fixed on the inner surfaces of the respective arc-shaped support plates. The circumferential surfaces of each pressing roller are closely attached to the outer surface of the steel cylinder and are pressed by springs; the compression amount of the spring is 19 mm. When the copper plate to be curled enters, the compression amount of the spring is 25 mm.

[0117] The three pressing rollers on the first arc-shaped frame 3 are, clockwise from top to bottom, the first pressing roller 5, the second pressing roller 6, and the third pressing roller 7; the three pressing rollers on the second arc-shaped frame 3 are, counterclockwise from top to bottom, the fourth pressing roller 8, the fifth pressing roller 9, and the sixth pressing roller 10; and the position of the first pressing roller corresponds to that of the fourth pressing roller on the said space circle, the position of the second pressing roller corresponds to that of the fifth pressing roller on the said space circle, and the position of the third pressing roller corresponds to that of the sixth pressing roller on the said space circle. The center lines of each of the pressing rollers are respectively parallel to the center line of the steel cylinder 14.

[0118] As Figure 8As shown in the figure, the circumferential positions of the three pressure rollers located on the second arc-shaped frame 15 are as follows: the included angle β2 between the spatial connection line between the center of the second pressure roller 6 and the center of the cathode roller steel cylinder and the horizontal line is 10 - 15°; the included angle β1 between the spatial connection line between the center of the first pressure roller 5 and the center of the cathode roller steel cylinder and the horizontal line is 40 - 55°; the included angle β3 between the spatial connection line between the center of the third pressure roller 7 and the center of the cathode roller steel cylinder and the horizontal line is -20 - -30°.

[0119] In this embodiment, the circumferential positions of the three pressure rollers located on the first arc-shaped frame 3 are as follows: the included angle β2 between the spatial connection line between the center of the second pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10°; the included angle β1 between the spatial connection line between the center of the first pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40°; the included angle β3 between the spatial connection line between the center of the third pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20°.

[0120] The circumferential positions of the three pressure rollers located on the second arc-shaped frame 15 are as follows: the included angle β5 between the spatial connection line between the center of the fifth pressure roller 9 and the center of the cathode roller steel cylinder and the horizontal line is 10 - 15°; the included angle β4 between the spatial connection line between the center of the fourth pressure roller 8 and the center of the cathode roller steel cylinder and the horizontal line is 40 - 55°; the included angle β6 between the spatial connection line between the center of the sixth pressure roller 10 and the center of the cathode roller steel cylinder and the horizontal line is -20 - -30°.

[0121] In this embodiment, the circumferential positions of the three pressure rollers located on the second arc-shaped frame are as follows: the included angle β5 between the spatial connection line between the center of the fifth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10°; the included angle β4 between the spatial connection line between the center of the fourth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40°; the included angle β6 between the spatial connection line between the center of the sixth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20°.

[0122] The pressing of the copper plate is achieved by multiple pressure rollers; after the copper plate starts to be wound into a circle, the copper plate starts from the second pressure roller and passes through the second to sixth pressure rollers counterclockwise in sequence.

[0123] Each of the pressure rollers is a solid steel rotating shaft. The surface of each pressure roller has knurling to increase the friction between the pressure roller and the copper plate. The two ends of the pressure roller are connection ends, and each connection end is respectively installed in a cylindrical roller bearing and fixed on the pressure roller bearing seat 16. Each pressure roller is parallel to the center line of the outer circle of the steel cylinder, and the parallelism ≤ 0.10 mm.

[0124] The upper surface of the fixing frame 4 is respectively used for installing the steel cylinder bearing seat 2. Arc-shaped frame mounting plates are respectively arranged on the outer surfaces of the two sides of the fixing frame 4; chutes are arranged on the arc-shaped frame mounting plates, and each chute is perpendicular to the center line of the arc-shaped frame where it is located. Each arc-shaped frame slider 19 is respectively installed in each of the chutes, so that each arc-shaped frame can move horizontally along the chute. When the cathode roller steel cylinder is placed into or lifted off the fixing frame 4, each arc-shaped frame moves along the chute and moves away from the working position by a sufficient distance to ensure that the steel cylinder wound with the copper cylinder can be lifted vertically. Each arc-shaped frame moves an appropriate distance of 150 mm and stops, and is locked to the fixing frame. Before the copper plate is ready to be rolled into a circle and enter, each arc-shaped frame moves along the chute to the working position and is locked to the working position by screws. Through the chute structure of each arc-shaped frame, it is ensured that the parallelism between the pressure roller and the cathode roller steel cylinder does not change before and after the movement of each arc-shaped frame, so that when the next steel cylinder is used to roll the copper plate, the parallelism between the pressure roller and the generatrix of the steel cylinder is maintained.

[0125] Both ends of the pressure roller are connecting ends, and each connecting end is respectively installed in a cylindrical roller bearing and fixed on the pressure roller bearing seat 16.

[0126] The pressure roller bearing seat is pressed by a spring 12. The spring is sleeved on a screw rod 11, one end presses on the pressure roller bearing seat 16, and the other end of the screw rod passes through a spring backing plate 13 and is installed on the fixing plate of the first arc-shaped frame or the fixing plate 1 of the second arc-shaped frame.

[0127] When the assembled pressure roller presses the copper plate, the pressure roller rotates in the pressure roller bearing seat 16, so that the copper plate can be evenly pressed on the surface of the steel cylinder 14. Each of the springs 12 respectively exerts pressure on the pressure roller bearing seat 16 through a spring seat. There are multiple spring seats. Each spring seat includes a spring backing plate 13 and two screw rods 11; through holes for installing the screw rods are respectively arranged at both ends of each spring backing plate. The upper ends of the two screw rods 11 respectively pass through the screw holes on the arc-shaped frame fixing plate 15 and the screw holes on the spring backing plate, and the lower ends respectively pass through the screw holes on the pressure roller bearing seat, so as to fixedly connect the pressure roller and the arc-shaped frame. Each of the springs 12 is respectively sleeved on each screw rod 11 and is located between the spring backing plate and the pressure roller bearing seat.

Claims

1. A forming method for a cathode roll cylinder, characterized in that The specific process is as follows: Step 1: Determine the length of the copper plate: Calculate the length L of the copper plate to be coiled. Step 2: Tooling preparation: In the tooling, the arc-shaped frame retracts, the steel cylinder is hoisted onto the bearing seat of the fixed frame, and the coaxiality between the motor and the axis of rotation of the cathode roller steel cylinder is adjusted to ≤0.05 mm; the arc-shaped frame moves forward so that the circumferential surfaces of each pressure roller closely adhere to the outer surface of the steel cylinder, and the parallelism between each pressure roller and the cathode roller steel cylinder is adjusted so that the parallelism is ≤0.05 mm, and each group of pressure rollers is firmly fastened; The cathode roller steel cylinder in the tooling is fixedly connected to the motor through a rotating shaft, so that the cathode roller steel cylinder is driven to rotate by the motor; The driving power of the motor is 4KW, and the rotation speed of the cathode roller steel cylinder is 1 r / min; Step 3: Processing of the copper plate: The processing of the copper plate includes processing welding grooves and a plurality of connecting holes on the two short sides of the copper plate respectively; obtaining the copper plate before coiling; Step 4: Coiling of the copper plate: The coiling of the copper plate includes four working steps: fixing the starting end of the copper plate, adjusting the pressure rollers, coiling the copper plate, and fixing the ending end of the copper plate; specifically: Ⅰ Take one short side of the copper plate as the starting end of coiling; fix this starting end on the outer circumferential surface of the steel cylinder by screws; Ⅱ Adjust the springs on the bearing seats on both sides of the pressure rollers so that the circumferential surfaces of each pressure roller closely adhere to the outer surface of the steel cylinder; the compression amount of the spring is 25 - 50 mm, and the compression force of each spring is 2345.8 N - 4691.6 N; Ⅲ Start the motor, electrically drive the cathode roller steel cylinder to rotate, drive the copper plate into the first pressure roller A. When the copper plate passes through each pressure roller, the real-time compression amount of each pressure roller spring is 30 mm, and a pressing force of 2814.96 N is generated on the copper plate; when the copper plate enters each pressure roller, it enters the pressure roller along the welding groove, and the welding groove plays a guiding role; the copper plate first passes through the first pressure roller and is stably coiled on the outer circle of the cathode roller steel cylinder; the rotation speed of the cathode roller is 1 r / min; under the combined action of the driving force of the rotation of the cathode roller and the frictional force generated by the pressing force of the pressure rollers, the copper plate undergoes elastic-plastic deformation, is tightened and closely coiled on the outer circular surface of the cathode roller steel cylinder; as the cathode roller rotates, the copper plate sequentially enters the second pressure roller, the third pressure roller, the fourth pressure roller, the fifth pressure roller, and the sixth pressure roller. Under the action of each pressure roller, the copper plate is gradually wound around the outer circular surface of the steel cylinder and coiled into a circular cylinder to obtain a copper cylinder; Ⅳ Under the state where the sixth pressure roller is pressed tightly, fix the ending end of the copper plate to the copper cylinder and the steel cylinder by bolts so that the copper plate does not loosen, in order to perform the welding of the copper plate; obtain a semi-finished copper cylinder; Step 5: Welding: Weld the butt joint of the semi-finished copper cylinder; Remove the screws fixing the copper plate in the way of spacing 1 screw; Perform heat stress relief treatment on the weld seam at the welding part of the copper cylinder; the heating temperature is 150 °C, and the heat preservation time is 20 min; after the coiling and welding of the copper plate are completed, the arc-shaped frame withdraws from the working position, and the cathode roller copper steel cylinder is lifted off the fixed frame; obtain the cathode roller copper steel cylinder with copper-steel composite; Step 6: Machining of the outer circle of the cathode roller copper steel cylinder: Precision turning of the outer circle of the cathode roller copper steel cylinder; Step 7: Hot fitting with the titanium cylinder The copper-steel cylinder of the cathode roller after precision turning is hot-fitted with the titanium cylinder; an interference fit is performed between the copper-steel cylinder and the titanium cylinder of the cathode roller, with an interference amount of 4 mm; the titanium cylinder is placed in a pit-type resistance furnace for hot-fitting; a titanium-copper-steel composite cathode roller is obtained; The temperature of the hot-fitting is ≥550 °C, and the heat preservation time is 30 min; Thus, the production of the titanium-copper-steel composite cathode roller is completed.

2. The forming method of the cathode roll cylinder according to claim 1, characterized in that, During the welding, the outer circumferential surface of the copper cylinder semi-finished product is insulated with heat preservation cotton; after welding, the weld is insulated, and the temperature of the weld is cooled at a rate of ≤8 °C / min to ≤25 °C to ensure the accuracy of the copper plate curling and welding; The copper welding wire is dried at 350 °C for 2 hours before welding; the welding current is 650 A, the arc welding voltage is 42 V, the welding speed is 25 cm / min, the welding wire is SCU1898, the wire diameter is 3.0 mm, and the power supply polarity is DC reverse connection.

3. The forming method of the cathode roller cylinder according to claim 1, wherein, When the copper plate is curled, the gap between the lower surface of the copper plate and the outer circumferential surface of the steel cylinder is ≤0.05 mm.

4. The forming method of the cathode roll cylinder according to claim 1, characterized in that, During precision turning, the rotational speed of the cathode roller is 15 rpm, the axial movement is 3.0 mm / min, and the single-sided cutting amount of the outer circle of the copper cylinder is 0.6 mm; after precision turning, the circular runout of the outer circle of the copper-steel cylinder of the cathode roller and the rotating shaft is 0.04 mm, the straightness of the outer circle of the copper-steel composite cylinder is 0.04 mm, the surface roughness Ra of the copper-steel composite cylinder is 3.2, and the copper layer thickness difference is ≤0.1 mm.

5. A tooling for the forming method of the cathode roller cylinder described in claim 1, characterized in that, The tooling used for curling the copper plate includes a rotating shaft, a plurality of pressure rollers, a fixed frame, and an arc-shaped frame; the arc-shaped frame includes a first arc-shaped frame and a second arc-shaped frame; each arc-shaped frame is respectively installed on the fixed frame, and the concave arc surfaces of the two arc-shaped frames face each other; there are steel cylinder bearing seats at the upper ends of the two brackets of the fixed frame, forming a rotating shaft support member in the rotating shaft direction; the two ends of the rotating shaft in the steel cylinder assembly are respectively installed in the steel cylinder bearing seats; the pressure rollers are six, namely the first pressure roller, the second pressure roller, the third pressure roller, the fourth pressure roller, the fifth pressure roller, and the sixth pressure roller; each pressure roller is parallel to the center line of the outer circle of the steel cylinder, and the parallelism is ≤0.10 mm; The steel cylinder assembly is the workpiece for curling the copper plate and compounding with it, and is also the carrier during the curling of the copper plate; the two ends of the rotating shaft in the steel cylinder assembly are installed in the steel cylinder bearing seats through bearings; Each of the arc-shaped frames is respectively fixed on the arc-shaped frame mounting plate on the fixed frame, symmetrically distributed on both sides of the circumference of the steel cylinder, and a space circle is formed by the inner arc surfaces of the two arc-shaped frames; there are three pressure rollers on the inner arc surface of each arc-shaped frame, and the two ends of the three pressure rollers are respectively fixed on the inner surface of each arc-shaped support plate; the circumferential surface of each pressure roller is closely attached to the outer surface of the steel cylinder and is pressed tightly by a spring; The compression spring for pressing is a cylindrical helical compression spring, the material is 65Mn, the wire diameter is 2.5 mm, the spring mean diameter is 18 mm, the number of effective turns is 20, the free height H0 = 100 mm, and the single-turn load is 234.58 N.

6. The tooling for the forming method of the cathode roller cylinder as described in claim 5, characterized in that The three pressure rollers located on the first arc-shaped frame are, from top to bottom in the clockwise direction, the first pressure roller, the second pressure roller, and the third pressure roller respectively; the three pressure rollers located on the second arc-shaped frame are, from top to bottom in the counterclockwise direction, the fourth pressure roller, the fifth pressure roller, and the sixth pressure roller respectively; and the position of the first pressure roller corresponds to that of the fourth pressure roller on the said space circle, the position of the second pressure roller corresponds to that of the fifth pressure roller on the said space circle, and the position of the third pressure roller corresponds to that of the sixth pressure roller on the said space circle; the center lines of each of the said pressure rollers are respectively parallel to the center line of the steel cylinder.

7. The tooling for the forming method of the cathode roll cylinder according to claim 5, characterized in that The positions of the three pressure rollers located on the said first arc-shaped frame along the circumferential direction are respectively: the included angle β2 between the space connection line between the center of the second pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10 to 15°; the included angle β1 between the space connection line between the center of the first pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40 to 55°; the included angle β3 between the space connection line between the center of the third pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20 to -30°; The positions of the three pressure rollers located on the said second arc-shaped frame along the circumferential direction are respectively: the included angle β5 between the space connection line between the center of the fifth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 10 to 15°; the included angle β4 between the space connection line between the center of the fourth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is 40 to 55°; the included angle β6 between the space connection line between the center of the sixth pressure roller and the center of the cathode roller steel cylinder and the horizontal line is -20 to -30°.

8. The tooling for the forming method of the cathode roll cylinder according to claim 5, characterized in that, The upper surface of the said fixed frame is respectively used for installing the steel cylinder bearing seats; there are arc-shaped frame mounting plates on the outer surfaces of both sides of the fixed frame; there are chutes on the arc-shaped frame mounting plates, and each chute is perpendicular to the center line of the arc-shaped frame where it is located; each arc-shaped frame slider is respectively installed in each of the said chutes, so that each arc-shaped frame can move horizontally along the chute.

9. The tooling for the forming method of the cathode roll cylinder according to claim 5, characterized in that, The pressure roller bearing seat is pressed by a spring; the spring is sleeved on the screw rod, one end presses on the pressure roller bearing seat, and the other end of the screw rod passes through the spring backing plate and is installed on the fixed plate of the first arc-shaped frame or the fixed plate of the second arc-shaped frame.

10. The tooling for the forming method of the cathode roll cylinder according to claim 5, characterized in that, There are multiple spring seats; each spring seat includes a spring backing plate and two screw rods; there are through holes for installing the screw rods at both ends of each spring backing plate; the upper ends of the two screw rods respectively pass through the screw holes on the arc-shaped frame fixed plate and the screw holes on the spring backing plate, and the lower ends respectively pass through the screw holes on the pressure roller bearing seat, so as to fixedly connect the pressure roller and the arc-shaped frame; each of the said springs is respectively sleeved on each screw rod and is located between the spring backing plate and the pressure roller bearing seat.

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