A steel core winding copper wire method capable of improving stress distribution of a cathode roller titanium cylinder

Abstract

This invention discloses a method for winding copper wire around a steel core to improve the stress distribution of a cathode roller titanium cylinder. The steel core roller surface is divided into three parts: an edge, a middle, and a back edge. Several sets of copper wire coils are wound around each part, with gaps between each set to release stress at the corresponding position on the titanium cylinder. The width of a single set of copper wire coils is the same in the two edge parts, while the width of a single set of copper wire coils in the middle part is greater than that in the two edge parts. The gaps between each set of copper wire coils in the edge and middle parts are consistent. A small distance is left between the starting and ending winding positions of the copper wire coils in the two edge parts and the end face of the steel core to release stress at the edge of the titanium cylinder. The gaps between all the copper wire coils also provide space for stress release in the titanium cylinder. This invention can be used to manufacture cathode roller steel cores of various specifications. Cathode roller steel cores manufactured using this invention have uniform conductivity. After the titanium cylinder is heat-fitted onto the outer surface of the steel core, the stress distribution in the titanium cylinder is uniform, meeting the requirements for cathode rollers used with ultra-thin copper foil.

Description

Technical Field

[0001] This invention relates to the field of manufacturing technology of cathode rollers for electrolytic copper foil, and more specifically to a method for winding copper wire around a steel core that can improve the stress distribution of the titanium cylinder of the cathode roller. Background Technology

[0002] Electrolytic copper foil is widely used in high-tech fields such as chip packaging, printed circuits, and new energy, serving as a key basic material for packaging substrates, printed circuit boards, and lithium battery current collectors. With the development of new energy vehicles, the market demand for lithium-ion batteries is increasing daily, leading to explosive growth in the demand for electrolytic copper foil, the negative electrode current collector material for lithium-ion batteries. This demand has driven the market demand for cathode rollers, a key piece of equipment in electrolytic copper foil production. As domestic copper foil manufacturers invest heavily in cathode rollers, their quality stability has become a key focus, with the residual stress on the titanium cylinder of the cathode roller becoming a focal point. It is well known that residual stress on the cathode roller surface can cause severe defects such as mesh patterns during copper foil production, significantly impacting copper foil quality. Therefore, the core issue for cathode rollers is how to eliminate or reduce residual stress in the titanium cylinder. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a method for winding copper wire around a steel core that improves the stress distribution of the titanium cylinder in a cathode roller. This invention can be used to manufacture cathode roller steel cores of various specifications. Cathode roller steel cores manufactured using this invention exhibit uniform conductivity, and after the titanium cylinder is hot-mounted onto the outer surface of the steel core, the stress distribution of the titanium cylinder is uniform, meeting the requirements for cathode rollers used with extremely thin copper foil.

[0004] The technical solution adopted by this invention to solve the technical problem is: a method for winding copper wire around a steel core to improve the stress distribution of a cathode roller titanium cylinder. The method includes winding a copper coil on the outer surface of the steel cylinder. The diameter of the copper coil is d. The wound copper coil is divided into three parts along the width direction of the steel cylinder, including two side parts and one middle part. Each part consists of several single coils. The total width of the copper coils in the two side parts is L1, and the width of a single coil is K1. The total width of the copper coils in the middle part is L2, and the width of a single coil is K2. There is a gap between the single coils in the side parts and the middle part, and the width of the gap is b. The gap width between the starting and ending points of the coils in the two side parts and the end face of the steel cylinder is a.

[0005] Furthermore, the edge portion includes n single-group coils, and the total width of the copper coils of the edge portion is L1 = n × K1 + (n-1) × b; where n is an integer greater than or equal to 1.

[0006] Preferably, n is an integer, and 5≥n≥2, and the total width of the copper coil at the edge is L1=n×K1+(n-1)×b.

[0007] Furthermore, the middle section includes m single-group coils, and the total width of the copper coils in the middle section is L2 = m × K2 + (m - 1) × b; where m is an integer greater than or equal to 2.

[0008] Preferably, m is an integer, and 6≥m≥3, and the total width of the copper coil at the edge is L2=m×K2+(m-1)×b.

[0009] Furthermore, the edge portion includes n single-group coils, and the total width of the copper coils in the edge portion is L1 = n × K1 + (n-1) × b; where n is an integer greater than or equal to 1; the middle portion includes m single-group coils, and the total width of the copper coils in the middle portion is L2 = m × K2 + (m-1) × b; where m is an integer greater than or equal to 2; the total width of the steel cylinder roller surface is L = 2 × L1 + L2 + 2a + 2b.

[0010] Furthermore, the gap width a between the starting and ending points of the copper coils on the two sides and the end face of the steel cylinder is greater than the gap b between the single coils on the sides and the middle.

[0011] Furthermore, the width K1 of the edge single coil group is smaller than the width K2 of the middle single coil group.

[0012] Furthermore, after the copper coil is wound around the outer surface of the steel cylinder, a titanium cylinder is heat-fitted onto the outer surface of the copper coil.

[0013] The gap 'b' between each pair of single copper coils is used to release the residual stress in the titanium cylinder at the corresponding position. The distance 'a' between the starting and ending points of the two edge copper coils and the end face of the steel cylinder is used to release the residual stress on both ends of the titanium cylinder. The gap formed between each pair of copper coils can also be used to release the residual stress in the titanium cylinder at the corresponding position.

[0014] The beneficial effects of this invention are as follows: Compared with the prior art, this invention provides a method for winding copper wire around a steel core to improve the stress distribution of the titanium cylinder in a cathode roller. The steel core roller surface is divided into three parts: an edge, a middle, and a back edge. Several sets of copper wire coils are wound around each part, with gaps between each set to release stress at the corresponding position in the titanium cylinder. The width of a single set of copper wire coils in the two edge parts is consistent, while the width of a single set of copper wire coils in the middle part is greater than that in the two edge parts. The gaps between each set of copper wire coils in the edge and middle parts are consistent. A small distance is left between the starting and ending winding positions of the copper wire coils in the two edge parts and the end face of the steel core to release stress at the edge of the titanium cylinder. The gaps between all the copper wire coils also provide space for stress release in the titanium cylinder. This invention can be used to manufacture steel cores for cathode rollers of various specifications. The cathode roller steel core manufactured using this invention has uniform conductivity. After the titanium cylinder is hot-mounted onto the outer surface of the steel core, the stress distribution in the titanium cylinder is uniform, which can meet the requirements for use in cathode rollers for ultra-thin copper foil. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the cathode roller steel core and the wound copper wire of the present invention.

[0016] Wherein, 1-steel cylinder; 2-copper coil. Detailed Implementation

[0017] The present invention will be further illustrated below with specific embodiments. However, these examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] like Figure 1 As shown, a method for winding copper wire around a steel core to improve stress distribution in a cathode roller titanium cylinder is disclosed. The method includes winding a copper coil on the outer surface of the steel cylinder. The diameter of the copper coil is d. The wound copper coil is divided into three parts along the width direction of the steel cylinder, including two side sections and a middle section. Each part consists of several single coils. The total width of the copper coils in the two side sections is L1, and the width of a single coil is K1. The total width of the copper coils in the middle section is L2, and the width of a single coil is K2. A gap with a width of b is left between the single coils in the side sections and the middle section. The gap width between the starting and ending points of the winding of the coils in the two side sections and the end face of the steel cylinder is a.

[0019] The edge portion includes n single-group coils, and the total width of the copper coils in the edge portion is L1 = n × K1 + (n-1) × b; where n is an integer greater than or equal to 1; the middle portion includes m single-group coils, and the total width of the copper coils in the middle portion is L2 = m × K2 + (m-1) × b; where m is an integer greater than or equal to 2; the total width of the steel cylinder roller surface is L = 2 × L1 + L2 + 2a + 2b.

[0020] The gap width 'a' between the starting and ending points of the copper coils on the two sides and the end face of the steel cylinder is greater than the gap 'b' between the single coil sets on the sides and the middle. The width K1 of the single coil set on the sides is smaller than the width K2 of the single coil set in the middle. After the copper coils are wound around the outer surface of the steel cylinder, a titanium cylinder is heat-fitted onto the outer surface of the copper coils.

[0021] Example 1

[0022] In this embodiment, the diameter of the cathode roller The width is 1500mm. Specific parameters are as follows:

[0023] d=2.5mm, a=3mm, b=2mm, K1=189mm, K2=242mm, L1=380mm, L2=730mm, L=1500mm, n=2, m=3.

[0024] Example 2

[0025] In this embodiment, the diameter of the cathode roller The width is 1820mm. Specific parameters are as follows:

[0026] d=2.5mm, a=3mm, b=2mm, K1=150mm, K2=224mm, L1=454mm, L2=902mm, L=1820mm, n=3, m=4.

[0027] Example 3

[0028] In this embodiment, the diameter of the cathode roller The width is 1380mm. Specific parameters are as follows:

[0029] d=3mm, a=3mm, b=2mm, K1=190mm, K2=240mm, L1=382mm, L2=724mm, L=1380mm, n=2, m=3.

[0030] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A method for winding copper wire around a steel core to improve stress distribution in a cathode roller titanium cylinder, characterized in that: The method includes winding a copper coil with a diameter of d around the outer surface of a steel cylinder. The wound copper coil is divided into three parts along the width direction of the steel cylinder, including two side sections and a middle section. The total width of the copper coils in the two side sections is L1, and the width of a single coil group is K1. The total width of the copper coils in the middle section is L2, and the width of a single coil group is K2. A gap with a width of b is left between the single coil groups in the side sections and the middle section. The gap width between the starting and ending points of the coils in the two side sections and the end face of the steel cylinder is a. The gap width a between the starting and ending points of the copper coils in the two side sections and the end face of the steel cylinder is greater than the gap b between the single coil groups in the side sections and the middle section. The width K1 of the single coil group in the side section is smaller than the width K2 of the single coil group in the middle section. The edge portion includes n single-group coils, where n is an integer and 5≥n≥2. The total width of the copper coils in the edge portion is L1=n×K1+(n-1)×b; The middle section includes m single coils, where m is an integer and 6 ≥ m ≥ 3. The total width of the copper coils in the middle section is L2 = m × K2 + (m - 1) × b. The total width of the steel cylinder roller surface is L = 2 × L1 + L2 + 2a + 2b.

2. The method for improving the stress distribution of the cathode roller titanium cylinder by winding copper wire around a steel core as described in claim 1, characterized in that: After the copper coil is wound around the outer surface of the steel cylinder, a titanium cylinder is heat-fitted onto the outer surface of the copper coil.

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