Chain sheet stamping die

Abstract

The utility model discloses a chain sheet stamping die which comprises a lower die base and an upper die base, a punching structure and a sheet stamping structure are arranged on the upper die base, the sheet stamping structure comprises a sheet stamping male die arranged on the upper die base and a sheet stamping female die arranged on the lower die base, and two pin shafts are arranged on the sheet stamping male die. When the punching male die is used for punching, the two pin shafts extend into the two shaft holes, subjected to hole repairing, of the chain piece, and the diameter of the pin shafts is the same as that of the standard shaft holes. The two pin shafts are arranged on the sheet forming male die, the pin shafts extend into the shaft holes to support the shaft holes when sheet forming is conducted, and the situation that the shaft holes shrink when sheet forming is conducted is effectively avoided.

Description

Technical Field

[0001] The utility model relates to a chain plate stamping die, in particular to a chain plate stamping die. Background Art

[0002] In the design of vehicles (especially bicycles and motorcycles), chains play a vital role, such as transmission chains.

[0003] Chains, roller chains, ductile chains, etc. all have their own application scenarios. Regardless of the purpose, the quality of the chain is the guarantee of its normal operation.

[0004] The patent application number of our company is CN202321321450.1, which discloses a stamping die for chain sheets, including a lower die base and an upper die base. The lower die base is provided with a punching die group, a positioning hole group and a blanking hole die group in sequence. The upper die base and the lower die base are also provided with a group of matching hole repairing punch die group and hole repairing die group respectively. The hole repairing die group is arranged between the positioning hole group and the blanking hole group. The hole repairing die group includes two hole repairing dies. The aperture of the punching die is smaller than the aperture of the chain sheet shaft hole, and the aperture of the hole repairing die is the same as the aperture of the chain sheet shaft hole. The utility model improves the mold. During punching and forming, a through hole smaller than the diameter of the shaft hole is formed on the coil. After positioning, the through hole formed by the first punching step is repaired to a standard shaft hole, and finally the chain plate shape is formed by punching. In this process, the punching of the shaft hole is divided into two steps - punching and repairing. The quality of the shaft hole can be greatly improved, and a standard shaft hole can be obtained, which provides guarantee for the subsequent installation of the chain plate.

[0005] However, another problem arose during the stamping process. That is, when stamping into sheets in the last step, the shaft hole would shrink, resulting in non-standard shaft hole. Utility Model Content

[0006] Based on the disadvantage in the prior art that when the die is punched into a piece, the shaft hole may shrink, resulting in a non-standard shaft hole, the utility model provides a chain plate punching die.

[0007] The technical solution adopted by the utility model to solve the above technical problems is:

[0008] The chain plate stamping die includes a lower die base and an upper die base. The upper die base is provided with a punching structure and a sheet structure. The sheet structure includes a sheet punch provided on the upper die base and a sheet die provided on the lower die base. The sheet punch is provided with two pins. When the sheet punch is used to punch the sheet, the two pins extend into two axial holes on the chain plate after the holes are repaired, and the diameter of the pins is the same as the diameter of the standard axial holes. In this scheme, two pins are provided on the sheet punch. When the sheet is stamped, the pins extend into the axial holes to support the axial holes, thereby effectively avoiding the shrinkage of the axial holes when stamping the sheets.

[0009] Preferably, the punching structure includes a punching die group, a positioning hole group and a hole repairing die group which are sequentially arranged on the lower die base, the punching die group includes two punching dies, the positioning hole group includes two positioning dies, the hole repairing die group includes two hole repairing dies, and the upper die base is provided with a punch die group cooperating with the above-mentioned dies, the aperture of the punching die is smaller than the aperture of the chain sheet shaft hole, and the aperture of the hole repairing die is the same as the aperture of the chain sheet shaft hole.

[0010] Preferably, the punching die is a cylindrical through hole or groove.

[0011] Preferably, the positioning die is a cylindrical through hole or groove.

[0012] Preferably, the hole repairing die is a cylindrical through hole or groove.

[0013] Preferably, the blanking die is a through hole whose shape matches the shape of the chain sheet.

[0014] Preferably, the punching die is provided with two cylindrical holes, pins are installed in the cylindrical holes, and the pins are interference fit with the walls of the cylindrical holes.

[0015] Preferably, the end of the pin shaft exceeds the end face of the punching punch and the length of the exceeding portion is greater than or equal to the length of the chain plate shaft hole.

[0016] Preferably, the upper die base and the lower die base are provided with a plurality of groups of punching structures and punching sheet structures.

[0017] Preferably, a guide column is provided on the lower die seat, a guide sleeve is slidably provided on the guide column, a buffer spring is provided on the guide column and the top end of the buffer spring abuts against the bottom end of the guide sleeve, and the upper die seat is fixed on the guide sleeve.

[0018] Compared with the prior art, the utility model has the following advantages: the utility model provides two pins on the sheet-forming punch, and the pins extend into the shaft hole to support the shaft hole when punching into sheets, thereby effectively avoiding the shrinkage of the shaft hole when punching into sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0020] Figure 1 The exploded view of the two mold bases;

[0021] Figure 2A three-dimensional diagram of the upper die base;

[0022] Figure 3 It is a three-dimensional diagram of the lower die base;

[0023] In the figure: 10, lower die base; 101, punching die; 102, positioning die; 103, hole repairing die; 104, sheet punching die; 20, upper die base; 201, punching punch; 202, positioning punch; 203, hole repairing punch; 204, sheet punch; 30, pin. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary and should not be construed as limiting the protection scope of the present invention.

[0025] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0026] This embodiment mainly describes the title of the chain plate stamping die, which is as follows:

[0027] Main program:

[0028] The chain plate stamping die comprises a lower die base 10 and an upper die base 20. The upper die base 20 is provided with a punching structure and a sheet structure. The sheet structure comprises a sheet punch 204 arranged on the upper die base 20 and a sheet die 104 arranged on the lower die base 10. The sheet punch 204 is provided with two pins 30. When the sheet punch 204 is punching, the two pins 30 extend into two axial holes on the chain plate after the holes are repaired, and the diameter of the pins 30 is the same as the diameter of the standard axial hole. In this scheme, two pins 30 are arranged on the sheet punch, and when the sheet is stamped, the pins 30 extend into the axial hole to support the axial hole, which effectively avoids the shrinkage of the axial hole when stamping the sheet.

[0029] Preferably, two cylindrical holes are provided on the punching die 204, and the pins 30 are installed in the cylindrical holes, and the pins 30 are interference fit with the cylindrical hole walls. The structure can be installed by pressing in, and preferably, a pin hole can be provided on the back to knock out the pins 30.

[0030] Punching part:

[0031] Preferably, the punching structure includes a punching die set, a positioning hole set and a hole repairing die set which are sequentially arranged on the lower die base 10, the punching die set includes two punching dies 101, the positioning hole set includes two positioning dies 102, the hole repairing die set includes two hole repairing dies 103, and the upper die base 20 is provided with a punch die set that cooperates with the above-mentioned dies, the aperture of the punching die 101 is smaller than the aperture of the chain sheet shaft hole, and the aperture of the hole repairing die 103 is the same as the aperture of the chain sheet shaft hole. The punches include a punching punch 201, a positioning punch 202 and a hole repairing punch 203.

[0032] Preferably, the punching die 101 is a cylindrical through hole or groove.

[0033] Preferably, the positioning die 102 is a cylindrical through hole or groove.

[0034] Preferably, the hole repairing die 103 is a cylindrical through hole or groove.

[0035] Preferably, the blanking die is a through hole whose shape matches the shape of the chain sheet.

[0036] Preferably, the end of the pin 30 exceeds the end surface of the punching punch 204 and the length of the exceeding portion is greater than or equal to the length of the chain plate shaft hole.

[0037] Preferably, the upper die base 20 and the lower die base 10 are provided with a plurality of groups of punching structures and punching sheet structures.

[0038] Preferably, a guide column is provided on the lower die base 10, a guide sleeve is slidably provided on the guide column, a buffer spring is provided on the guide column and the top end of the buffer spring abuts against the bottom end of the guide sleeve, and the upper die base 20 is fixed on the guide sleeve.

[0039] The above is a detailed introduction to the titles provided by the utility model. Specific examples are used in this article to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A chain plate stamping die, comprising a lower die base and an upper die base, wherein the upper die base is provided with a punching structure and a punching sheet structure, wherein the punching sheet structure comprises a punching sheet convex die arranged on the upper die base and a punching sheet concave die arranged on the lower die base, and wherein the characteristics are: Two pins are arranged on the punching punch. When the punching punch is used to punch, the two pins extend into two axial holes on the chain sheet after being repaired, and the diameter of the pins is the same as the diameter of the standard axial holes.

2. The chain plate stamping die according to claim 1, characterized in that: The punching structure includes a punching die group, a positioning hole group and a hole repairing die group which are sequentially arranged on the lower die base. The punching die group includes two punching dies, the positioning hole group includes two positioning dies, the hole repairing die group includes two hole repairing dies, and the upper die base is provided with a punch die group which cooperates with the above-mentioned dies. The aperture of the punching die is smaller than the aperture of the chain sheet shaft hole, and the aperture of the hole repairing die is the same as the aperture of the chain sheet shaft hole.

3. The chain plate stamping die according to claim 2, characterized in that: The punching die is a cylindrical through hole or groove.

4. The chain plate stamping die according to claim 2, characterized in that: The positioning die is a cylindrical through hole or groove.

5. The chain plate stamping die according to claim 2, characterized in that: The hole repairing die is a cylindrical through hole or groove.

6. The chain plate stamping die according to claim 2, characterized in that: The blanking die is a through hole whose shape matches the shape of the chain sheet.

7. The chain plate stamping die according to claim 1, characterized in that: Two cylindrical holes are arranged on the punch die, and pins are installed in the cylindrical holes, and the pins are interference fit with the walls of the cylindrical holes.

8. The chain plate stamping die according to claim 1, characterized in that: The end of the pin shaft exceeds the end face of the punching die, and the length of the exceeding part is greater than or equal to the length of the chain plate shaft hole.

9. The chain plate stamping die according to claim 1, characterized in that: The upper die base and the lower die base are provided with a plurality of groups of punching structures and punching sheet structures.

10. The chain plate stamping die according to claim 1, characterized in that: A guide column is arranged on the lower die seat, a guide sleeve is slidably arranged on the guide column, a buffer spring is arranged on the upper sleeve of the guide column, and the top end of the buffer spring abuts against the bottom end of the guide sleeve, and the upper die seat is fixed on the guide sleeve.

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