Ultrathin rolled copper stamping fuse semi-finished product

Abstract

The utility model relates to an ultra-thin rolled copper stamping fuse semi-finished product, which is formed by stamping a rolled copper material belt with micron-sized thickness, the formed fuse monomer comprises a sheet-shaped copper substrate, the sheet-shaped copper substrate is divided into three areas along the length direction, the three areas are an opening area, a fuse area and an end part area in sequence, and the opening area, the fuse area and the end part area are arranged on the sheet-shaped copper substrate. A plurality of through holes are formed in the opening area at intervals in an array mode; the two ends of the connection portion are connected with the opposite angles of the hole opening area and the end portion area respectively, the bent portion is connected with the two connection portions, a wavy-line-shaped safety portion is arranged in the middle of the bent portion, and the line width of the safety portion is 0.15 + / -0.02 mm and is smaller than the line width of a main body of the bent portion. According to the utility model, the ultra-thin rolled copper foil is punched by adopting a high-precision die punching mode, a fuse semi-finished product is directly formed, particularly, an ultra-thin fuse part is punched and formed at one time, the defects of flanging deformation and the like caused by multiple times of punching are avoided, and the size and the performance of the fuse part are stable.

Description

Technical Field

[0001] This utility model relates to the field of fuses and their manufacturing technology, and specifically to a semi-finished product of an ultra-thin rolled copper stamped fuse. Background Technology

[0002] Traditional fuses mainly include surface mount fuses, blade fuses, tubular fuses, as well as RH block type, RP resistor type, and RY metal-cased resettable fuses. These fuses typically have dimensions of several millimeters or even tens of millimeters or larger. With the development of the electronics industry, the precision requirements for components are increasing. Some high-precision products require specifications below the millimeter level, which traditional fuses cannot meet. For example, batteries, integrated busbars, and wire harnesses used in new energy vehicles and energy storage devices place higher demands on fuse products. Currently, copper-based fuses are manufactured using laser cutting, which has low production efficiency and a low yield rate, approximately 400-500 pieces / hour, with a yield of around 80%. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide an ultra-thin rolled copper stamped fuse semi-finished product.

[0004] The technical solution adopted in this utility model is as follows: a semi-finished ultra-thin rolled copper stamped fuse, which is formed by stamping rolled copper strip with a thickness of micrometers. The fuse unit formed includes a sheet-shaped copper substrate, which is divided into three regions along its length: an opening region, a safety region, and an end region. In the opening region, several through holes are arranged in an array at intervals. The safety region includes a gradually changing width connecting part that connects to the opening region and the end region at opposite corners, and a curved part that connects the two connecting parts. The curved part has a wavy safety part in the middle. The line width of the safety part is 0.15±0.02mm and is smaller than the line width of the main body of the curved part.

[0005] The insurance department has at least two peaks and two troughs.

[0006] The length of the opening area accounts for 60% ± 5% of the total length of the sheet copper substrate; the length of the end area accounts for 10% ± 5% of the total length of the sheet copper substrate, and the remaining area is the safety area.

[0007] The diameter of the through hole is 0.50±0.05mm. The through hole array consists of 12 groups of 3 holes along the length of the sheet copper substrate. The spacing between adjacent through holes along the length of the sheet copper substrate is 2.00±0.05mm, and the spacing between adjacent through holes along the width of the sheet copper substrate is 1.50±0.05mm.

[0008] This invention employs a high-precision die-cutting method to punch ultra-thin rolled copper foil, directly forming a fuse semi-finished product. In particular, the extremely fine fuse part is punched and formed in one go, avoiding defects such as edge deformation caused by multiple punching, thus ensuring the stability of the fuse part's dimensions and performance. The fuse semi-finished product roll of this invention is suitable for die-cutting with film material, so that the fuse part is encapsulated in the film material, exposing the opening area and end area for electrical connection, thereby improving production efficiency and subsequent use efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the fuse semi-finished product of this utility model;

[0010] Figure 2 This is a structural schematic diagram of the semi-finished fuse strip of this utility model (the shaded area in the figure represents the waste material that needs to be removed during stamping).

[0011] Figure 3 This is a schematic diagram of the stamping process for the production of semi-finished fuses according to this utility model (i.e.) Figure 3 The red part in the middle is a schematic diagram of the blade.

[0012] Figure 4 This is a schematic diagram showing the superimposed effects of the stamping process at the second, third, and fourth stations. Detailed Implementation

[0013] like Figures 1-2 As shown, the present invention relates to an ultra-thin rolled copper stamped fuse semi-finished product, which is formed by stamping rolled copper strip with a thickness of micrometers. The formed fuse unit includes a sheet copper substrate 1, which is divided into three regions along its length: an opening region 11, a safety region 12, and an end region 13. The opening region 11 has a plurality of through holes 111 arranged in an array at intervals. The safety region 12 includes a width-gradient connecting portion 121 that connects to the opening region 11 and the end region 13 at opposite corners at both ends, and a bent portion 122 that connects the two connecting portions 121. The bent portion 122 has a wavy safety portion 123 in the middle. The line width of the safety portion 123 is 0.15±0.02mm and is smaller than the line width of the main body of the bent portion 122.

[0014] Insurance section 123 has at least two peaks and two troughs.

[0015] The length of the opening area 11 accounts for 60% ± 5% of the total length of the sheet copper substrate 1; the length of the end area 13 accounts for 10% ± 5% of the total length of the sheet copper substrate 1, and the remaining area is the safety area 12.

[0016] The diameter of the through hole 111 is 0.50±0.05mm. The array of through holes 111 consists of 12 groups of 3 holes each along the length of the sheet copper substrate 1. The spacing between adjacent through holes 111 along the length of the sheet copper substrate 1 is 2.00±0.05mm, and the spacing between adjacent through holes 111 along the width of the sheet copper substrate 1 is 1.50±0.05mm.

[0017] Combination Figures 3-4 As shown, this utility model also provides a production process for the above-mentioned ultra-thin rolled copper stamped fuse semi-finished product. This production process involves punching rolled copper strips with a thickness in the micrometer range according to the following steps:

[0018] S1, through the first station M1 of the mold, punch out the material strip pitch positioning hole 201 and positioning groove 202 on both sides of the rolled copper strip 2 to remove the corresponding hole waste and edge waste;

[0019] S2, the material strip travels two steps and reaches the second station M2. At the second station M2, two adjacent and spaced first closed areas 21 are punched out on the rolled copper strip 2 through the mold. The inner sides of the two first closed areas 21 form a wavy outline 212, which forms a complete wavy fuse part 123 in the fuse. The waste material corresponding to the first closed areas 21 on both sides is removed. The length of the first closed area is equivalent to the length occupied by the wavy outline, and the width is 8-12 times the line width of the fuse part. The wavy fuse part is formed directly and completely in one step, so that the main body of the fuse part is far away from the subsequent processing area, thereby avoiding the fuse part from flanging, deformation, etc., making the dimensions more stable and ensuring product quality.

[0020] S3, the strip travels five steps to the third station M3. At the third station M3, a second closed region 22 is punched out of the rolled copper strip 2 using the die. This second closed region 22 partially overlaps with the outer side of the first closed region 21 on one side. The two intersection points of the second closed region outline 221 and the first closed region outline 211 are the two endpoints J1 of the wavy outline 201 on that side. The second closed region 22 forms part of the connecting and curved sections along other outlines outside the first closed region 21. The inner frame waste of the second closed region 22 is removed.

[0021] S4, the strip travels four steps to the fourth station M4. At the fourth station M4, a third closed region 23 is punched out of the rolled copper strip 2 using the die. This third closed region 23 partially overlaps with the outer side of the first closed region 21 on the other side. The two intersection points of the third closed region outline 231 and the outline 211 of the first closed region on the other side are the two endpoints J2 of the wavy outline on that side. The other outlines of the third closed region 23 outside the first closed region 21 form another part of the outline of the connecting part and the curved part. The inner frame waste of the third closed region is removed. The third closed region 23 does not intersect with the second closed region 22, and the connecting part 121 and the curved part 122 are formed between them. Simultaneously, the fourth station M4 also forms a positioning mark M42 at the lower edge of the strip. Each positioning mark formed on the strip is spaced one step apart.

[0022] S5, the strip moves two steps to the fifth station M5, and two rows of through holes 111 are punched out on the rolled copper strip 2 through the fifth station M5 of the mold. The two rows of through holes 111 are staggered along the width of the strip, and each through hole 111 is in a different row.

[0023] S6, the strip travels two steps to the sixth station M6, and through the sixth station M6 of the mold, two more rows of through holes 111 are punched out on the rolled copper strip 2. The two rows of through holes 111 are staggered along the width direction of the strip, and the two rows of through holes are symmetrical with respect to the center line of the fuse unit compared with the two rows of through holes in step S5.

[0024] S7, the strip travels three steps to the seventh station M7, and through the seventh station M7 of the die, a row of through holes is punched out on the rolled copper strip 2. The row of through holes is located in the middle of the two rows of through holes formed in steps S5 and S6.

[0025] In step S8, the strip travels two steps to the eighth station M8. At the eighth station M8 of the die, another row of through holes is punched out on the rolled copper strip. This row of through holes is also located in the middle of the two rows of through holes in S5 / S6, and is staggered with the through holes formed in S7. That is, the above-mentioned 12*3 through hole array is formed by four punching operations from S5 to S8. Since they are all 0.5mm-level micro holes, concentrated punching should be avoided as much as possible to avoid damaging the strip. This also optimizes the die design and gives the die more design space.

[0026] The die at the first station M1 has a die-cutting edge positioning groove, a step-pitch positioning hole edge cutting edge M11, and a positioning hole cutting edge M12; the die at the second station M2 has two first closed cutting edges M21 corresponding to the shape of the outline of the first closed area; the die at the third station M3 has a second closed cutting edge M31 corresponding to the shape of the outline of the second closed area; the die at the fourth station M4 has a third closed cutting edge M41 corresponding to the shape of the outline of the third closed area; the dies at the fifth station M5, the sixth station M6, the seventh station M7, and the eighth station M8 are respectively provided with through hole cutting edges M51 corresponding to the through holes being formed.

[0027] There are two empty steps between the first station M1 and the second station M2; five empty steps between the second station M2 and the third station M3; four empty steps between the third station M3 and the fourth station M4; two empty steps between the fourth station M4 and the fifth station M5; two empty steps between the fifth station M5 and the sixth station M6; three empty steps between the sixth station M6 and the seventh station M7; and two empty steps between the seventh station M7 and the eighth station M8. Appropriate empty steps are beneficial for waste discharge and the positioning of the material belt during the process.

[0028] This invention employs a high-precision die-cutting method to punch ultra-thin rolled copper foil, directly forming a fuse semi-finished product. In particular, the extremely fine fuse part is punched and formed in one go, avoiding defects such as edge deformation caused by multiple punching, thus ensuring the stability of the fuse part's dimensions and performance. The fuse semi-finished product roll of this invention is suitable for die-cutting with film material, so that the fuse part is encapsulated in the film material, exposing the opening area and end area for electrical connection, thereby improving production efficiency and subsequent use efficiency.

[0029] The above embodiments are merely exemplary implementations used to illustrate the principles of this utility model; however, this utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. An ultra-thin rolled copper stamping fuse semi-product formed by stamping a strip of rolled copper having a thickness in the micrometer range, characterized in that: The resulting fuse unit includes a sheet-shaped copper substrate, which is divided into three regions along its length: an opening region, a fuse region, and an end region. The opening region has several through holes arranged in an array at intervals. The fuse region includes a gradually wide connecting portion that connects to the opening region and the end region at opposite corners, and a curved portion that connects the two connecting portions. The curved portion has a wavy fuse portion in the middle, and the line width of the fuse portion is 0.15±0.02mm, which is smaller than the line width of the main body of the curved portion.

2. The ultra-thin rolled copper stamping fuse semi-product of claim 1, wherein: The insurance department has at least two peaks and two troughs.

3. The ultra-thin rolled copper stamping fuse semi-product of claim 1, wherein: The length of the opening area accounts for 60% ± 5% of the total length of the sheet copper substrate; the length of the end area accounts for 10% ± 5% of the total length of the sheet copper substrate, and the remaining area is the safety area.

4. An ultra-thin rolled copper stamping fuse semi-product according to claim 1 or 3, characterized in that: The diameter of the through hole is 0.50±0.05mm. The through hole array consists of 12 groups of 3 holes along the length of the sheet copper substrate. The spacing between adjacent through holes along the length of the sheet copper substrate is 2.00±0.05mm, and the spacing between adjacent through holes along the width of the sheet copper substrate is 1.50±0.05mm.

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