Punching structure for small hole forming

Abstract

The utility model discloses a punching structure for small hole forming, which comprises an upper template and a lower template which are oppositely arranged, a workpiece is punched and formed between the upper template and the lower template, and the punching structure for small hole forming comprises a front processing station, a middle processing station and a final processing station which are continuously arranged, the pre-machining station comprises a chamfering punch arranged on an upper die plate and a chamfering insert arranged on a lower die plate. The chamfering punch is used for punching a workpiece and forming a pre-chamfering groove. The middle machining station comprises a hole upsetting punch arranged on the upper die plate and a hole upsetting pressing block arranged on the lower die plate. The middle machining station is used for conducting downward extrusion on the pre-chamfering groove and forming a flange. The final machining station comprises a punching punch arranged on the upper die plate and a punching bush arranged on the lower die plate, and the final machining station is used for punching the workpiece in a penetrating flange mode. The utility model can satisfy the shape characteristics of the flange hole and prolong the service life of the die, and is convenient for realizing batch production.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a small hole forming stamping structure. Background Art

[0002] With the improvement of environmental awareness, the development of new energy vehicles has been rapid. In terms of transportation, new energy electric vehicles are gaining more and more attention and favor. The electric drive and electronic control bearing pressure plate is used to fix electronic components, such as Figure 1 As shown, it has three ears, and the ears are raised flange structures, and screw holes are formed at the ear positions, and are fixed by three screw hole locking points. Therefore, its strength and precision have certain requirements. Today's products pursue lightweight vehicles, so the workpieces are also designed with small apertures / small appearances. The bottom hole area of ​​the stamping part is also thickened so that the aperture and thickness reach 1:1, and the force on the punch becomes larger. The conventional punching method has a drastic impact on the life of the mold, and the product is not easy to form, which is insufficient. Utility Model Content

[0003] The utility model aims to avoid the shortcomings of the prior art and provides a punching structure for small hole forming which can prolong the service life of a mold and improve the forming quality of a product.

[0004] The utility model solves the technical problem by adopting the following technical scheme: a punching structure for forming a small hole, comprising an upper template and a lower template arranged relatively, a workpiece is punched and formed between the upper template and the lower template, the punching structure for forming the small hole comprises a front processing station, an intermediate processing station and a final processing station arranged continuously, the front processing station comprises a chamfering punch arranged on the upper template and a chamfering block arranged on the lower template, the position of the chamfering punch corresponds to the position of the chamfering block, the chamfering punch is used to punch on the workpiece and form a pre-chamfered groove;

[0005] The intermediate processing station includes an upsetting punch disposed on the upper template and an upsetting block disposed on the lower template, the position of the upsetting punch corresponds to the position of the upsetting block, and the intermediate processing station is used to perform downward extrusion on the pre-chamfered groove and form a flange;

[0006] The final processing station includes a punching punch arranged on the upper template and a punching bushing arranged on the lower template. The position of the punching punch corresponds to the position of the punching bushing. The final processing station is used to punch holes through the flange of the workpiece.

[0007] In several embodiments, the front end angle of the chamfering punch is a right angle.

[0008] In several embodiments, a first opening is provided on the lower template, the chamfering block is provided in the first opening, and a first chamfering groove is formed between the upper end of the first opening and the chamfering block.

[0009] In several embodiments, a second opening is provided on the lower template, the upset block is provided in the second opening, an extrusion groove is formed between the upper end of the second opening and the upset block, and the flange is formed in the extrusion groove.

[0010] In several embodiments, a guide block is protruding from the upper end of the upsetting block, and the side surface of the guide block is inclined.

[0011] In several embodiments, a third opening is provided on the lower template, the punching bushing is disposed in the third opening, a chip removal hole is provided in the punching bushing, and the chip removal hole is for the punching punch to penetrate.

[0012] In several embodiments, a punching groove is formed between the upper end of the third opening and the punching bushing.

[0013] The beneficial effects of the utility model are:

[0014] The utility model can avoid the fracture caused by the lateral force generated during flange forming and the stress during shunt forming through the three-stage processing structure, can meet the shape characteristics of the flange hole and have a good mold life, and is easy to realize mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are for illustrative purposes only of selected embodiments and do not represent all possible implementations, and should not be considered to limit the scope of the present invention.

[0016] Figure 1 The structure of the existing bearing pressure plate is schematically shown;

[0017] Figure 2 The structure of the punching structure for forming small holes in this embodiment is schematically shown;

[0018] Figure 3 Schematically shows Figure 1 The structure at the middle upper template;

[0019] Figure 4 Schematically shows Figure 1 The processing structure of the workpiece. DETAILED DESCRIPTION

[0020] Below, embodiments of the present invention are described in detail with reference to the accompanying drawings. To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in conjunction with the accompanying drawings is not intended to limit the scope of the present invention for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0022] The punching structure of the small hole forming in this embodiment is mainly used for the workpiece 100, such as Figure 1 The bearing pressure plate shown in the figure is punched.

[0023] like Figure 2-Figure 4 As shown, specifically, the punching structure for forming the small hole includes an upper template 10 and a lower template 20 that are relatively arranged. The workpiece 100 is punched and formed between the upper template 10 and the lower template 20. It mainly includes a continuous die structure of a continuously arranged front processing station, an intermediate processing station and a final processing station. The workpiece 100 completes the punching process after passing through the front processing station, the intermediate processing station and the final processing station in sequence.

[0024] Among them, the front processing station includes a chamfering punch 31 arranged on the upper template 10 and a chamfering block 32 arranged on the lower template 20. The position of the chamfering punch 31 corresponds to the position of the chamfering block 32. The chamfering punch 31 is used to punch on the workpiece and form a pre-chamfered groove 101, and the front end angle of the chamfering punch 31 is a right angle. At the same time, a first opening 21 is provided on the lower template 20. The chamfering block 32 is arranged in the first opening 21. A first chamfered groove is formed between the upper end of the first opening 21 and the chamfering block 32. The pre-chamfered groove 101 formed by punching the front end of the chamfering punch 31 does not penetrate the workpiece 100. The first chamfered groove realizes the flow extension of the corresponding lower end position of the workpiece 100 when the pre-chamfered groove 101 is formed.

[0025] In addition, the intermediate processing station includes an upsetting punch 41 arranged on the upper template 10 and an upsetting block 42 arranged on the lower template 20. The position of the upsetting punch 41 corresponds to the position of the upsetting block 42. The intermediate processing station is used to perform downward extrusion on the pre-chamfered groove 101 and form a flange 102. The flange 102 is an annular protruding structure. A second opening 22 is provided on the lower template 20. The upsetting block 42 is provided in the second opening 22. An extrusion groove 201 is formed between the upper end of the second opening 22 and the upsetting block 42. The flange 102 is formed in the extrusion groove 201. In addition, a guide block 421 is protruding from the upper end of the upsetting block 42, and the side of the guide block 421 is inclined.

[0026] That is, the upper template 10 drives the upsetting punch 41 to press down, and cooperates with the upsetting block 42, so that the material at the corresponding position on the workpiece 100 flows to fill the extrusion groove 201, thereby forming the flange 102 structure.

[0027] In addition, the final processing station includes a punching punch 51 arranged on the upper template 10 and a punching bushing 52 arranged on the lower template 20. The position of the punching punch 51 corresponds to the position of the punching bushing 52. The final processing station is used to punch the workpiece through the flange 102. A third opening 23 is arranged on the lower template 20. The punching bushing 52 is arranged in the third opening 23. A chip removal hole 521 is arranged in the punching bushing 52. The chip removal hole 521 is for the punching punch 51 to penetrate, and a punching groove 53 is formed between the upper end of the third opening 23 and the punching bushing 52.

[0028] By pressing down the punching punch 51 and cooperating with the punching bushing 52, the portion formed in the intermediate processing station is punched to realize the forming of the flange hole.

[0029] All the methods described herein can be performed in any suitable order. Any and all examples used, or exemplary language provided herein (such as "for example") are merely to better illustrate the present invention, and are not intended to limit the scope of the present invention, unless the claims are included. The language in the detailed description should not be understood as indicating any essential factors for practicing the present invention that are not claimed.

[0030] The present invention describes preferred embodiments, including the best way to carry out the present invention known to the inventor. Of course, variations of these preferred embodiments will be apparent to those skilled in the art. The inventors anticipate that skilled artisans may use such variations as appropriate, and the inventors point out that the present invention may be implemented in other ways than those specifically described herein. Therefore, the present invention includes all improvements included in the spirit and scope of the present invention as defined by the claims. Moreover, unless otherwise stated or clearly contradictory in content, the present invention includes any of the above factors and all possible variations thereof.

Claims

1. A punching structure for forming a small hole, comprising an upper template (10) and a lower template (20) arranged opposite to each other, wherein a workpiece (100) is punched and formed between the upper template (10) and the lower template (20), characterized in that: The punching structure for forming a small hole comprises a front processing station, an intermediate processing station and a final processing station which are arranged in series, the front processing station comprises a chamfering punch (31) arranged on an upper template (10) and a chamfering block (32) arranged on a lower template (20), the position of the chamfering punch (31) corresponds to the position of the chamfering block (32), and the chamfering punch (31) is used to punch on a workpiece and form a pre-chamfered groove (101); The intermediate processing station comprises an upsetting punch (41) arranged on the upper template (10) and an upsetting block (42) arranged on the lower template (20), the position of the upsetting punch (41) corresponds to the position of the upsetting block (42), and the intermediate processing station is used to perform downward extrusion on the pre-chamfered groove (101) to form a flange (102); The final processing station comprises a punching punch (51) arranged on an upper template (10) and a punching bushing (52) arranged on a lower template (20), wherein the position of the punching punch (51) corresponds to the position of the punching bushing (52), and the final processing station is used to punch holes through the flange (102) on the workpiece.

2. A punching structure for forming a small hole according to claim 1, characterized in that: The front end angle of the chamfering punch (31) is a right angle.

3. A punching structure for forming a small hole according to claim 2, characterized in that: The lower template (20) is provided with a first opening (21), the chamfering block (32) is arranged in the first opening (21), and a first chamfering groove is formed between the upper end of the first opening (21) and the chamfering block (32).

4. A punching structure for forming a small hole according to claim 1, characterized in that: The lower template (20) is provided with a second opening (22), the upset pressing block (42) is arranged in the second opening (22), an extrusion groove (201) is formed between the upper end of the second opening (22) and the upset pressing block (42), and the flange (102) is formed in the extrusion groove (201).

5. A punching structure for forming a small hole according to claim 4, characterized in that: A guide block (421) is protruding from the upper end of the upsetting hole pressing block (42), and the side surface of the guide block (421) is inclined.

6. A punching structure for forming a small hole according to claim 1, characterized in that: The lower template (20) is provided with a third opening (23), the punching bushing (52) is arranged in the third opening (23), and a chip removal hole (521) is provided in the punching bushing (52), and the chip removal hole (521) is for the punching punch (51) to penetrate.

7. A punching structure for forming a small hole according to claim 6, characterized in that: A punching groove (53) is formed between the upper end of the third opening (23) and the punching bushing (52).

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