A stamping die for riveting silver contacts to copper tabs

Abstract

The utility model discloses a kind of stamping die for riveting silver contact of copper sheet, including upper die and the lower die with material belt on upper surface transfer, punch hole assembly, punch inner hole assembly, contact feeding assembly, riveting assembly, cutting assembly, press inner edge assembly, press outer edge assembly and cutting finished product assembly are sequentially provided along the moving direction of material belt, the punch cutting shape of cutting assembly on material belt is square frame close to edge positioning hole periphery, it has U-shaped convex strip inwardly protruding, the two side edges of square frame inwardly protrude with convex edge, two first bosses are protruded with two second bosses and the third boss corresponding U-shaped convex strip on the two sides of U-shaped convex strip, the edge of riveting assembly is pressed to the edge corresponding first boss and second boss by press inner edge assembly, workpiece overall outer edge is pressed flat by press outer edge assembly, riveting is realized in mould by setting contact feeding assembly cooperation riveting assembly, and riveting assembly is located before cutting assembly, riveting is formed after punch cutting to avoid the influence of burr on riveting.

Description

Technical Field

[0001] This utility model belongs to the technical field of stamping dies, specifically relating to a stamping die for riveting silver contacts onto copper sheets. Background Technology

[0002] Existing copper sheet products can be riveted to silver contacts in stamping dies to achieve a fixed connection. However, some copper sheet products have relatively complex shapes and contours. After stamping, there are many burrs on the edges and they are unevenly distributed. Burrs near the riveting position can easily interfere with the riveting quality in the die, causing the pressure head to be unable to accurately fit the end face of the silver contact, resulting in uneven riveting pressure distribution. This can lead to the silver contact being cut at an angle on the copper sheet or the riveting depth being deviated, which damages the stability of the riveting structure. In addition, burrs in small gaps can easily remain and form an oxide layer, affecting product quality. Utility Model Content

[0003] The purpose of this invention is to provide a stamping die for riveting silver contacts onto copper sheets, thereby solving the aforementioned problems.

[0004] This utility model is achieved through the following technical solution: a stamping die for riveting silver contacts onto copper sheets, comprising an upper die and a lower die on which a strip of material is conveyed. Between the upper and lower dies, along the moving direction of the strip of material, are sequentially arranged an edge-punching assembly, an inner-hole-punching assembly, a contact feeding assembly, a riveting assembly, a cutting assembly, an inner-edge pressing assembly, an outer-edge pressing assembly, and a finished product cutting assembly. The cutting assembly punches a square frame shape near the edge positioning hole on the strip of material. The cutting assembly punches twice to form a piece connected to the strip of material by a connecting rib. The workpiece has a square frame with a U-shaped protrusion extending inward along the feeding direction. The protruding end of the U-shaped protrusion has an internal riveting hole punched in. The two sides of the square frame have protruding edges for avoiding edge positioning holes. On one side of the square frame on both sides of the U-shaped protrusion, there are two first bosses protruding in the same direction. On the other side, there are two second bosses corresponding to the first bosses and a third boss corresponding to the U-shaped protrusion. The inner edge pressing component presses the edges of the first bosses and the second bosses. The outer edge pressing component presses the outer edge of the entire workpiece.

[0005] Furthermore, the contact feeding assembly includes a vibratory feeder and a pneumatic device. An inverted T-shaped guide groove is connected to one side of the lower mold. The inlet of the inverted T-shaped guide groove is connected to the outlet of the vibratory feeder and the air outlet of the pneumatic device. The outlet of the inverted T-shaped guide groove is connected to the riveting assembly.

[0006] Furthermore, a shaping component is provided between the punching inner hole assembly and the riveting assembly. The shaping component includes a shaping punch disposed in the lower die. The top of the shaping punch includes a hemispherical top, a cylindrical transition portion and an enlarged edge portion. The diameter of the hemispherical top and the cylindrical transition portion is equal to the diameter of the inner riveting hole. The enlarged edge portion expands the lower edge of the inner riveting hole to form a chamfer.

[0007] Furthermore, the upper surface of the lower mold has a blanking chamfer at one end near the cut-out component, and the blanking chamfer is inclined downward at 30° relative to the plane where the material strip is located.

[0008] This invention achieves in-mold riveting by setting a contact feeding component in conjunction with a riveting component, thereby improving product assembly efficiency. The riveting component is located before the cutting component, allowing for riveting before punching to avoid the impact of burrs on the riveting process. Then, an inner edge pressing component performs localized flat pressing on the punched first and second bosses, while an outer edge pressing component performs overall flat pressing. Concentrated pressure is first used to treat the areas prone to burrs due to the tiny gaps between the first and second bosses and the U-shaped protrusions, preventing the formation of an oxide layer. Finally, the outer contour burrs are uniformly flat pressed to optimize burr removal, preventing untreated burrs in the tiny gaps from embedding into the copper substrate surface during subsequent overall flat pressing, thus avoiding surface indentations and damage to material density, ensuring product quality. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structural principle of the mold of this utility model; Figure 2 This is a schematic diagram of the processing principle of the material strip in this utility model; Figure 3 yes Figure 1 Enlarged view of point A in the middle; Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0010] The attached figures are labeled as follows: 11. Upper die; 12. Lower die; 121. Blanking chamfer; 21. Punching hole assembly; 22. Punching inner hole assembly; 23. Contact feeding assembly; 231. Vibratory feeder; 232. Inverted T-shaped guide groove; 25. Cutting assembly; 26. Pressing inner edge assembly; 27. Pressing outer edge assembly; 29. ​​Shaping assembly; 291. Hemispherical top; 292. Columnar transition section; 293. Edge widening section; 3. Material strip; 31. Inner riveting hole; 311. Silver contact; 312. Chamfer; 32. U-shaped protrusion; 33. Protruding edge; 34. First boss; 35. Second boss; 36. Third boss; 37. Connecting rib. Detailed Implementation

[0011] The present invention will be further illustrated below with reference to specific examples and accompanying drawings.

[0012] like Figures 1-4 As shown, this utility model describes a stamping die for riveting silver contacts onto copper sheets. It includes an upper die 11 and a lower die 12 with a strip 3 conveyed on its upper surface. Between the upper die 11 and the lower die 12, along the moving direction of the strip 3, are sequentially arranged a punching hole assembly 21, a punching inner hole assembly 22, a contact feeding assembly 23, a riveting assembly, a cutting assembly 25, an inner edge pressing assembly 26, an outer edge pressing assembly 27, and a finished product cutting assembly. The cutting assembly 25 punches a square frame shape near the edge positioning hole on the strip 3. The cutting assembly 25 punches twice to form a piece connected to the strip 3 by a connecting rib 37. The workpiece has a square frame with a U-shaped protrusion 32 protruding inward along the feeding direction. The protruding end of the U-shaped protrusion 32 is punched with an inner riveting hole 31. The two sides of the square frame have protruding edges 33 for avoiding edge positioning holes. On one side of the square frame on both sides of the U-shaped protrusion 32, there are two first bosses 34 protruding in the same direction. On the other side, there are two second bosses 35 corresponding to the first bosses 34 and a third boss 36 corresponding to the U-shaped protrusion 32 protruding in opposite directions. The inner edge pressing assembly 26 presses the edges of the first bosses 34 and the second bosses 35, and the outer edge pressing assembly 27 presses the outer edge of the whole.

[0013] like Figure 2 and Figure 4 As shown, along the feeding direction of the strip 3, the mold first punches a row of side holes on both sides of the strip 3, and then punches a row of inner riveting holes 31 on the center line of the strip 3 through the inner hole punching assembly 22. The contact feeding assembly 23 feeds the rivet-shaped silver contact 311 to the bottom of the strip 3 and aligns it vertically with the inner riveting holes 31. The riveting assembly presses the silver contact 311 so that it passes through the inner riveting hole 31 and then becomes a head with a width greater than the diameter of the inner riveting hole 31 on the upper part of the strip 3, thereby fixing the silver contact 311 at the inner riveting hole 31. Figure 2 (The blue line indicates the part), and then the cutting assembly 25 punches twice on the strip 3 to form the shape of a single workpiece. Figure 2 (The part indicated by the yellow line in the middle) is connected to the strip 3 on both sides by connecting ribs 37. The single material is a cross shape with two copper sheets of different lengths perpendicularly intersecting. The short copper sheet has a first boss 34 and a second boss 35 on both sides, and the long copper sheet has a third boss 36 and a U-shaped protrusion 32 at both ends. The edge of the short copper sheet is deburred by pressing the inner edge assembly 26. Figure 2 and Figure 4 (The red line indicates the area), press the outer edge component 27 to deburr the outer edge of the whole ( Figure 2 and Figure 4 (The green line indicates the part in the middle), and finally, the connecting rib 37 is cut off by cutting the finished component. Figure 2The final finished material is obtained by referring to the blue lines in the middle of the sky.

[0014] This invention achieves in-mold riveting by setting a contact feeding component 23 in conjunction with a riveting component, thereby improving product assembly efficiency. The riveting component is located before the cutting component 25, and the riveting is performed before punching to avoid the influence of burrs on the riveting. Then, the inner edge pressing component 26 is set to perform local flat pressing on the punched first boss 34 and second boss 35, and the outer edge pressing component 27 performs overall flat pressing. First, concentrated pressure is used to treat the burr-prone areas that are prone to burr formation due to the small gaps between the first boss 34 and second boss 35 and the U-shaped protrusion 32, and timely treatment is used to avoid the formation of an oxide layer. Then, the outer contour burrs are uniformly flat pressed to optimize the burr removal effect and prevent burrs in the untreated local small gaps from embedding into the copper sheet substrate surface due to pressure in the subsequent overall flat pressing process, which would lead to adverse consequences such as surface indentation and damage to material density, thus ensuring the quality of the finished product.

[0015] The contact feeding assembly 23 in this embodiment of the present invention includes a vibratory feeder 231 and a pneumatic device (not shown in the figure). An inverted T-shaped guide groove 232 is externally connected to one side of the lower mold 12. The inlet of the inverted T-shaped guide groove 232 is connected to the outlet of the vibratory feeder 231 and the air outlet of the pneumatic device. The outlet of the inverted T-shaped guide groove 232 is connected to the riveting assembly. When the silver contact 311 in the vibratory feeder 231 enters the inlet of the inverted T-shaped guide groove 232 with its large end facing down, the pneumatic device blows the silver contact 311 to the outlet at the other end of the guide groove and enters the riveting assembly to be riveted and fixed with the inner riveting hole 31 on the material strip 3. The feeding efficiency is high and stable. The pneumatic device can prevent the silver contact 311 from getting stuck in the inverted T-shaped guide groove 232 and causing empty riveting.

[0016] like Figures 1-3 As shown, in this embodiment of the present invention, a shaping component 29 is also provided between the punching inner hole assembly 22 and the riveting assembly. The shaping component 29 includes a shaping punch disposed in the lower die 12. The top of the shaping punch includes a hemispherical top 291, a cylindrical transition portion 292, and an enlarged edge portion 293. The diameter of the hemispherical top 291 and the cylindrical transition portion 292 is equal to the diameter of the inner riveting hole 31. The enlarged edge portion 293 expands the lower edge of the inner riveting hole 31 to form a chamfer 312. By setting the hemispherical top 291 to penetrate the inner riveting hole 31, the burrs generated by the punching of the edge of the inner riveting hole 31 can be removed. By setting the cylindrical transition portion 292 and the enlarged edge portion 293, the chamfer 312 formed at the lower edge of the inner riveting hole 31 is conducive to the alignment and insertion of the silver contact 311 and the inner riveting hole 31 during riveting, and plays a good guiding role.

[0017] In this embodiment of the present invention, a blanking chamfer 121 is provided on the upper surface of the lower mold 12 near the end of the cut-out component. The blanking chamfer 121 is inclined downward at 30° relative to the plane where the strip 3 is located. When the copper sheet is demolded downward under the action of gravity after it leaves the strip 3, the blanking chamfer 121 can prevent the punching edge of the copper sheet from rubbing against the right-angle edge of the upper surface of the lower mold 12, thus ensuring the edge quality of the copper sheet.

[0018] The above embodiments are merely preferred embodiments of the present utility model and are only used to explain the present utility model, not to limit the present utility model. Any changes, substitutions, combinations, simplifications, modifications, etc., made by those skilled in the art without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A stamping die for riveting silver contacts onto copper sheets, comprising an upper die (11) and a lower die (12) with a conveyor belt (3) on its upper surface, characterized in that: Between the upper die (11) and the lower die (12), along the moving direction of the strip (3), are arranged sequentially a punching hole assembly (21), a punching inner hole assembly (22), a contact feeding assembly (23), a riveting assembly, a cutting assembly (25), an inner edge pressing assembly (26), an outer edge pressing assembly (27), and a finished product cutting assembly. The cutting assembly (25) punches a square frame shape near the edge positioning hole on the strip (3). The cutting assembly (25) punches twice to form a workpiece connected to the strip (3) by a connecting rib (37). The square frame has a U-shaped protrusion (32) protruding inward along the feeding direction. The protruding end of the U-shaped protrusion (32) is punched with an inner riveting hole (31). The two sides of the square frame protrude inward with protruding edges (33) for avoiding edge positioning holes. On one side of the square frame on both sides of the U-shaped protrusion (32), there are two first bosses (34) protruding in the same direction. On the other side, there are two second bosses (35) corresponding to the first bosses (34) and a third boss (36) corresponding to the U-shaped protrusion (32) protruding in the opposite direction. The inner edge pressing component (26) presses the edge of the first bosses (34) and the second bosses (35). The outer edge pressing component (27) presses the outer edge of the workpiece.

2. A stamping die for riveting silver contacts onto copper sheets according to claim 1, characterized in that: The contact feeding assembly (23) includes a vibratory plate (231) and a pneumatic device. An inverted T-shaped guide groove (232) is connected to one side of the lower mold (12). The inlet of the inverted T-shaped guide groove (232) is connected to the outlet of the vibratory plate (231) and the air outlet of the pneumatic device. The outlet of the inverted T-shaped guide groove (232) is connected to the riveting assembly.

3. A stamping die for riveting silver contacts onto copper sheets according to claim 1, characterized in that: A shaping component (29) is also provided between the punching inner hole assembly (22) and the riveting assembly. The shaping component (29) includes a shaping punch disposed in the lower die (12). The top of the shaping punch includes a hemispherical top (291), a cylindrical transition portion (292), and an enlarged edge portion (293). The diameter of the hemispherical top (291) and the cylindrical transition portion (292) is equal to the diameter of the inner riveting hole (31). The enlarged edge portion (293) expands the lower edge of the inner riveting hole (31) to form a chamfer (312).

4. A stamping die for riveting silver contacts onto copper sheets according to claim 1, characterized in that: The upper surface of the lower mold (12) near the end of the cut-out component has a material chamfer (121), which is inclined downward at 30° relative to the plane of the material strip (3).

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