Non-destructive longitudinal shearing production process for surfaces of copper and copper alloy strips

Abstract

The invention relates to a surface lossless longitudinal shearing production process for copper and copper alloy strips, which comprises the following steps of: in the shearing process, establishing uncoiling tension and coiling tension required for shearing the strips through rotating speed matching of an uncoiling machine and a coiling machine, and enabling the strips not to be in contact with a pressing plate when the strips pass through the pressing plate; the uncoiling tension is 0.8-3.5 N / mm < 2 >, and the coiling tension is 1.0-4.0 N / mm < 2 >. A straight-pull production mode is adopted, a pressing plate is not adopted to establish tension, and contact between the surface of the strip and equipment is greatly reduced, so that surface dirt accumulation is reduced, the defect that bright marks and scratches are generated on the surface of a finished strip product is overcome, the shearing yield is increased, the shearing cost is reduced, and the use requirement on a new energy automobile is met.

Description

Technical Field

[0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to a surface non-destructive longitudinal shearing production process for copper and copper alloy strips. Background Art

[0002] In recent years, with the rapid development of the new energy vehicle industry, some new demand points have emerged for copper alloy materials for automobiles. Among them, in key components of new energy vehicles such as power batteries, automotive connectors, and IGBT modules, since product performance has become mature, improving surface finish is an important demand point. Since copper and copper alloy materials are often used in these key equipment as soft products, their surface hardness is relatively low, so various surface defects are prone to occur during the production process.

[0003] The longitudinal shearing process is a process in which the copper and copper alloy strips are sheared in a continuous circular motion with the disc shear blade and the copper strip to form a shear without breakpoints, and the material is divided into narrow strips along the longitudinal direction. It is the last process before the copper and copper alloy products are packaged as finished products. Although the surface of the product has been ground, cleaned, passivated and other processes before shearing, due to the influence of factors such as the production environment and the medium state, the product surface cannot be absolutely clean and free of dirt. Therefore, during the longitudinal shearing process, these surface dirt will accumulate on the shearing equipment, and after friction with the strip surface, obvious bright prints and scratches will be caused. Even if the surface finish of the product is high, dust and dirt in the air may fall on the surface of the strip and accumulate on the equipment. The cost of closed dust-free management of the entire production workshop is high. At the same time, since the processing of copper and copper alloy strips often involves heating processes such as annealing, the oxide scale produced is an important source of dirt in the workshop, so dust-free management is difficult to achieve, resulting in long-term unresolved damage to the shearing surface. Summary of the invention

[0004] The purpose of the present invention is to provide a surface non-destructive longitudinal shearing production process for copper and copper alloy strips, to optimize the shearing process for copper and copper alloy strips, especially soft products, to adopt a straight-pull production method while ensuring the shearing size of the product, to greatly reduce the contact position between the strip surface and the equipment, thereby reducing the accumulation of dirt on the surface, thereby avoiding the defects of bright marks and scratches on the surface of the finished strip, improving the shearing yield, reducing the shearing cost, and meeting the use requirements in new energy vehicles.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a production process for non-destructive longitudinal shearing of copper and copper alloy strips. During the shearing process, the uncoiling tension and coiling tension required for strip shearing are established by coordinating the speeds of the uncoiling machine and the coiling machine, and the strip does not contact the pressing plate when passing through the pressing plate; the uncoiling tension is 0.8-3.5N / mm 2 , winding tension is 1.0-4.0N / mm2 .

[0006] During the shearing process, the loop position of the loop pit is adjusted to 0.

[0007] When shearing, start with low speed shearing, observe the equipment parameters and operating status, then increase the shearing speed, and according to the shearing speed, appropriately adjust the rotation speed of the uncoiler and coiler according to the raw material coil diameter and the inner diameter of the coiling sleeve to achieve appropriate uncoiling tension and coiling tension.

[0008] It includes loading operations, tool alignment operations, isolator alignment operations, material threading operations, shearing operations, weight checking operations, blanking operations and packaging and warehousing.

[0009] During the feeding operation, use alcohol to wet the gauze, wipe all the rollers and rubber ring surfaces that come into contact with the material, remove foreign matter on the surface, and check whether the stick can rotate flexibly.

[0010] During the tool setting operation, use cleaning agent to spray or soak the tool holder, shear shaft and required tool matching tools, and use cotton-free white gauze to wipe the tool holder, shear shaft and tool matching tools. It is qualified if they are still white after wiping.

[0011] Furthermore, the cleaning agent described in the tool setting operation is replaced by acetone.

[0012] The beneficial effects of the present invention are: 1. Improved product quality. This non-destructive longitudinal shearing process will not cause cracks, scratches, cracks or other forms of damage to the surface of copper and copper alloys during the shearing process, thereby ensuring the appearance quality and integrity of the product. The reduction of these surface defects not only improves the aesthetics of the product and fully meets the requirements for use in new energy vehicles, but also has a good improvement effect in other electronic and electrical fields. In addition, in the production process of the ordinary shearing method, the unwinding tension is set to 1.8-4.5N / mm according to different thicknesses. 2 , the winding tension is set to 1.3-5.5N / mm 2 The present invention eliminates the production method of press plate tension, and the unwinding tension can be reduced to 0.8-3.5N / mm 2 , the winding tension is reduced to 1.0-4.0N / mm 2 Because the tension used is smaller, the appearance of the material can be better maintained during the shearing process of the soft product, and it is not easy to be deformed due to excessive tension.

[0013] At the same time, this non-destructive longitudinal shearing process can also achieve high-precision shearing, ensuring that the size and shape of the product meet the design requirements, reducing the product rejection rate due to processing errors, and reducing the waste of raw materials and production costs.

[0014] 2. Improved production efficiency. Since the process of building tension of the pressing plate is reduced and the production is highly automated, the shearing operation can be carried out continuously and stably, which reduces the time of manual intervention and downtime, thereby significantly improving production efficiency.

[0015] 3. Wide application scope. The non-destructive longitudinal shearing process of the present invention is applicable to various types of copper and copper alloy materials, including brass, bronze, nickel silver, etc., to meet the needs of different application occasions. At the same time, the non-destructive longitudinal shearing process does not require equipment modification, and only needs to adjust the looper of the looper pit to 0 position for use, without the need to increase the cost of equipment modification.

[0016] 4. Energy saving and environmental protection. The non-destructive longitudinal shearing process of the present invention reduces the material waste caused by surface defects and improves the utilization rate of raw materials. Since only the defects at the head and tail of the raw materials and the width of the edge need to be removed, the process yield can stably reach more than 80%. This helps to reduce production costs, reduce energy consumption, and reduce the consumption of natural resources, which meets the requirements of green development of modern industry.

[0017] 5. High space utilization. Compared with the common shearing process, the present invention does not need to keep the length in the looper pit in this step. Therefore, in the process of equipment design, the equipment floor space can be reduced, the space utilization of the factory can be improved, and the production layout can be further optimized in the factory design.

[0018] In summary, a surface non-destructive longitudinal shearing production process for copper and copper alloy strips has significant beneficial effects in improving product quality, increasing production efficiency, extending product service life, environmental protection and energy saving, wide application range and high space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a process flow chart of the present invention; Figure 2 It is a schematic diagram of the production equipment of the present invention; Markings in the figure: 1. Uncoiler, 2. Uncoil pinch roller, 3. Shearing tool, 4. Copper strip, 5. Isolation ring, 6. Pressure plate, 7. Coil pinch roller, 8. Tension measuring roller, 9. Coiler. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0022] Embodiment 1: A process for producing copper and copper alloy strips without damaging the surface of the strips longitudinally, comprising: Figure 1 The process flow is as follows: loading operation → knife alignment operation → isolator alignment operation → material threading operation → shearing operation → weight checking operation → blanking operation → packaging and warehousing.

[0023] The present invention mainly focuses on adjusting the speed coordination of unwinding and winding during the strip shearing process, so that the tension is no longer created by the pressing plate 5 before shearing, and the strip can be wound tightly at a suitable position and without staggered layers during the shearing process. Since the tension is low, the pressing plate 5 only plays a role in controlling the position of the strip, and no longer plays a role in pressing the strip to control the tension, so the use of the pressing plate 5 can be reduced.

[0024] When the pressing plate 5 is used less, after the strip passes through the felt cloth of the pressing plate 5, foreign matter such as dirt on its surface and dust in the air will not accumulate on the equipment, thereby avoiding bright marks caused by friction on the strip surface and better maintaining the surface state of the product after cleaning.

[0025] The specific steps are as follows: The first step is loading operation Use alcohol to wet the gauze, wipe all the rollers and rubber ring surfaces that come into contact with the material, remove foreign matter on the surface, and check whether the stick can rotate flexibly.

[0026] After confirming the material information, use the loading trolley to transport the material to the uncoiler 1. After the uncoiler 1 is used to tighten the material, the clamping roller is used to press the material coil.

[0027] The second step is tool setting. Check the surface of the tool changer shaft and shear shaft to confirm that there are no copper chips, floating dust and other foreign matter, no scratches on the shaft surface, and no burrs on the locating keys on the shaft.

[0028] Use cleaning agent or acetone to spray or soak the tool holder, shear shaft and required tooling tools (including shear blades, compound rings, and distance rings). Use cotton-free white gauze to wipe the tool holder, shear shaft and tooling tools. If they are still white after wiping, they are qualified.

[0029] According to the required cutting width, install the cutter onto the cutter shaft, install the back cap and tighten it onto the shear shaft.

[0030] The third step is to operate the isolator According to the required size, install the isolation ring 5 and the isolation plate onto the isolator in sequence.

[0031] Step 4: Threading Open the splicing plate, rotate the button of the pressure arm to make the strip pass through the unwinding pinch roller 2, the flattening roller, and the shearing tool 3 in sequence, and then retract the splicing plate.

[0032] Thread the scrap edge into the scrap edge guide.

[0033] The sheared material passes through the separator, vacuum roller, winding pinch roller 7, tail cutting shear and tension measuring roller 8 in sequence to the winding machine.

[0034] Step 5: Cutting After removing the unqualified strip, measure the strip width to see if it meets the requirements, then expand the coiler drum, stick the strip to the sleeve, and start shearing production.

[0035] During the shearing process, adjust the loop height of the loop pit to 0. When shearing, shear at a low speed first, observe the equipment parameters and operating status, and then increase the shearing speed. According to the shearing speed, the rotation speed of the uncoiler and the coiler is appropriately adjusted by the raw material coil diameter and the inner diameter of the coiling sleeve to achieve the appropriate uncoiling tension and coiling tension to maintain normal shearing of the strip.

[0036] Step 6: Checking the weight The finished material roll is rotated to the direction of the tipping bucket, the turntable automatically flips over, the picking arm is extended, the material is picked up, the strip is flipped in the opposite direction, the picking arm is retracted and other continuous actions are performed, and the strip after flipping is moved to the center of the weighing platform, and the weighing platform is used to weigh and wrap the material roll.

[0037] Step 7: Blanking The stacker crane is used to transport the coils to the stacking table pallet.

[0038] Step 8: Packing and storage According to the packaging requirements, the products on the stacking table pallets are packaged and put into storage.

[0039] The shearing equipment used in the present invention is still a conventional shearing equipment, and its main structure can be referred to Figure 2 As shown, since the present invention does not involve the modification of the shearing equipment, Figure 2 The structure shown in the figure is not the entire structure of the shearing device.

[0040] Before shearing, the present invention does not use the conventional shearing process to establish tension through the pressing plate, but forms a product tension that can complete shearing by coordinating the rotation speeds of the uncoiler and the reel. Compared with the tension established by the pressing plate in the conventional shearing process, this tension is smaller, which can not only meet the shearing needs, but also better maintain the appearance of the material during the shearing process of soft products, and is not easily deformed due to excessive tension.

[0041] For example, in conventional shearing processes, the tension settings for different strip thicknesses are shown in Table 1. In the present invention, the tension settings for the same strip thickness are shown in Table 2.

[0042] Table 1 Tension of conventional shearing process Table 2 Tension of the shearing process of the present invention Compared with the common shearing process, the present invention uses less tension in the fifth step of shearing, and can better maintain the appearance of the material during the shearing of soft products, and is not easily deformed due to excessive tension. After running to the set length or outer diameter, the machine automatically stops, and the tail shear is used to cut the strip to complete the shearing production.

[0043] The following Examples 2-5 adopt the method of Example 1 to longitudinally shear copper and copper alloy strips with specific parameters.

[0044] Embodiment 2: In this embodiment, a blank with a brand of C10200, an original specification of 1.5×630mm, and an M state is cut into products with a specification of 1.5×600mm.

[0045] In the first step, the inner diameter of the coil is 600mm and the weight is 8058kg; in the second step, the shearing tool is installed according to the shearing width of 600mm and the tolerance is ±1mm. According to the operations of the above steps 3 and 4, in the fifth step, the strip is glued to the sleeve with an inner diameter of 400mm and sheared. When shearing, the loop is adjusted to 0 position, the shearing speed is set to 100m / min, and the speed of the uncoiler and coiler is controlled so that the tension of the uncoiler is set to 3.2N / mm 2 , the coiler tension is set to 3.8N / mm 2 , keep the strip shearing normally. In the sixth step, use a strong light flashlight to inspect the surface of the sheared strip, and there are no bright marks, scratches, cracks and other defects. Then check the weight and weigh the final finished product to get 6573kg, and the process yield is 81.57%. Finally, the strip is blanked and packaged for storage.

[0046] Embodiment 3: In this embodiment, a blank with a brand of C10200, an original specification of 0.8×640 mm, and an M state is cut into products with a specification of 0.8×600 mm.

[0047] In the first step, the coil has an inner diameter of 600mm and weighs 8350kg; in the second step, the shearing tool is installed according to the shearing width of 600mm and the tolerance of ±1mm. According to the operations of the above steps 3 and 4, in the fifth step, the strip is glued to the sleeve with an inner diameter of 400mm and sheared. When shearing, the loop is adjusted to 0 position, the shearing speed is set to 120m / min, and the speed of the uncoiler and coiler is controlled so that the tension of the uncoiler is set to 1.5N / mm 2 , the coiler tension is set to 1.8N / mm 2 , keep the strip shearing normally. In the sixth step, use a strong light flashlight to inspect the surface of the sheared strip, and there are no bright marks, scratches, cracks and other defects. Then check the weight and weigh the final finished product to get 6885kg, and the process yield is 82.46%. Finally, the strip is blanked and packaged for storage.

[0048] Embodiment 4: In this embodiment, a blank with a brand of C2680, an original specification of 0.8×640 mm, and an M state is cut into products with a specification of 0.8×600 mm.

[0049] In the first step, the inner diameter of the coil is 600mm and the weight is 5426kg; in the second step, the shearing tool is installed according to the shearing width of 600mm and the tolerance is ±1mm. According to the operations of the above steps 3 and 4, in the fifth step, the strip is glued to the sleeve with an inner diameter of 400mm and sheared. When shearing, the loop is adjusted to 0 position, the shearing speed is set to 110m / min, and the speed of the uncoiler and coiler is controlled so that the tension of the uncoiler is set to 1.7N / mm 2 , the coiler tension is set to 1.9N / mm 2 , keep the strip shearing normally. In the sixth step, use a strong light flashlight to inspect the surface of the sheared strip, and there are no bright marks, scratches, cracks and other defects. Then check the weight and weigh the final finished product to get a weight of 4427kg, with a process yield of 81.59%. Finally, the strip is blanked and packaged for storage.

[0050] Embodiment 5: In this embodiment, a blank with a brand of C19400, an original specification of 0.6×630 mm, and an M state is cut into products with a specification of 0.6×600 mm.

[0051] In the first step, the inner diameter of the coil is 600mm and the weight is 7755kg; in the second step, the shearing tool is installed according to the shearing width of 600mm and the tolerance is ±1mm. According to the operations of the third and fourth steps above, in the fifth step, the strip is glued to the sleeve with an inner diameter of 400mm and sheared. When shearing, the looper is adjusted to 0 position, the shearing speed is set to 130m / min, and the speed of the uncoiler and the coiler is controlled so that the tension of the uncoiler is set to 1.4N / mm2 , the coiler tension is set to 1.7N / mm 2 , keep the strip shearing normally. In the sixth step, use a strong light flashlight to inspect the surface of the sheared strip, and there are no bright marks, scratches, cracks and other defects. Then check the weight and weigh the final finished product to get 6348kg, and the process yield is 81.86%. Finally, the strip is blanked and packaged for storage.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Those skilled in the art should understand that the specific implementation modes of the present invention may be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A process for the non-destructive longitudinal shearing of copper and copper alloy strips, characterized in that: During the shearing process, the unwinding tension and coiling tension required for strip shearing are established by coordinating the speeds of the unwinding machine and the coiling machine, and the strip does not contact the pressing plate when passing through the pressing plate; the unwinding tension is 0.8-3.5N / mm 2 , winding tension is 1.0-4.0N / mm 2 .

2. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 1 is characterized in that: During the shearing process, the loop position of the loop pit is adjusted to 0.

3. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 1 is characterized in that: When shearing, start with low speed shearing, observe the equipment parameters and operating status, then increase the shearing speed, and according to the shearing speed, appropriately adjust the rotation speed of the uncoiler and coiler according to the raw material coil diameter and the inner diameter of the coiling sleeve to achieve appropriate uncoiling tension and coiling tension.

4. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 1 is characterized in that: It includes loading operations, tool alignment operations, isolator alignment operations, material threading operations, shearing operations, weight checking operations, blanking operations and packaging and warehousing.

5. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 4, characterized in that: During the feeding operation, use alcohol to wet the gauze, wipe all the rollers and rubber ring surfaces that come into contact with the material, remove foreign matter on the surface, and check whether the stick can rotate flexibly.

6. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 4, characterized in that: During the tool setting operation, use cleaning agent to spray or soak the tool holder, shear shaft and required tool matching tools, and use cotton-free white gauze to wipe the tool holder, shear shaft and tool matching tools. It is qualified if they are still white after wiping.

7. The copper and copper alloy strip surface non-destructive longitudinal shearing production process according to claim 6, characterized in that: The cleaning agent was replaced by acetone.

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