Process for improving collapse of inner ring of 0.1-0.15 mm elastic-hard copper strip in cutting and splitting process
By employing staged tension control and specific paper core and roll expansion and contraction pressures during the copper strip slitting process, the problem of inner ring collapse in ultra-thin copper strip slitting has been solved, achieving efficient burr control and prevention of inner ring collapse, thereby improving production stability and yield.
Patent Information
- Application Number
- CN202511990381.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-03
AI Technical Summary
Although existing technologies can effectively control burrs during copper strip slitting, the problem of inner ring collapse still exists, leading to material waste and increased production costs. This is especially true in the slitting of ultra-thin, elastic, and hard copper strips of 0.1 to 0.15 mm, where the inner ring collapse rate is as high as 15% to 20%.
A phased tension control method is adopted, which combines specific paper core strength and roll expansion and contraction pressure. The paper is slit by a B+S slitting machine. The axial and radial cutter gaps are set, and the winding tension is adjusted during the slitting process to form a stable inner ring structure to prevent collapse.
It significantly reduced the inner ring collapse rate to zero, improved the neatness of the end face of the slitting roll, facilitated transportation and storage, reduced downtime, improved production efficiency and yield, and reduced production costs.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of copper processing technology, specifically relating to the slitting and production process of alloy copper strip, and a winding process for slitting machines that can effectively improve the inner ring collapse defect of ultra-thin elastic hard copper strip slitting. Background Technology
[0002] In the copper and copper alloy strip processing industry, disc slitting machines are the mainstream equipment for slitting sheet metal. For ultra-thin, elastic, and hard copper strips with a thickness between 0.1mm and 0.15mm, slitting faces two major quality challenges: edge burrs and inner coil collapse during winding.
[0003] Existing technologies typically address burr issues by optimizing tool clearance (axial and radial) and adjusting a single winding tension. For example, controlling the axial clearance to a very small range and setting the radial clearance to a specific proportion of the plate thickness can effectively keep burrs at a low level (e.g., less than 0.02 mm), meeting the requirements of high-speed punching dies.
[0004] However, while the aforementioned conventional process parameter optimizations can effectively address the burr problem, they have little effect on "inner ring collapse," and in some cases, may even exacerbate it. Inner ring collapse refers to the localized depressions or deformations that occur in the inner layers of the coil after slitting and winding due to uneven stress, severely impacting subsequent transportation, storage, and unwinding. Under current technological conditions, the average inner ring collapse rate of 0.1~0.15mm elastic-hard copper strip after slitting is as high as 15%~20%, resulting in significant material waste and increased production costs.
[0005] The cause of inner ring collapse is closely related to the dynamic distribution of tension during winding, the supporting strength of the paper core, and the stress state within the roll. Using constant tension throughout the slitting process cannot adapt to the changing stress requirements from the core to the outer diameter, easily leading to an overly tight inner ring and a loose outer ring, thus causing inner ring collapse. Therefore, there is an urgent need in this field for a comprehensive slitting and winding process that can simultaneously control burrs and prevent inner ring collapse. Summary of the Invention
[0006] This invention discloses an improved process for inner ring collapse during slitting of 0.1~0.15mm elastic-hard copper strip. The purpose of this invention is to overcome the shortcomings of the prior art and provide a process for improving inner ring collapse during slitting of ultra-thin elastic-hard copper strip. This process can not only effectively control slitting burrs, but also fundamentally solve the problem of inner ring collapse through an innovative tension control strategy.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: a process for improving the inner ring collapse of ultra-thin elastic hard copper strip, the core of which lies in combining the burr control process with the targeted anti-collapse winding process, and in particular, adopting a staged tension control method.
[0008] The process specifically includes:
[0009] Burr control parameters: Using a B+S slitting machine, the axial cutter clearance is set to 0.005mm, and the radial cutter clearance is 80% of the copper strip thickness. This combination of process parameters ensures that the burrs are less than 0.02mm and the width tolerance is ±0.04mm.
[0010] Anti-collapse winding system: It adopts a high-strength paper core with a radial crushing force of 3200N / mm and the roll expansion and contraction pressure is set at 24%, providing a stable basis for staged tension control.
[0011] Staged tension control:
[0012] Phase 1 (first 500 meters): Use a high winding tension of 9.5 N / mm 2 During this stage, supported by a high-strength paper core, the inner ring of the roll is tightly and smoothly wound around the paper core with greater tension, forming a solid "core" that provides a stable foundation for subsequent winding.
[0013] Second stage (after 500 meters): Reduce the winding tension to 8 N / mm. 2 As the roll diameter increases, reducing tension can prevent the outer copper strip from exerting excessive clamping force on the inner ring, thereby releasing internal stress and effectively preventing the inner ring from collapsing due to the stress difference between the inner and outer layers.
[0014] Auxiliary process: Set the height difference between odd and even number of copper strip loopers to 1.5~2 meters, and flip the odd number strips to balance the strip stress and ensure that the slitting speed can reach more than 150m / min.
[0015] The advantages and beneficial effects of this invention are as follows:
[0016] 1. This invention, through a complete system of process parameters and staged tension control, combined with specific paper cores and expansion / contraction pressure, significantly reduces the inner ring collapse rate of slitting from 15-20% in existing technologies to zero, achieving a qualitative leap. The key to this invention lies in simultaneously overcoming the two major technical bottlenecks of "burrs" and "inner ring collapse" in ultra-thin, elastic, and rigid copper strip slitting. Optimizing only a single factor in tool clearance, paper core strength, or tension control cannot simultaneously solve the problems of burrs and inner ring collapse. Only through a synergistic process system of high-strength paper cores, precise expansion / contraction pressure, and staged tension control can these two key technical problems be solved.
[0017] 2. Due to the elimination of inner ring collapse, the neatness of the end faces of the slit rolls is significantly improved, facilitating subsequent transportation, storage, and automated unwinding, and reducing downtime for refining due to uneven roll shape. This process can still operate stably at high speeds, ensuring quality while also improving production efficiency compared to before the improvement. Simultaneously, the yield rate is significantly increased due to the complete resolution of the collapse problem, resulting in a substantial reduction in production costs.
[0018] 3. All process parameters in this invention are clear and controllable, making it easy to implement and promote on existing B+S slitting machines. It is suitable for slitting production of ultra-thin, elastic, and hard copper strips of various specifications from 0.1 to 0.15 mm. Attached Figure Description
[0019] Figure 1 This is a flowchart illustrating the process technology route of an embodiment of the present invention.
[0020] Figure 2 This is a schematic diagram showing the collapse of the inner ring of the copper strip after slitting using existing technology (before improvement).
[0021] Figure 3 This is a schematic diagram of the inner ring state of the copper strip after slitting using the process of this invention (after improvement). Detailed Implementation
[0022] The present invention will be further described in detail below with reference to the embodiments. However, the scope of protection of the present invention is not limited to the following embodiments.
[0023] Example 1
[0024] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.11mm*58mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.8m. A 24% expansion / contraction pressure is used on the roll, with 9.5N / mm pressure applied to the first 500m. 2 After slitting the strips to 500 meters, the tension was adjusted to 8 N / mm. 2 No inner ring collapse occurred in the copper strip after the cutting was completed.
[0025] Example 2
[0026] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.10mm*29mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.5m. A 24% expansion / contraction pressure is used on the reel, with 9.5N / mm pressure applied to the first 500m. 2 After slitting the strips to 500 meters, the tension was adjusted to 8 N / mm. 2 No inner ring collapse occurred in the copper strip after the cutting was completed.
[0027] Example 3
[0028] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.15mm*54mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loops is maintained at 2m. A 24% expansion / contraction pressure is used on the reel. A tension of 9.5N / mm² is used for the first 500 meters. After slitting to 500 meters, the winding tension is adjusted to 8N / mm². 2 No inner ring collapse occurred in the copper strip after the cutting was completed.
[0029] Comparative Example 1
[0030] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.11mm*58mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.8m. A 24% expansion / contraction pressure is used on the reel, with a total pressure of 9.0N / mm throughout the process. 2 The winding tension is maintained until the slitting is completed.
[0031] Comparative Example 2
[0032] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.11mm*58mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 2500N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.8m. A 24% expansion / contraction pressure is used on the roll, with 9.5N / mm pressure applied to the first 500m. 2 After slitting the strips to 500 meters, the tension was adjusted to 8 N / mm. 2 Once the cutting is complete.
[0033] Comparative Example 3
[0034] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.11mm*58mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.8m. The roll expansion and contraction pressure is 18%, with 9.5N / mm used for the first 500m. 2 After slitting the strips to 500 meters, the tension was adjusted to 8 N / mm. 2 Once the cutting is complete.
[0035] Comparative Example 4
[0036] The B+S slitting machine is used to slit extra-hard, ultra-thin copper strips with a thickness and width of 0.11mm*58mm. An axial cutter clearance of 0.005mm and a radial cutter clearance of 80% of the sheet thickness are used for slitting, controlling burrs to less than 0.02mm and a width tolerance of ±0.04mm. A paper core with a radial crushing force of 3200N / mm is used for winding. Odd-numbered copper strips are flipped, and the height difference between odd and even-numbered copper strip loopers is maintained at 1.8m. A 24% expansion / contraction pressure is used on the roll, with 9.5N / mm pressure applied to the first 500m. 2 After slitting the strips to 500 meters, the tension was adjusted to 7 N / mm. 2 Once the cutting is complete.
[0037] This invention effectively constructs a robust inner ring structure and releases outer layer stress by synergistically employing specific tool clearances (0.005mm axially, 80% of the board thickness radially), a high-strength paper core (radial crushing force 3200N / mm), staged tension control (maintaining 9.5N / mm² for the first 500m, then adjusting to 8N / mm²), and appropriate roll expansion and contraction pressure (24%) and looper height difference. This prevents inner ring collapse while controlling burrs and width tolerances. In contrast, comparative examples, due to changes in a single parameter—such as constant tension throughout the entire process in Comparative Example 1 leading to insufficient inner ring support, insufficient paper core strength in Comparative Example 2 causing deformation, excessively low expansion and contraction pressure in Comparative Example 3 causing slippage, and linearly decreasing tension in Comparative Example 4 failing to form a stable core—all exhibited varying degrees of collapse (5%-30%). The specific process of the present invention is shown in the embodiments. Its advantage lies in the synergistic effect of these key parameters, especially the staged tension control, which can effectively solve the problem of inner ring collapse of ultra-thin copper strip while ensuring the slitting quality, thereby improving production stability and yield.
[0038] Performance testing:
[0039] Burr measurement: Select at least 10 copper strip samples from each batch, take 3 measuring points for each strip, and measure the average burr height according to GB / T17793-2010.
[0040] Width tolerance measurement: Take at least 10 copper strip samples from each batch, and take 5 equally spaced points (both ends + the middle) for each strip. Measure the width tolerance in accordance with GB / T17793-2010.
[0041] Collapse rate: Inner circle collapse usually refers to the deformation, loosening or "chrysanthemum-shaped" cracking of the inner layer (such as the first 20 turns) of the copper strip near the paper core when the expansion and contraction shaft retracts after winding is completed. This is caused by excessive radial pressure or insufficient support, resulting in loss of regular roundness. Take 20 samples after slitting and observe whether the inner 20 turns of the roll deform at the moment the expansion and contraction shaft is depressurized (retracted). Use a 500mm long ruler and feeler gauge to check. The collapse depth should not exceed 1mm. If it exceeds this, it is recorded as inner circle collapse.
[0042] The results are shown in Table 1 below.
[0043] Table 1
[0044] Group Burr height (mm) Width tolerance (mm) Collapse rate (%) Example 1 0.012 0.02 0 Example 2 0.014 0.03 0 Example 3 0.015 0.02 0 Comparative Example 1 0.020 0.04 30 Comparative Example 2 0.018 0.03 25 Comparative Example 3 0.019 0.04 20 Comparative Example 4 0.016 0.02 5
Claims
1. An improved process for cutting and slitting 0.1~0.15mm elastic-hard copper strip, characterized in that, Includes the following steps: a. Use a B+S slitting machine to slit ultra-thin, elastic, and hard copper strips, setting the axial cutter clearance to 0.005mm and the radial cutter clearance to 80% of the thickness of the copper strip to be slit; b. Use a paper core with a radial crushing force of 3200 N / mm for winding, and set the roll expansion and contraction pressure to 24%; c. Control the tension of the roll in stages; d. Use an odd number of strips for flipping, and control the height difference between the odd and even number of copper strip loops to be 1.5~2m. The slitting speed should not be less than 150 meters / minute.
2. The process according to claim 1, characterized in that, In step (c), the winding tension control during the staged winding tension control is set at 8-9.5 N / mm. 2 .
3. The process according to claim 2, characterized in that, The control of the phased winding tension in step (c) is specifically as follows: for the first 500 meters after slitting begins, use 9.5 N / mm. 2 After the slitting length reaches 500 meters, the winding tension should be adjusted to 8 N / mm. 2 And maintain this tension until the cutting is complete.
4. The process according to claim 1, characterized in that, In step (a), by setting the tool gap, the burrs generated by slitting are controlled to be below 0.02mm, and the slitting width tolerance is controlled to be within ±0.04mm.
5. The process according to claim 1, characterized in that, The thickness of the ultrathin, elastic, and rigid copper strip ranges from 0.1 mm to 0.15 mm.