Punching die for punching from bottom to top

Abstract

The punching die comprises an upper die assembly and a lower die assembly, the lower die assembly comprises a lower die block, a plurality of punching columns and a base, a plurality of first springs are arranged between the lower die block and the base, the punching columns extend from the lower die block to the upper die assembly, and the first springs are arranged between the punching columns and the base. The storage cavity face of the safety air bag box body is buckled with and abuts against the lower die block, the upper die assembly moves downwards and presses the safety air bag box body to complete punching, punching is conducted from bottom to top, punching burrs extend from the storage cavity face of the safety air bag box body to the non-storage cavity face, and the punching burrs are removed from the storage cavity face of the safety air bag box body to the non-storage cavity face of the safety air bag box body. The contact between punching burrs and the safety air bag is avoided, the punching burrs do not need to be polished, and the production cost of the safety air bag box body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of production molds for airbag boxes, and particularly relates to a punching die for punching upward from bottom to top. Background Art

[0002] An airbag is a passive safety protection system. When used in conjunction with a seat belt, it can provide effective anti-collision protection for the occupants. When a vehicle collides, the airbag in the vehicle can reduce the head injury rate by 25% and the facial injury rate by about 80%. An airbag box is a carrier for holding an airbag. For example, Chinese patent document CN212148750U discloses a press riveting and assembling type airbag box.

[0003] The processing steps of the airbag box are as follows: First, a storage cavity for accommodating the airbag is formed by stamping; then, the airbag box is punched. These holes can be used to connect the airbag box with other components. However, traditional stamping dies all adopt a stamping method from top to bottom, which will cause burrs generated by punching on the storage cavity surface of the airbag box. These burrs need to be polished manually to prevent the burrs from cutting the airbag. Therefore, it increases the labor cost and product processing time, increases the production cost of the airbag box, and is not conducive to market competition. Summary of the Utility Model

[0004] Aiming at the deficiencies in the prior art, the purpose of the utility model is to propose a punching die for punching upward from bottom to top to solve the problems mentioned in the above background art section.

[0005] The utility model is realized through the following technical solutions:

[0006] A punching die for punching upward from bottom to top includes an upper die assembly and a lower die assembly. The lower die assembly includes a lower die block, several punching columns and a base. Several first springs are arranged between the lower die block and the base. The punching columns extend from the lower die block towards the upper die assembly. The storage cavity surface of the airbag box is buckled and abutted against the lower die block. The upper die assembly moves downward and presses the airbag box to complete punching.

[0007] Further, the lower die assembly further includes several fine-tuning insert groups embedded in the periphery of the lower die block. Several second springs are arranged between the fine-tuning insert groups and the base. Through the second springs, the fine-tuning insert groups can be telescoped along the vertical direction of the lower die block. The fine-tuning insert groups are provided with a guiding part that is narrow at the top and wide at the bottom.

[0008] Further, the fine-tuning insert groups include several first insert groups symmetrically arranged on the front and rear end faces of the lower die block along the center of the lower die block.

[0009] Further, the lower die assembly further includes a guiding insert block centrally disposed on the left end face of the lower die block. The guiding insert block is provided with a guiding inclined surface for guiding the airbag box body to be embedded in the lower die block.

[0010] Further, the fine-tuning insert block group further includes two second insert blocks symmetrically arranged along the center of the lower die block on its right end face.

[0011] Further, the first insert block group includes two first insert blocks and a connecting shaft connecting the two first insert blocks. The lower die block is provided with a limiting groove for the connecting shaft to pass through.

[0012] Further, the guiding portion includes an upper arc surface and a side inclined surface. When the airbag box body is not buckled to the lower die block, the upper arc surface and the side inclined surface are respectively flush with the outer peripheral surface of the lower die block.

[0013] Further, the upper die assembly includes an upper layer plate, a partition plate, an upper die plate, a limiting pressure block and a punching insert block. The partition plate is provided with a plurality of notches. The limiting pressure block penetrates into the upper layer plate from bottom to top, and the limiting pressure block is provided with a limiting surface abutting against the side wall of the notch. The punching insert block is embedded in the upper die plate, and the punching insert block is disposed below the notch.

[0014] Further, the lower die assembly further includes a limiting pin penetrating through the punching column, and the punching column is fixed in the base through the limiting pin.

[0015] The beneficial effect of the present utility model is as follows: A punching die for punching upward from below includes an upper die assembly and a lower die assembly. The lower die assembly includes a lower die block, a plurality of punching columns and a base. A plurality of first springs are arranged between the lower die block and the base. The punching columns extend from the lower die block towards the upper die assembly. The placing cavity surface of the airbag box body is buckled and abuts against the lower die block. The upper die assembly moves downward and presses the airbag box body to complete punching. Since the punching direction is upward from below, the punching burrs extend from the placing cavity surface of the airbag box body towards the non-placing cavity surface, avoiding the contact between the punching burrs and the airbag. The punching burrs do not need to be polished, reducing the production cost of the airbag box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the present utility model.

[0017] Figure 2 is a central sectional view of the present utility model along the left-right direction.

[0018] Figure 3 is an exploded view of the present utility model.

[0019] Figure 4This is the state diagram of the position change of the fine-tuning insert group of the present utility model.

[0020] Figure 5 This is the central sectional view of the present utility model along the front-back direction.

[0021] Figure 6 This is the exploded view of the upper die assembly of the present utility model.

[0022] Figure 7 This is another exploded view of the upper die assembly of the present utility model.

[0023] Figure 8 This is the three-dimensional view of the airbag box body of the present utility model.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 1. Upper die assembly; 11. Upper layer plate; 12. Partition plate; 121. Notch; 13. Upper template; 14. Limit pressing block; 15. Punching insert; 16. Pin shaft; 2. Lower die assembly; 21. Lower die block; 211. Limit groove; 22. Punching column; 221. Limit pin; 23. Base; 231. Upper bottom plate; 2311. Card slot; 232. Lower bottom plate; 24. First spring; 25. Fine-tuning insert group; 251. Second spring; 252. First insert group; 2521. First insert; 2522. Connecting shaft; 253. Second insert; 26. Guide insert; 261. Guide inclined surface; 3. Airbag box body; 31. Object placement cavity surface. Specific embodiments

[0026] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. It should be noted here that the descriptions of these embodiments are used to help understand the present utility model, but do not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Referring to Figures 1 to 8 As shown, a punching die for punching from bottom to top includes an upper die assembly 1 and a lower die assembly 2. The lower die assembly 2 includes a lower die block 21, a plurality of punching columns 22 and a base 23. A plurality of first springs 24 are arranged between the lower die block 21 and the base 23. The punching columns 22 extend from the lower die block 21 towards the upper die assembly 1. The object placement cavity surface 31 of the airbag box body 3 is buckled and abutted against the lower die block 21. The upper die assembly 1 can be driven by a cylinder or other mechanisms to move downward and press the airbag box body 3 to complete punching.

[0028] The airbag box body 3 is buckled to the lower module 21, and the storage cavity surface 31 abuts against the lower module 21. Then, the punching direction is from bottom to top. Therefore, the punching burrs extend from the storage cavity surface 31 of the airbag box body 3 towards the non-storage cavity surface 31, avoiding the contact between the punching burrs and the airbag. The punching burrs do not need to be polished, reducing the production cost of the airbag box body 3.

[0029] Since there will be dimensional deviations in the airbag box body 3 during the stamping process, these errors will not affect the normal use of the airbag box body 3. However, during the punching process of the airbag box body 3, the existing integrated lower module 21 cannot accurately cooperate with the airbag box body 3 with the above-mentioned dimensional deviations, easily causing the airbag box body 3 to shake relative to the lower module 21 during the punching process, resulting in situations such as tearing of the punching hole shape. Therefore, in order to enable airbag box bodies 3 of various sizes to fit with the lower module 21, the present utility model designs the following structure: Specifically, the lower die assembly 2 further includes a plurality of fine-tuning insert groups 25 embedded in the peripheral edge of the lower module 21. A plurality of second springs 251 are arranged between the fine-tuning insert groups 25 and the base 23, enabling the fine-tuning insert groups 25 to perform telescopic movement along the vertical direction of the lower module 21 through the second springs 251. The fine-tuning insert groups 25 are provided with a guiding portion that is narrower at the top and wider at the bottom. When the airbag box body 3 is buckled into the lower module 21, and then the upper die assembly 1 presses down to drive the lower module 21 to abut against the base 23 to complete punching. If there are dimensional deviations in the airbag box body 3, the fine-tuning insert groups 25 move downward relative to the lower module 21, and the guiding portion abuts against the storage surface of the airbag box body 3, thereby preventing the airbag box body 3 from shaking relative to the lower module 21 during the punching process and ensuring the integrity of the punching hole shape.

[0030] The fine-tuning insert groups 25 include a plurality of first insert groups 252 symmetrically arranged along the center of the lower module 21 on its front and rear end faces. The number of the first insert groups 252 is two, and they are spaced apart on the front and rear end faces at the left and right ends of the lower module 21, enabling the first insert groups 252 to more stably abut against the airbag box body 3.

[0031] Among them, each first insert group 252 includes two first inserts 2521 respectively arranged on the front and rear end faces of the lower module 21, and a connecting shaft 2522 connecting the two first inserts 2521. The lower module 21 is provided with a limiting groove 211 for the connecting shaft 2522 to pass through, restricting the maximum and minimum strokes of the first insert 2521 through the limiting groove 211. Refer to Figure 4 The upper part is the undulation of the first insert 2521 to the maximum stroke, refer to Figure 4 The lower part is the contraction of the first insert 2521 to the minimum stroke. The two first inserts 2521 move in unison through the connecting shaft 2522.

[0032] The lower die assembly 2 further includes a guiding insert block 26 centrally disposed on the left end face of the lower die block 21. The guiding insert block 26 is provided with a guiding inclined surface 261 for guiding the airbag box body 3 to be embedded into the lower die block 21. The fine-tuning insert block group 25 further includes a second insert block 253 symmetrically arranged along the center of the lower die block 21 on its right end face. The guiding insert block 26 and the second insert block 253 are respectively arranged on the left and right sides of the lower die block 21, and there is no limitation on their left-right relationship. When the airbag box body 3 is buckled into the lower die block 21, the airbag box body 3 is offset to the right by the guiding insert block 26 on the left, and then the airbag box body 3 is supported by the second insert block 253 located on the right, so as to further prevent the airbag box body 3 from shaking relative to the lower die block 21 during the punching process and ensure the integrity of the punching hole shape.

[0033] The lower die assembly 2 further includes a limit pin 221 passing through the punching post 22, and the punching post 22 is fixed in the base 23 through the limit pin 221. Specifically, referring to Figure 5 as shown, the base 23 includes an upper base plate 231 and a lower base plate 232 fixedly connected to each other. The upper base plate 231 is provided with a card slot 2311, and the limit pin 221 is embedded in the card slot 2311.

[0034] The upper die assembly 1 includes an upper layer plate 11, a partition plate 12, an upper template 13, a limit pressing block 14, and a punching insert block 15. The partition plate 12 is provided with a plurality of notches 121. The limit pressing block 14 penetrates the upper layer plate 11 from bottom to top, and the limit pressing block 14 is provided with a limit surface abutting against the side wall of the notch 121. The punching insert block 15 is embedded in the upper template 13 and is arranged below the notch 121. The upper layer plate 11, the partition plate 12, and the upper template 13 are connected in alignment and fastened through a plurality of pin shafts 16. The simple assembly of the upper die assembly 1 is realized through the above structure. During punching, the lower die block 21 moves downward until it abuts against the base 23, and then the punching post 22 protrudes from the lower die block 21 and is embedded in the punching insert block 15, thereby completing the punching.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0037] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A punching die for punching from bottom to top, characterized in that: The invention comprises an upper die assembly (1) and a lower die assembly (2), wherein the lower die assembly (2) comprises a lower die block (21), a plurality of punching columns (22) and a base (23), a plurality of first springs (24) are arranged between the lower die block (21) and the base (23), the punching columns (22) extend from the lower die block (21) toward the upper die assembly (1), the storage cavity surface (31) of the airbag box body (3) is engaged with and abuts against the lower die block (21), and the upper die assembly (1) moves downward and presses the airbag box body (3) to complete punching.

2. A punching die for punching from bottom to top according to claim 1, characterized in that: The lower mold assembly (2) also includes a plurality of fine-tuning insert groups (25) embedded in the periphery of the lower mold block (21); a plurality of second springs (251) are arranged between the fine-tuning insert group (25) and the base (23); the fine-tuning insert group (25) can be extended and retracted in the vertical direction of the lower mold block (21) through the second springs (251); and the fine-tuning insert group (25) is provided with a guide portion which is narrow at the top and wide at the bottom.

3. A punching die for punching from bottom to top according to claim 2, characterized in that: The fine-tuning insert group (25) comprises a plurality of first insert groups (252) symmetrically arranged along the center of the lower module (21) on the front and rear side end surfaces thereof.

4. A punching die for punching from bottom to top according to claim 3, characterized in that: The lower mold assembly (2) further comprises a guide insert (26) centrally arranged on the left end surface of the lower mold block (21), the guide insert (26) being provided with a guide slope (261) for guiding the airbag box body (3) to be embedded in the lower mold block (21).

5. A punching die for punching from bottom to top according to claim 4, characterized in that: The fine-tuning insert set (25) also includes two second inserts (253) arranged symmetrically along the center of the lower module (21) on the right end surface thereof.

6. A punching die for punching from bottom to top according to claim 3, characterized in that: The first insert group (252) comprises two first inserts (2521) and a connecting shaft (2522) connecting the two first inserts (2521), and the lower module (21) is provided with a limiting groove (211) for the connecting shaft (2522) to pass through.

7. A punching die for punching from bottom to top according to claim 2, characterized in that: The guide portion comprises an upper curved surface and a side inclined surface. When the airbag box body (3) is not engaged with the lower module (21), the upper curved surface and the side inclined surface are respectively flush with the outer peripheral surface of the lower module (21).

8. A punching die for punching from bottom to top according to any one of claims 1 to 7, characterized in that: The upper mold assembly (1) comprises an upper plate (11), a partition (12), an upper mold plate (13), a limiting pressure block (14) and a punching insert (15); the partition (12) is provided with a plurality of notches (121); the limiting pressure block (14) penetrates into the upper plate (11) from bottom to top, and the limiting pressure block (14) is provided with a limiting surface abutting against the side wall of the notch (121); the punching insert (15) is embedded in the upper mold plate (13), and the punching insert (15) is arranged below the notch (121).

9. A punching die for punching from bottom to top according to any one of claims 1 to 7, characterized in that: The lower die assembly (2) further comprises a limit pin (221) that crosses the punching column (22), and the punching column (22) is fixed in the base (23) by the limit pin (221).

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