A coiling sleeve for improving the strip shape of copper alloy thick strip
By designing a bite jaw and a strip head buffer on the winding sleeve, the problem of creases during the winding of copper alloy strips has been solved, improving the strip shape quality and yield. It is applicable to strips and sheets of various alloy materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI CHUNLEI COPPER CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-12
AI Technical Summary
Copper and copper alloy strips are prone to forming obvious creases when coiled, especially in the case of high-strength, high-conductivity alloy C7025. These creases are difficult to completely eliminate in subsequent processes, affecting product quality and yield.
Design a winding sleeve to improve the shape of thick copper alloy strip. The outer circumference of the sleeve is provided with a biting jaw and a strip head buffer. The biting jaw is at a 45-degree angle to the tangent, and the strip head buffer is at a 135-degree angle to the biting jaw. The depth of the biting jaw is ten times the depth of the strip head buffer. The buffer has a smooth transition and the length of the buffer is the same as the width of the sleeve.
It effectively improves the problem of inner ring creases in copper alloy strips, enhances strip shape quality, increases product yield, and is suitable for strip shape control of various alloy materials.
Smart Images
Figure CN224350161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the winding technology of copper and copper alloy strip, specifically a winding sleeve for improving the shape of thick copper alloy strip. Background Technology
[0002] In recent years, with the rapid development of industries such as 5G networks, electronic information, new energy vehicles, and intelligent manufacturing, the application fields of copper strip materials have increased accordingly, and they are widely used in various high-tech fields such as next-generation electronic information, high-end equipment, new energy, transportation, and aerospace. The copper strip industry is also gradually developing rapidly towards high strength, high conductivity, high elasticity, high surface area, and high shape.
[0003] Taking high-strength, high-conductivity copper alloy (C7025) for electronic connectors as an example, the copper alloy strip must possess high yield strength, high elastic modulus, high conductivity, excellent bending performance (low r / t), excellent fatigue resistance, and high thermal conductivity. Furthermore, since the strip undergoes surface electroplating or stamping after slitting, high-speed stamping presses and precision dies impose higher requirements on the copper strip shape, such as: flatness ≤0.7%, bend <1mm / m, warpage ≤40mm, and transverse bend <2mm.
[0004] Currently, the production of 0.5-2.0mm thick high-strength, high-conductivity copper alloy (C7025) strip often employs a method of tightly gripping the strip end with clamps during finished product rolling and winding. Due to the strip's thickness, the strip end forms a bulge where the clamps forcefully bend it, resulting in a crease forming on the inner coil of the copper strip with each turn (e.g., ...). Figure 1 As shown), it gradually expands outwards to the half-roll position. Moreover, C7025 alloy is a shape memory alloy with high strength and high elasticity. Once a crease is formed, it is difficult to eliminate even if it is straightened by a bending and straightening machine in the subsequent process. Utility Model Content
[0005] This invention addresses the technical problem of noticeable creases forming on copper and copper alloy strips during winding by providing a winding sleeve that improves the shape of thick copper alloy strips.
[0006] This utility model is achieved using the following technical solution: a winding sleeve for improving the shape of thick copper alloy strip, comprising a sleeve; a jaw is transversely cut at any position on the outer circular surface of the sleeve, the length of the jaw is the same as the width of the outer circular surface of the sleeve, and the opening of the jaw is greater than or equal to the thickness of the thick copper alloy strip; the cutting direction of the jaw forms a certain angle with the tangent at its position, causing the jaw to tilt in a certain direction; a head buffer is also machined on the outer circular surface of the sleeve, close to the side of the jaw tilted towards, the length of the head buffer is the same as the width of the outer circular surface of the sleeve; one end of the head buffer is close to the side of the jaw, and the other end of the head buffer extends away from the jaw, the head buffer has the greatest depth at one end, and the depth smoothly transitions to 0 from one end to the other; the maximum depth of the head buffer is less than the depth of the jaw.
[0007] Furthermore, the jaws of the bite are at a 45-degree angle to the tangent at the position of the outer circle of the sleeve.
[0008] Furthermore, the turning direction of the head buffer zone forms a 135° angle with the cutting direction of the jaws.
[0009] Furthermore, the jaw depth is at least ten times the maximum depth of the head buffer zone; the jaw opening is equal to 1-4 times the thickness of the copper alloy strip.
[0010] This invention requires minimal investment and yields quick results. By improving the sleeve, it effectively addresses the issue of creases on the inner ring of 0.5-2.0mm thick high-strength, high-conductivity copper alloy strips, thereby improving the shape quality of the thick strips and increasing the yield rate of thick alloy products.
[0011] This utility model has an ingenious design and a simple structure. Through simple improvements, it has achieved very good technical results and can be extended to the quality control of other copper and copper alloys, aluminum and aluminum alloys, nickel and nickel alloys, steel and other sheet and strip materials. Its application range is wide. Attached Figure Description
[0012] Figure 1 A schematic diagram of folding formation in the prior art.
[0013] Figure 2 Schematic diagram of the coiled sleeve structure described in this utility model.
[0014] Figure 3 A schematic diagram of the use of the coiled sleeve described in this utility model.
[0015] Figure 4 This utility model presents a cross-sectional view of the coiled sleeve structure (including dimensions).
[0016] Figure 5 A schematic diagram of the axial structure of the coiled sleeve described in this utility model.
[0017] Figure 6 for Figure 5 The enlarged diagram of A in the figure (R2 and R5 in the figure represent rounded corners to prevent scratches).
[0018] 1-Sleeve, 2-Clamping jaws, 3-Head buffer zone, 4-Copper strip, 5-Wrap, 6-Wrapping clamping copper strip head, 7-Head bending protrusion forming crease. Detailed Implementation
[0019] Example 1: A winding sleeve for improving the shape of thick copper alloy strip includes a sleeve 1. A jaw 2 is transversely cut at any position on the outer surface of the sleeve 1. The length of the jaw 2 is the same as the width of the outer surface of the sleeve 1. The cutting direction of the jaw 2 forms a certain angle with the tangent at its position, causing the jaw 2 to tilt in a certain direction. A strip buffer 3 is also machined on the outer surface of the sleeve 1, closely adhering to the side of the jaw 2. The length of the strip buffer 3 is the same as the width of the outer surface of the sleeve 1. One end of the strip buffer 3 is close to the side of the jaw 2, and the other end extends away from the jaw 2. The strip buffer 3 has the greatest depth at one end, and the depth smoothly transitions to 0 from one end to the other. The maximum depth of the strip buffer 3 is less than the depth of the jaw 2. The jaw 2 forms a 45-degree angle with the tangent at its position on the outer surface of the sleeve 1.
[0020] Due to the special nature of the structure of this utility model, and considering the need to be consistent with the traditional expression in the field of turning, it is necessary to specifically explain in the above description that the transverse cutting jaw 2 refers to the jaw 2 being cut transversely along the outer circumferential surface of the sleeve 1, with its direction being orthogonal to the outer circumference; the opening degree of the jaw 2 refers to its opening size, and the length of the jaw 2 and the head buffer 3 corresponds to the width of the sleeve 1.
[0021] Example 2: The turning direction of the head buffer 3 forms a 135° angle with the cutting direction of the jaws 2; the depth of the jaws 2 is at least ten times the maximum depth of the head buffer 3.
[0022] The present invention will be further described below with reference to the accompanying drawings. The present invention is particularly applicable to copper and copper alloy strips, with a thickness of 0.5-2.0 mm, tensile strength Rm > 550 MPa, and yield strength > 450 MPa. It provides a control technology to prevent creases on the inner ring of the coil during the rolling process of high-strength, high-conductivity thick copper alloy strips. Specifically, it is a winding sleeve that improves the shape of the thick copper alloy strip, including jaws and a strip head buffer.
[0023] like Figure 2-6 As shown, the specific embodiments of this utility model are as follows:
[0024] 1. Select a sleeve with the following specifications: inner diameter φ502mm, outer diameter φ620mm (wall thickness 59mm), and width 450mm; sleeve material: chromium molybdenum steel, steel, cast iron, etc. are all acceptable.
[0025] 2. (e.g.) Figure 5 , 6 (As shown) A transverse cut is made at any position on the outer surface of the sleeve to serve as a clamping jaw for the copper strip head.
[0026] Cutting direction: at a 45° angle to the tangent direction;
[0027] Cutting length: same as sleeve width 450mm;
[0028] Opening size: 2mm;
[0029] Cutting depth: 23.01mm
[0030] 3. A buffer zone is machined on one side of the opening on the outer surface of the sleeve.
[0031] Turning direction: along the tangent direction, forming a 135° angle with the opening inclined plane;
[0032] Turning length: same as sleeve width 450mm;
[0033] Turning width: 34.33 mm (this width is equivalent to the outer circumference of the sleeve);
[0034] Turning depth: Maximum 2mm, smooth transition from the opening side to the other side, with the dimension transitioning from 2mm to 0mm.
[0035] 4. The sleeve is fed to the rolling mill by a feeding trolley for winding and tensioning;
[0036] 5. Insert the head of the copper strip into the sleeve clamping jaws, rotate to wind it up, and roll it into a sheet;
[0037] 6. When winding the copper strip, observe the interlocking joint; no creases were found between the overlapping layers. Figure 3 (As shown).
Claims
1. A winding sleeve for improving the shape of thick copper alloy strip, comprising a sleeve (1); characterized in that, A jaw (2) is cut laterally at any position on the outer circular surface of the sleeve (1). The length of the jaw (2) is the same as the width of the outer circular surface of the sleeve (1). The opening of the jaw (2) is greater than or equal to the thickness of the copper alloy strip. The cutting direction of the jaw (2) forms a certain angle with the tangent at its position, causing the jaw (2) to tilt in a certain direction. A head buffer (3) is also machined on the side of the outer circular surface of the sleeve (1) that is close to the jaw (2) and tilted. The length of the head buffer (3) is the same as the width of the outer circular surface of the sleeve (1). One end of the head buffer (3) is close to the side of the jaw (2), and the other end of the head buffer (3) extends away from the jaw (2). The head buffer (3) has the greatest depth at one end, and the depth smoothly transitions to 0 from one end to the other end. The maximum depth of the head buffer (3) is less than the depth of the jaw (2).
2. The winding sleeve for improving the shape of thick copper alloy strip as described in claim 1, characterized in that, The jaws (2) of the bite are at a 45-degree angle to the tangent at the outer circular surface of the sleeve (1).
3. A winding sleeve for improving the shape of thick copper alloy strips as described in claim 2, characterized in that, The turning direction of the head buffer (3) forms a 135° angle with the cutting direction of the jaws (2).
4. A winding sleeve for improving the shape of thick copper alloy strips as described in claim 3, characterized in that, The depth of the jaws (2) is at least ten times the maximum depth of the head buffer zone (3); the opening of the jaws (2) is equal to 1-4 times the thickness of the copper alloy strip.