Super-large-diameter cathode roller for electrolytic copper foil and manufacturing process of super-large-diameter cathode roller

Abstract

The invention discloses a super-large-diameter cathode roller for electrolytic copper foil and a manufacturing process of the super-large-diameter cathode roller, and belongs to the technical field of cathode rollers, a titanium cylinder is integrally formed by adopting a spinning technology, the oxidation resistance is enhanced, the titanium cylinder is prevented from going bad, being damaged or losing efficacy due to oxidation, a self-aligning roller bearing is adopted, the risk of uneven stress of the bearing is reduced, heat conduction oil is introduced into the cathode roller, and the service life of the cathode roller is prolonged. The roller surface temperature is reduced, the transmission efficiency of electric energy is improved, and the automatic welding equipment can ensure that the quality of each welding seam is stable. The super-large-diameter cathode roller for the electrolytic copper foil comprises a steel core, a steel shaft is embedded in the center of the steel core, the outer side edge of the steel core is sleeved with a titanium cylinder, titanium side plates are attached to the surfaces of the two sides of the steel core, and the inner surface of the titanium cylinder and the side surfaces of the titanium side plates are fixed through welding; a titanium ring is welded and fixed at the joint of the titanium cylinder and the titanium side plate, a plastic ring is mounted on the side surface of the titanium ring, the plastic ring is connected and fixed through a gasket and a screw, and a plastic gasket is arranged at the joint of the titanium ring and the plastic ring.

Description

Technical Field

[0001] The present invention belongs to the technical field of cathode rollers, and specifically relates to a cathode roller for electrolytic copper foil with an ultra-large diameter, and specifically also relates to a manufacturing process for a cathode roller for electrolytic copper foil with an ultra-large diameter. Background Art

[0002] In recent years, lithium battery technology has been committed to improving energy density, and thinner lithium battery copper foil can reduce battery weight and thus increase the energy density of lithium batteries, thus becoming a key development trend of lithium battery copper foil. Leading power battery manufacturers are gradually switching to battery manufacturing processes related to ultra-thin copper foil of 6μm and below. Since 2020, the copper foil market size has reached 74 billion yuan. Driven by huge market demand, the production capacity of lithium battery copper foil continues to expand.

[0003] In this context, reducing costs and increasing efficiency becomes particularly important. Whether the production capacity of a single cathode roller can be increased, thereby increasing production efficiency, has become the focus of major copper foil manufacturers. There are two ways to increase the production capacity of a single cathode roller. One is to increase the diameter of the cathode roller, and the other is to increase the width of the cathode roller.

[0004] At present, the maximum width of the cathode roller used in China is 1820mm. If the width is increased, the consistency of the titanium cylinder will be difficult to ensure. In addition, the cathode roller conducts electricity from the end faces on both sides to the roller surface. If the width is too large, the current in the middle area of ​​the cathode roller will be smaller, and the generated copper foil will be less uniform. At the same time, the roller surface of the wide cathode roller may collapse, affecting product quality and even more seriously endangering personnel safety. Therefore, a cathode roller with an ultra-large diameter for electrolytic copper foil and its manufacturing process are needed to help solve this problem. Summary of the invention

[0005] (1) Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a cathode roller for electrolytic copper foil of extra-large diameter and a manufacturing process thereof. The cathode roller for electrolytic copper foil of extra-large diameter and a manufacturing process thereof adopt a spinning technology to form an integral titanium cylinder. Compared with foreign welded titanium cylinders, the cathode roller is not affected by the welds, and the problem of color difference on the surface of the copper foil caused by the welds is fundamentally solved. The titanium cylinder process is improved, and the antioxidant capacity is enhanced to prevent it from deteriorating, being damaged or failing due to oxidation, thereby significantly extending the service life of the cathode roller.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the present invention provides such a cathode roller for electrolytic copper foil of super large diameter, the cathode roller for electrolytic copper foil of super large diameter comprises a steel core, a steel shaft is embedded and installed at the center of the steel core, a titanium cylinder is sleeved and installed on the outer side of the steel core, titanium side plates are fitted and installed on both side surfaces of the steel core, the inner surface of the titanium cylinder and the side surface of the titanium side plate are fixed by welding, a titanium ring is welded and fixed at the connection between the titanium cylinder and the titanium side plate, a plastic ring is installed on the side surface of the titanium ring, the plastic ring is connected and fixed by a gasket and a screw, and a plastic gasket is provided at the connection between the titanium ring and the plastic ring;

[0009] A copper sleeve is sleeved and installed on the outer surface of the steel shaft, a flange is welded and fixed to the shaft head area of ​​the copper sleeve, key slots are opened on the adjacent sides of the steel shaft and the copper sleeve, a key is inserted and installed in the key slot, two conductive rings, a spherical roller bearing and a titanium sleeve are installed in sequence on the side surface of the copper sleeve, a root titanium ring is welded and fixed between the titanium sleeve and the titanium side plate, and a titanium cover is welded on the side surface of the titanium side plate.

[0010] As a further preferred solution, the titanium cylinder is made of TA1, with an outer diameter of 3000mm-4000mm and a wall thickness of 6-30mm. There is no weld on the surface, and the blank is processed into a titanium cylinder of required specifications through a spinning process. The inner surface of the titanium cylinder is silver-plated, and the steel core and the titanium cylinder are fitted with interference fit, with an interference amount of 1-5mm. The titanium ring is a circular ring with an outer diameter of 3000-4000mm, a thickness of 15-65mm, and a material of TA2. There are two chamfers on the top surface, and M8 or M10 threaded holes on the side surface. The hole position of the titanium ring corresponds to the hole position of the plastic ring.

[0011] Specifically, the center of the steel shaft is provided with a through hole, which can spray heat transfer oil into the cathode roller to reduce the temperature of the cathode roller. The side end surface is provided with 4 threaded holes with a depth of 10-80 mm and made of 45# steel. The shaft heads at both ends are machined with lathe tips with an angle of 30°-90°, and one end of the shaft head is provided with a keyway for use with a flange or a gear.

[0012] Furthermore, the plastic ring has M8 or M10 countersunk holes on the side, with a total of 72, 80 or 96 holes in the whole circle. A notch is opened on the side close to the steel core, and the material is CPVC or PP, which is spliced ​​into a whole ring by a quarter, a fifth or a sixth of the arc. The plastic gasket is a circular ring with an outer diameter of 18-30mm and a thickness of 5-12mm.

[0013] Preferably, the flange has 5-10 through holes and a keyway on the inner surface. The through hole diameter is 30-50 mm, and the surface has a 1-2 mm chamfer. The inner surface of the flange has a 1-8 mm chamfer, and is made of 45 steel with an anti-oxidation treatment.

[0014] Furthermore, the titanium ring is located on the side surface of the titanium side plate and the inner surface of the titanium cylinder, and the axial center line of the titanium ring and the steel core is the same.

[0015] Furthermore, a water groove is formed on the outer surface of the titanium sheath.

[0016] Furthermore, a bearing sleeve and a bearing inner stopper are installed between the spherical roller bearing and the copper sleeve, the outer surface of the bearing inner stopper is fitted with the inner surface of the spherical roller bearing, the inner surface of the bearing inner stopper is fitted with the outer surface of the bearing sleeve, and the bearing inner stopper is fixed between the spherical roller bearing and the titanium sleeve.

[0017] Furthermore, the titanium covers are provided in a plurality, and the plurality of the titanium covers are arranged in a circular array with the axis of the titanium side plate as the center, and the plurality of the titanium covers are provided in three circles with different diameters on the titanium side plate, wherein the outer circle has 12-24 titanium covers, and the angle between two titanium covers is 15°-30°. The other two circles have 6 or 8 titanium covers each, and the angle between two titanium covers is 60° or 45°. The titanium side plate is welded with identification numbers 0, 6, 12...66 or 1, 2, 3...12, the angle between the two numbers is the same, and the index circle of the identification numbers is concentric with the index circle of the outer circle titanium cover.

[0018] Furthermore, the steel core includes a large copper plate, a small copper plate, a large steel plate and a small steel plate arranged from the outside to the inside, the outer surface of the large steel plate is in contact with the inner surface of the steel cylinder, the outer surface of the steel cylinder is in contact with the inner surface of the copper cylinder, and the interior of the steel cylinder is provided with a number of ribs, support rods and reinforcement rings, and the ribs are provided with weight-reducing holes.

[0019] A manufacturing process for a cathode roller for electrolytic copper foil with an ultra-large diameter comprises the following steps:

[0020] S1, processing titanium cylinder;

[0021] S2. Weld the shaft and the steel core, and assemble the copper sleeve and the shaft with interference fit;

[0022] S3. For the first static balance adjustment, weld the counterweight rod in the counterweight hole, rotate the steel core, and if the steel core stops freely and does not rotate or the rotation amount is ≤50mm, it is qualified.

[0023] S4, turning the outer diameter of the steel core and opening a U-shaped groove on the outer surface;

[0024] S5, hot-fit the titanium tube and the steel core, put the titanium tube into a heating furnace, the temperature is 300℃-650℃, the heat preservation time is 0.5-5 hours, then put the steel core into the titanium tube, and naturally cool to room temperature, the interference 2 is 1-5mm;

[0025] S6, titanium side plate welding identification number 0, 6, 12 ... 66 or 1, 2, 3 ... 12, and use automatic welding equipment to weld titanium side plate, titanium sheath, titanium ring and titanium cover;

[0026] S7, heat-fit the bearing bushing, the bearing bushing and the copper bushing are interference-fitted, the interference amount 3 is 0.1-5mm, the heating temperature is 10-300℃, and the time is 5-60 minutes;

[0027] S8. Turn the outer surface of the titanium cylinder to the specified size, use M8 or M10 screws and washers to install the plastic ring, a plastic washer is fixed between the plastic ring and the titanium ring, and install the bearing inner stopper, bearing and adapter sleeve in sequence;

[0028] S9, grinding the outer surface of the titanium cylinder, using 40 mesh, 80 mesh, 120 mesh, 200 mesh, 600 mesh grinding wheels to grind the roller surface, and the outer surface should be free of oil stains, pinholes, indentations, scratches, color differences, spots and other defects;

[0029] S10, dye penetrant method to detect weld quality;

[0030] S11. Adjust the static balance for the second time, weld the counterweight block on the titanium side plate, rotate the cathode roller, and it is qualified if the cathode roller stops freely and does not rotate, or the rotation amount is ≤50mm;

[0031] S12, air tightness test;

[0032] S13. Assemble accessories. Install two conductive rings on the copper sleeves on both sides according to the predetermined positions. Install the flange on the shaft head. Connect the flange to the steel shaft with a key.

[0033] S14. Packaging: Use industrial cling film, bubble pad, pearl cotton board, and iron sheet to wrap the roller surface. After bundling, spray the company logo. Bubble pads are used to wrap the steel shafts and accessories on both sides of the cathode roller.

[0034] Furthermore, the processing of the titanium cylinder in S1 comprises the following steps:

[0035] A1. Prepare a titanium cylinder by spinning method;

[0036] A2. Turn the titanium cylinder, use a micrometer to measure the inner diameter of the titanium cylinder, find the lowest point, and turn the inner diameter of the titanium cylinder until all the inner diameter of the titanium cylinder can be seen;

[0037] A3, heat treatment of titanium cylinder, put into heating furnace, temperature 300℃-650℃, holding time 0.5-5 hours, grain size grade 10-12;

[0038] A4. Align the titanium cylinder, put it into the plate rolling machine, and apply force to the working roll to align the cylinder.

[0039] A5. Silver plating: the inner surface of the titanium cylinder is silver-plated.

[0040] Further, the coloring penetration method in S10 comprises the following steps:

[0041] B1. Spray penetrant on the weld area and let it sit for 10-20 minutes;

[0042] B2. Spray cleaning agent to remove surface penetrant, and the drying time is 5-10 minutes;

[0043] B3. Finally, apply the developer and wait for 3-5 minutes. If there is no residual penetrant seeping out of the weld, it is qualified.

[0044] Furthermore, the airtightness test in S12 includes the following steps:

[0045] C1. Introduce 0.01-0.04MPa argon gas into the cathode roller from the axial through hole;

[0046] C2, seal the vent holes at both ends,

[0047] C3. There is no leakage during the pressure maintenance for 0.5-2.5 hours; the cathode roller is judged to be qualified.

[0048] (3) Beneficial effects

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention adopts the spinning technology to form the titanium cylinder in one piece. Compared with the foreign welded titanium cylinder, the present invention is not affected by the weld, fundamentally solves the problem of color difference on the copper foil surface caused by the weld, improves the titanium cylinder process, enhances the anti-oxidation ability, prevents it from deteriorating, being damaged or failing due to oxidation, thereby significantly extending the service life of the cathode roller;

[0051] Compared with traditional sliding bearings, the present invention adopts a spherical roller bearing, which can automatically adjust the relative deflection between the shaft and the bearing seat, compensate for installation errors and shaft deflection, reduce the risk of uneven bearing force, and increase the service life of the bearing;

[0052] The cathode roller of the present invention can be filled with heat-conducting oil to reduce the roller surface temperature, improve the transmission efficiency of electric energy and reduce energy consumption.

[0053] The present invention adopts automatic welding equipment, which can ensure the stable quality of each weld through precise programming and control, and reduce welding defects caused by human factors, such as pores, slag inclusions, lack of fusion, etc.;

[0054] The present invention can effectively improve production efficiency by increasing the overall diameter of the cathode roller. Under the same conditions, the foil production efficiency of a cathode roller with a diameter of 3.6 meters is increased by about 36% compared with that of a cathode roller with a diameter of 2.7 meters.

[0055] Due to the increase in the output of a single unit, the fixed costs allocated to each unit, such as equipment depreciation, factory rental, etc., will be reduced, thereby reducing production costs. The manufacturing method is simple and easy to operate, and it is easy to promote and replicate between different production sites or enterprises, which is conducive to the dissemination of technology and the development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1 It is a front view of the present invention;

[0058] Figure 2 For the present invention Figure 1 The enlarged view of point I in the middle;

[0059] Figure 3 is a side view of the present invention;

[0060] Figure 4 For the present invention Figure 1 Sectional view at the middle BB;

[0061] Figure 5 It is a cross-sectional view of the steel core in the present invention;

[0062] Figure 6 is a process flow chart of the present invention;

[0063] Figure 7 A flow chart of processing a titanium cylinder according to the present invention;

[0064] Figure 8 It is a flow chart of the color penetration method of the present invention;

[0065] Fig. 9 Flow chart of the airtightness test of the present invention.

[0066] The marks in the attached drawings are: 1. steel core; 1-1. large copper plate; 1-2. small copper plate; 1-3. small steel plate; 1-4. large steel plate; 1-5. steel cylinder; 1-6. copper cylinder; 1-7. rib plate; 1-8. support rod; 1-9. reinforcement ring; 2. titanium cylinder; 3. titanium side plate; 4. titanium ring; 5. plastic washer; 6. gasket; 7. screw; 8. plastic ring; 9. titanium sleeve; 10. steel shaft; 11. copper sleeve; 12. flange; 13. key; 14. conductive ring; 15. spherical roller bearing; 16. tightening sleeve; 17. bearing bushing; 18. bearing inner stop; 19. titanium cover; 20. root titanium ring. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] This specific embodiment is a cathode roller for electrolytic copper foil with an ultra-large diameter, such as Figure 1-5 As shown, the cathode roller for electrolytic copper foil of super large diameter comprises a steel core 1, a steel shaft 10 is embedded and installed at the center of the steel core 1, a titanium cylinder 2 is sleeved and installed on the outer side of the steel core 1, the steel core 1 and the titanium cylinder 2 are fitted with interference, the interference is 1-5mm, the titanium cylinder 2 is made of TA1, the outer diameter is 3000mm-4000mm, the wall thickness is 6-30mm, the two side surfaces of the steel core 1 are fitted with titanium side plates 3, the inner surface of the titanium cylinder 2 and the side surface of the titanium side plate 3 are fixed by welding, and the titanium cylinder 2 and the titanium side plate 3 are welded and fixed with a titanium ring 4, which is located on the side surface of the titanium side plate 3 and the inner surface of the titanium cylinder 2. The titanium ring 4 and the steel core 1 have the same axis. A plastic ring 8 is installed on the side surface of the titanium ring 4, and the plastic ring 8 is connected and fixed by a gasket 6 and a screw 7. A plastic gasket 5 is provided at the connection between the titanium ring 4 and the plastic ring 8; a copper sleeve 11 is sleeved and installed on the outer surface of the steel shaft 10, and a through hole is opened in the center of the steel shaft 10, and the through hole can sputter heat transfer oil into the cathode roller to reduce the temperature of the cathode roller. There are 4 threaded holes on the side end surface, with a depth of 10-80mm, and the material is 45 steel. A flange 12 is welded and fixed to the shaft head area of ​​the copper sleeve 11, and a key slot is opened on the adjacent side of the steel shaft 10 and the copper sleeve 11, and a key 13 is inserted and installed in the key slot. Two conductive rings 14, a self-aligning roller bearing 15 and a titanium sleeve 9 are installed in turn on the side surface of the copper sleeve 11.

[0069] The outer surface of the titanium sheath 9 is provided with a water groove, a root titanium ring 20 is welded and fixed between the titanium sheath 9 and the titanium side plate 3, a titanium cover 19 is welded on the side surface of the titanium side plate 3, and a plurality of titanium covers 19 are provided, and the plurality of titanium covers 19 are arranged in a circular array with the axis of the titanium side plate 3 as the center, and the plurality of titanium covers 19 are arranged on the titanium side plate 3 in three circles with different diameters, wherein the outer circle has 12-24 titanium covers 19, and the angle between the two titanium covers 19 is 15°-30°, and the other two circles have 6 or 8 titanium covers 19, and the angle between the two titanium covers 19 is 60° or 45°, and the titanium The side plate 3 is welded with identification numbers 0, 6, 12...66 or 1, 2, 3...12, the angle between the two numbers is the same, the identification number graduation circle is concentric with the outer ring titanium cover 19 graduation circle, and the production efficiency can be effectively improved by increasing the overall diameter of the cathode roller. Under the same conditions, the foil production efficiency of the 3.6-meter diameter cathode roller is about 36% higher than that of the 2.7-meter diameter cathode roller. The use of automatic welding equipment can ensure the stable quality of each weld through precise programming and control, and reduce welding defects caused by human factors, such as pores, slag inclusions, and unfusion.

[0070] A bearing bushing 17 and a bearing inner stopper 18 are installed between the above-mentioned spherical roller bearing 15 and the copper sleeve 11. The outer surface of the bearing inner stopper 18 fits with the inner surface of the spherical roller bearing 15, and the inner surface of the bearing inner stopper 18 fits with the outer surface of the bearing bushing 17. The bearing inner stopper 18 is fixed between the spherical roller bearing 15 and the titanium sleeve 9. The bearing inner stopper 18 is used to fix the position of the spherical roller bearing 15 to prevent the spherical roller bearing 15 from moving. Compared with traditional sliding bearings, the spherical roller bearing can automatically adjust the relative deflection between the shaft and the bearing seat, compensate for installation errors and flexural deformation of the shaft, reduce the risk of uneven force on the bearing, and increase the service life of the bearing.

[0071] The steel core 1 includes a large copper plate 1-1, a small copper plate 1-2, a large steel plate 1-4 and a small steel plate 1-3 arranged from the outside to the inside. The outer surface of the large steel plate 1-4 fits with the inner surface of the steel cylinder 1-5, and the outer surface of the steel cylinder 1-5 fits with the inner surface of the copper cylinder 1-6. The interior of the steel cylinder 1-5 is provided with a plurality of rib plates 1-7, support rods 1-8 and reinforcement rings 1-9. The rib plate 1-7 is provided with weight reduction holes. By setting the counterweight holes, the overall mass of the rib plate 1-7 can be reduced while ensuring the strength.

[0072] This specific embodiment is a process for manufacturing a cathode roller for electrolytic copper foil with an ultra-large diameter. Figure 6-9 As shown, the following embodiments are included:

[0073] Example 1: The manufacturing process steps of the cathode roller for electrolytic copper foil with a diameter of 3.6 m are as follows:

[0074] Step 1: Prepare the titanium cylinder by spinning method, with the radius of the spinning wheel being 30 mm, the spinning wheel forming angle being 35°, the rotation speed being 40 mm / r, the feed ratio being 4, the pressing amount being 22 mm, and the offset being 40 mm.

[0075] Step 2: Turn the titanium tube, use a micrometer to measure the inner diameter of the titanium tube, find the lowest point, and turn the inner diameter of the titanium tube until all the inner diameter can be seen. It is 3550mm.

[0076] Step 3: Heat treatment of the titanium tube, put it into the heating furnace, the temperature is 420℃, the insulation time is 2 hours, and the grain size grade is 10.5.

[0077] Step 4: Shape the titanium cylinder, put it into the plate rolling machine, and apply force to the working roller to achieve the purpose of roundness. Straightness ≤5mm, ovality ≤8mm.

[0078] Step 5: Silver plating: the inner surface of the titanium tube is silver-plated, and the thickness of the silver layer is 7um.

[0079] Step 6: Weld the shaft and steel core, concentricity ≤ 0.1mm.

[0080] Step 7: Interference fit the copper sleeve and the shaft, the interference amount 1 is 3mm.

[0081] Step 8: Adjust the static balance for the first time, weld the counterweight rod in the counterweight hole, rotate the steel core, and after the steel core stops freely, the rotation amount is 30mm. It is qualified if the rotation amount is ≤50mm.

[0082] Step 9: Turn the outer diameter of the steel core and open a U-shaped groove on the outer surface.

[0083]

[0084] Step 10: Hot-fit the titanium tube and the steel core. Put the titanium tube into the heating furnace at 400℃ for 3 hours, then put the steel core into the titanium tube, the parallelism between the two should be ≤1mm, and cool naturally to room temperature, the interference 2 should be 4mm.

[0085] Step 11: The titanium side plate welding identification numbers are 0, 6, 12...66, and the interval between two numbers is 30°.

[0086] Step 12: Use automatic welding equipment to weld the titanium side plate, titanium sheath, titanium ring and titanium cover. Process parameter range: welding current 500A, welding voltage 36V, welding speed 200mm / min, wire feeding speed 300mm / min. The coaxiality of the pitch circle of the titanium side plate, titanium sheath, titanium ring and titanium cover with the steel core is ≤0.05mm.

[0087] Step 13: Heat-fit the bearing sleeve, and the bearing sleeve and the copper sleeve are interference-fitted, and the interference amount 3 is 1mm. The heating temperature is 100℃ for 30 minutes.

[0088] Step 14: Turn the outer surface of the titanium cylinder to the specified size of 3600mm, the outer surface roughness Ra ≤ 3.2μm, straightness and ovality ≤ 0.08mm.

[0089] Step 15: Use M10 screws and washers to install the plastic ring. A plastic washer is fixed between the plastic ring and the titanium ring.

[0090] Step 16: Install the bearing inner stopper, bearing and adapter sleeve in sequence. The bearing inner stopper is used to fix the bearing position and prevent the bearing from moving. The adapter sleeve is used in conjunction with the bearing.

[0091] Step 17: Grind the outer surface of the titanium cylinder, use 40 mesh, 80 mesh, 120 mesh, 200 mesh, 600 mesh grinding wheels to grind the roller surface, so that the outer surface roughness Ra ≤ 0.3μm, straightness and ovality ≤ 0.08mm. There are no defects such as oil stains, pinholes, indentations, scratches, color differences, spots, etc. on the outer surface.

[0092] Step 18: Use the color penetrant method to test the weld quality. Spray the penetrant on the weld area and let it sit for 15 minutes. Spray the cleaning agent to remove the surface penetrant and dry it for 5 minutes. Finally, apply the developer and wait for 3 minutes. If there is no residual penetrant seeping out of the weld, it is qualified.

[0093] Step 19: Adjust the static balance for the second time, weld the counterweight block on the titanium side plate, rotate the cathode roller, and after the cathode roller stops freely, the rotation amount is 20mm. The rotation amount ≤50mm is qualified.

[0094] Step 20: Air tightness test: Introduce 0.015MPa argon gas into the cathode roller from the axial through hole, seal the air holes at both ends, and maintain the pressure for 1 hour without leakage. The cathode roller is considered qualified.

[0095] Step 21: Assemble accessories. Install two conductive rings on the copper sleeves on both sides according to the predetermined positions, install the flange at the shaft head position, and connect the flange to the steel shaft with a key.

[0096] Step 22: Packaging: Use industrial cling film, bubble pad, pearl cotton board, and iron sheet to wrap the roller surface. After bundling, spray the company logo. Wrap the steel shaft and accessories on both sides of the cathode roller with bubble pad.

[0097] Example 2: The manufacturing process steps of the cathode roller for electrolytic copper foil with a diameter of 3.0 m are as follows:

[0098] Step 1: Prepare the titanium cylinder by spinning method, with the radius of the spinning wheel being 12 mm, the spinning wheel forming angle being 15°, the rotation speed being 23 mm / r, the feed ratio being 3, the pressing amount being 15 mm, and the offset being 20 mm.

[0099] Step 2: Turn the titanium tube, use a micrometer to measure the inner diameter of the titanium tube, find the lowest point, and turn the inner diameter of the titanium tube until all the inner diameter can be seen. It is 2960mm.

[0100] Step 3: Heat treatment of the titanium tube, put it into the heating furnace, the temperature is 420℃, the insulation time is 2 hours, and the grain size grade is 11.

[0101] Step 4: Shape the titanium cylinder, put it into the plate rolling machine, and apply force to the working roller to achieve the purpose of roundness. Straightness ≤5mm, ovality ≤10mm

[0102] Step 5: Silver plating: the inner surface of the titanium tube is silver-plated, and the thickness of the silver layer is 5um.

[0103] Step 6: Weld the shaft and steel core, concentricity ≤ 0.1mm.

[0104] Step 7: Interference fit the copper sleeve and the shaft, the interference amount 1 is 3mm.

[0105] Step 8: Adjust the static balance for the first time, weld the counterweight rod in the counterweight hole, rotate the steel core, and after the steel core stops freely, the rotation amount is 15mm. It is qualified if the rotation amount is ≤50mm.

[0106] Step 9: Turn the outer diameter of the steel core and open a U-shaped groove on the outer surface.

[0107]

[0108] Step 10: Hot-fit the titanium tube and the steel core. Put the titanium tube into the heating furnace at 400℃ for 3 hours, then put the steel core into the titanium tube, the parallelism between the two should be ≤1mm, and cool naturally to room temperature, the interference 2 should be 4mm.

[0109] Step 11: The titanium side plate welding identification numbers are 1, 2, 3...12, and the interval between two numbers is 30°.

[0110] Step 12: Use automatic welding equipment to weld the titanium side plate, titanium sheath, titanium ring and titanium cover. Process parameter range: welding current 400A, welding voltage 31V, welding speed 300mm / min, wire feeding speed 350mm / min. The coaxiality of the pitch circle of the titanium side plate, titanium sheath, titanium ring and titanium cover with the steel core is ≤0.05mm.

[0111] Step 13: Heat-fit the bearing sleeve, and the bearing sleeve and the copper sleeve are interference-fitted, and the interference amount 3 is 1mm. The heating temperature is 100℃ for 30 minutes.

[0112] Step 14: Turn the outer surface of the titanium cylinder to the specified size of 3000mm, the outer surface roughness Ra ≤ 3.2μm, straightness and ovality ≤ 0.08mm.

[0113] Step 15: Use M8 screws and washers to install the plastic ring. A plastic washer is fixed between the plastic ring and the titanium ring.

[0114] Step 16: Install the bearing inner stopper, bearing and adapter sleeve in sequence. The bearing inner stopper is used to fix the bearing position and prevent the bearing from moving. The adapter sleeve is used in conjunction with the bearing.

[0115] Step 17: Grind the outer surface of the titanium cylinder, use 40 mesh, 80 mesh, 120 mesh, 200 mesh, 600 mesh grinding wheels to grind the roller surface, so that the outer surface roughness Ra ≤ 0.3μm, straightness and ovality ≤ 0.08mm. There are no defects such as oil stains, pinholes, indentations, scratches, color differences, spots, etc. on the outer surface.

[0116] Step 18: Use the color penetrant method to test the weld quality. Spray the penetrant on the weld area and let it sit for 20 minutes. Spray the cleaning agent to remove the surface penetrant and dry it for 10 minutes. Finally, apply the developer and wait for 5 minutes. If there is no residual penetrant seeping out of the weld, it is qualified.

[0117] Step 19: Adjust the static balance for the second time, weld the counterweight block on the titanium side plate, rotate the cathode roller, and after the cathode roller stops freely, the rotation amount is 8mm. The rotation amount ≤50mm is qualified.

[0118] Step 20: Air tightness test: Introduce 0.04MPa argon gas into the cathode roller from the axial through hole, seal the air holes at both ends, and maintain the pressure for 2.5 hours without leakage. The cathode roller is considered qualified.

[0119] Step 21: Assemble accessories. Install two conductive rings on the copper sleeves on both sides according to the predetermined positions, install the flange at the shaft head position, and connect the flange to the steel shaft with a key.

[0120] Step 22: Packaging: Use industrial cling film, bubble pad, pearl cotton board, and iron sheet to wrap the roller surface. After bundling, spray the company logo. Wrap the steel shaft and accessories on both sides of the cathode roller with bubble pad.

[0121] All technical features in this embodiment can be freely combined according to actual needs.

[0122] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cathode roller for electrolytic copper foil of super large diameter, the cathode roller for electrolytic copper foil of super large diameter comprising a steel core (1), characterized in that: A steel shaft (10) is embedded and installed at the center of the steel core (1), a titanium cylinder (2) is sleeved and installed on the outer side of the steel core (1), and titanium side plates (3) are fitted on both side surfaces of the steel core (1). The inner surface of the titanium cylinder (2) and the side surface of the titanium side plate (3) are fixed by welding. A titanium ring (4) is welded and fixed at the connection between the titanium cylinder (2) and the titanium side plate (3), and a plastic ring (8) is installed on the side surface of the titanium ring (4). The plastic ring (8) is connected and fixed by a gasket (6) and a screw (7), and a plastic gasket (5) is provided at the connection between the titanium ring (4) and the plastic ring (8); A copper sleeve (11) is sleeved and installed on the outer surface of the steel shaft (10), and a flange (12) is welded and fixed in the shaft head area of ​​the copper sleeve (11). A key slot is provided on the adjacent side of the steel shaft (10) and the copper sleeve (11), and a key (13) is inserted and installed in the key slot. Two conductive rings (14) and a spherical roller bearing (15) and a titanium sleeve (9) are sequentially installed inwardly on the side surface of the copper sleeve (11), and a root titanium ring (20) is welded and fixed between the titanium sleeve (9) and the titanium side plate (3), and a titanium cover (19) is welded on the side surface of the titanium side plate (3).

2. The cathode roller for electrolytic copper foil with an ultra-large diameter according to claim 1, characterized in that: The titanium cylinder (2) is made of TA1, has an outer diameter of 3000mm-4000mm, and a wall thickness of 6-30mm.

3. The cathode roller for electrolytic copper foil with an ultra-large diameter according to claim 1, characterized in that: A through hole is opened at the center of the steel shaft (10), and the through hole can sputter heat-conducting oil into the interior of the cathode roller.

4. The cathode roller for electrolytic copper foil with an ultra-large diameter according to claim 1, characterized in that: A bearing bushing (17) and an adapter sleeve (16) are installed between the spherical roller bearing (15) and the copper sleeve (11); the outer surface of the adapter sleeve (16) is in contact with the inner surface of the spherical roller bearing (15); the inner surface of the adapter sleeve (16) is in contact with the outer surface of the bearing bushing (17); and a bearing inner stopper (18) is fixed between the spherical roller bearing (15) and the titanium sleeve (9).

5. The cathode roller for electrolytic copper foil with an ultra-large diameter according to claim 1, characterized in that: A plurality of the titanium covers (19) are provided, and the plurality of the titanium covers (19) are arranged in a circular array with the axis of the titanium side plate (3) as the center, and the plurality of the titanium covers (19) are provided in three circles with different diameters on the titanium side plate (3).

6. The cathode roller for electrolytic copper foil with an ultra-large diameter according to claim 1, characterized in that: The steel core (1) comprises a large copper plate (1-1), a small copper plate (1-2), a large steel plate (1-4) and a small steel plate (1-3) arranged from outside to inside, the outer surface of the large steel plate (1-4) is in contact with the inner surface of the steel cylinder (1-5), the outer surface of the steel cylinder (1-5) is in contact with the inner surface of the copper cylinder (1-6), and a plurality of ribs (1-7), support rods (1-8) and reinforcement rings (1-9) are arranged inside the steel cylinder (1-5), and the ribs (1-7) are provided with weight-reducing holes.

7. A manufacturing process for a cathode roller for electrolytic copper foil of super large diameter, which is used for a cathode roller for electrolytic copper foil of super large diameter as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1, processing titanium cylinder; S2. Weld the shaft and the steel core, and assemble the copper sleeve and the shaft with interference fit; S3. For the first static balance adjustment, weld the counterweight rod in the counterweight hole, rotate the steel core, and if the steel core stops freely and does not rotate or the rotation amount is ≤50mm, it is qualified. S4, turning the outer diameter of the steel core and opening a U-shaped groove on the outer surface; S5, hot-fit the titanium tube and the steel core, put the titanium tube into a heating furnace, the temperature is 300℃-650℃, the heat preservation time is 0.5-5 hours, then put the steel core into the titanium tube, and naturally cool to room temperature, the interference 2 is 1-5mm; S6, titanium side plate welding identification number 0, 6, 12 ... 66 or 1, 2, 3 ... 12, and use automatic welding equipment to weld titanium side plate, titanium sheath, titanium ring and titanium cover; S7, heat-fit the bearing bushing, the bearing bushing and the copper bushing are interference-fitted, the interference amount 3 is 0.1-5mm, the heating temperature is 10-300℃, and the time is 5-60 minutes; S8. Turn the outer surface of the titanium cylinder to the specified size, use M8 or M10 screws and washers to install the plastic ring, a plastic washer is fixed between the plastic ring and the titanium ring, and install the bearing inner stopper, bearing and adapter sleeve in sequence; S9, grinding the outer surface of the titanium cylinder, using 40 mesh, 80 mesh, 120 mesh, 200 mesh, 600 mesh grinding wheels to grind the roller surface, and the outer surface should be free of oil stains, pinholes, indentations, scratches, color differences, spots and other defects; S10, dye penetrant method to detect weld quality; S11. Adjust the static balance for the second time, weld the counterweight block on the titanium side plate, rotate the cathode roller, and it is qualified if the cathode roller stops freely and does not rotate, or the rotation amount is ≤50mm; S12, air tightness test; S13. Assemble accessories. Install two conductive rings on the copper sleeves on both sides according to the predetermined positions. Install the flange on the shaft head. Connect the flange to the steel shaft with a key. S14. Packaging: Use industrial cling film, bubble pad, pearl cotton board, and iron sheet to wrap the roller surface. After bundling, spray the company logo. Bubble pads are used to wrap the steel shafts and accessories on both sides of the cathode roller.

8. The manufacturing process of a cathode roller for an electrolytic copper foil with an ultra-large diameter according to claim 7, characterized in that: The processing of the titanium cylinder in S1 comprises the following steps: A1. Prepare a titanium cylinder by spinning method; A2. Turn the titanium cylinder, use a micrometer to measure the inner diameter of the titanium cylinder, find the lowest point, and turn the inner diameter of the titanium cylinder until all the inner diameter of the titanium cylinder can be seen; A3, heat treatment of titanium cylinder, put into heating furnace, temperature 300℃-650℃, holding time 0.5-5 hours, grain size grade 10-12; A4. Align the titanium cylinder, put it into the plate rolling machine, and apply force to the working roll to align the cylinder. A5. Silver plating: the inner surface of the titanium cylinder is silver-plated.

9. The manufacturing process of a cathode roller for an electrolytic copper foil with an ultra-large diameter according to claim 7, characterized in that: The coloring penetration method in S10 comprises the following steps: B1. Spray penetrant on the weld area and let it sit for 10-20 minutes; B2. Spray cleaning agent to remove surface penetrant, and the drying time is 5-10 minutes; B3. Finally, apply the developer and wait for 3-5 minutes. If there is no residual penetrant seeping out of the weld, it is qualified.

10. The manufacturing process of a cathode roller for an electrolytic copper foil with an ultra-large diameter according to claim 7, characterized in that: The airtightness test in S12 comprises the following steps: C1. Introduce 0.01-0.04MPa argon gas into the cathode roller from the axial through hole; C2, seal the vent holes at both ends, C3. There is no leakage during the pressure maintenance for 0.5-2.5 hours; the cathode roller is judged to be qualified.

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