Multi-station negative angle forming tooling

Abstract

The application discloses a multi-step negative-angle forming tool, which comprises an upper die base (1) and a lower die base (2), the bottom of the upper die base (1) is provided with an upper insert block, the two sides of the upper insert block are provided with bending upper insert blocks (3), the top of the lower die base (2) is provided with a lower insert block (16), and the two sides of the lower insert block (16) are provided with two bending lower insert blocks (4). The application can integrate two-step bending and negative-angle bending on the same tool, and can realize automatic production through one-time forming.

Description

TECHNICAL FIELD

[0001] The present application relates to a forming tool, in particular a multi-step negative angle forming tool. BACKGROUND

[0002] The multi-step negative angle forming process is widely used in the automotive and military fields, especially in the military field, the bending precision of parts is becoming higher and higher. For the multi-step negative angle forming process of parts, the traditional scheme is to bend the middle region in two sequences, and then use negative angle bending forming process to process negative angle, which has many process contents, and the multi-step forming tool reference has tolerance accumulation, the part precision is poor, the labor intensity is large, and the automatic design cannot be completed, the production efficiency is low. SUMMARY

[0003] The purpose of the present application is to provide a multi-step negative angle forming tool to solve the technical problems in the prior art, which can integrate two sequence bending and negative angle bending on the same tool, once forming in place, realizing automatic production.

[0004] The present application provides a multi-step negative angle forming tool, comprising an upper die seat and a lower die seat, the bottom of the upper die seat is provided with an upper insert block, the two sides of the upper insert block are provided with bending upper insert blocks, the top of the lower die seat is provided with a lower insert block, and the two sides of the lower insert block are provided with two bending lower insert blocks.

[0005] In the foregoing multi-step negative angle forming tool, preferably, the upper insert block comprises a middle bending upper insert block and a side bending upper insert block, the number of the middle bending upper insert block is one, the number of the side bending upper insert block is two, and the two side bending upper insert blocks are located on the two sides of the middle bending upper insert block.

[0006] In the foregoing multi-step negative angle forming tool, preferably, an upper insert block mounting groove is formed on the bottom surface of the upper die seat, the middle bending upper insert block and the side bending upper insert block are mounted in the upper insert block mounting groove, the middle bending upper insert block is connected with the groove bottom of the upper insert block mounting groove through a middle bending spring, and the side bending upper insert block is connected with the groove bottom of the upper insert block mounting groove through a side bending spring.

[0007] In the foregoing multi-step negative angle forming tool, preferably, a limiting boss is formed on the outer side wall of the two side bending upper insert blocks, the bending upper insert block is mounted on the side bending upper insert block through a first connecting rod, the top surface of the bending upper insert block is connected with the limiting boss through a bending spring, and an acute angle bending part is formed on the bending upper insert block.

[0008] Preferably, a lower insert mounting groove is formed in the top of the lower die seat, and a bending insert support is fixed at each end in the lower insert mounting groove, and the lower insert is located between the two bending insert supports, and a plurality of curved lower insert springs are arranged on the bottom of the lower insert.

[0009] Preferably, a semicircular groove is formed in the top surface of the bending insert support, the bending lower insert is in a cylindrical structure, the bending lower insert is rotatably installed in the semicircular groove, and the two ends of the bending lower insert are connected with the bending insert support through a second connecting rod, and a bending groove is formed in the bending lower insert and matched with the acute angle bending part.

[0010] Compared with the prior art, the present application comprises an upper die seat and a lower die seat, the bottom of the upper die seat is provided with an upper insert, the two sides of the upper insert are provided with bending upper inserts, the top of the lower die seat is provided with a lower insert, and the two sides of the lower insert are provided with two bending lower inserts. The bending upper inserts and the bending lower inserts are arranged to bend the two ends of the part at a negative angle, and the two bending and negative angle bending processes are integrated on the same tooling, the part is formed in place at one time, and automatic production is realized, thereby reducing the processing cost and improving the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the isometric view of the present application;

[0012] Figure 2 is the front view of the present application;

[0013] Figure 3 is the half-sectional view of Figure 2 ; is the half-sectional view of

[0014] Figure 4 is the structure schematic view in the clamped state.

[0015] BRIEF DESCRIPTION OF DRAWINGS The upper die seat 1, the lower die seat 2, the bending upper insert 3, the bending lower insert 4, the intermediate bending upper insert 5, the side edge bending upper insert 6, the upper insert mounting groove 7, the intermediate bending spring 8, the side edge bending spring 9, the limiting boss 10, the first connecting rod 11, the bending spring 12, the acute angle bending part 13, the lower insert mounting groove 14, the bending insert support 15, the lower insert 16, the curved lower insert spring 17, the semicircular groove 18, the second connecting rod 19, the bending groove 20, and the plate 21. DETAILED DESCRIPTION

[0016] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are for the purpose of explanation only, and are not to be construed as limitations of the present application.

[0017] Embodiments of the present application: as shown in Figures 1-4 A multi-step negative angle forming tool, comprising an upper die seat 1 and a lower die seat 2, the upper die seat 1 is located directly above the lower die seat 2, the bottom of the upper die seat 1 is provided with an upper insert block, the two sides of the upper insert block are provided with bending upper insert blocks 3, the top of the lower die seat 2 is provided with a lower insert block 16, and the two sides of the lower insert block 16 are provided with two bending lower insert blocks 4.

[0018] The upper die seat 1 and the lower die seat 2 are closed, and the two bending of the plate 21 is completed through the cooperation of the upper insert block and the lower insert block 16. The two ends of the plate 21 are bent at a negative angle through the cooperation of the two bending upper insert blocks 3 and the two bending lower insert blocks 4, and the processing of the two negative angles is realized.

[0019] Specifically, the bottom of the upper insert block has a first protruding part and two first recessed parts, and the top of the lower insert block 16 has two second protruding parts and a second recessed part. When stamping the plate 21, the first protruding part cooperates with the second recessed part, and the first recessed part cooperates with the second protruding part, so as to stamp two curved structures on the plate 21. In order to ensure the success rate of part processing, the structure of the upper insert block is specially designed in this embodiment. The upper insert block comprises a middle bending upper insert block 5 and side bending upper insert blocks 6. The number of the middle bending upper insert block 5 is one, and the number of the side bending upper insert blocks 6 is two. The two side bending upper insert blocks 6 are located on both sides of the middle bending upper insert block 5.

[0020] The first protruding part is arranged at the bottom of the middle bending upper insert block 5, and the two first recessed parts are composed of the arc surfaces of the bottoms of the middle bending upper insert block 5 and the side bending upper insert blocks 6. The upper insert block is designed as a split structure, so that the first protruding part can first contact the plate 21, realizing the pre-positioning of the plate 21, preventing the position of the plate 21 from deviating, and thus ensuring the stamping quality.

[0021] Further, the bottom surface of the upper die seat 1 is provided with an upper insert block mounting groove 7, the upper ends of the middle bending upper insert block 5 and the side bending upper insert blocks 6 are mounted in the upper insert block mounting groove 7, the middle bending upper insert block 5 is connected with the groove bottom of the upper insert block mounting groove 7 through a middle bending spring 8, and the side bending upper insert blocks 6 are connected with the groove bottom of the upper insert block mounting groove 7 through side bending springs 9.

[0022] In order to ensure that the first protruding part is first contacted with the plate 21, the length of the middle bending spring 8 is slightly longer than the length of the side bending spring 9, so that in the unclamped state, the lowest position of the middle bending upper insert 5 is lower than the lowest position of the side bending upper insert 6, so that when the upper die holder 1 is lowered, it is ensured that the first protruding part is first contacted with the plate 21.

[0023] Further, the outer side wall of the two side bending upper inserts 6 is formed with a limiting boss 10, the bending upper insert 3 is installed on the side bending upper insert 6 through a first connecting rod 11, the top surface of the bending upper insert 3 is connected with the limiting boss 10 through a bending spring 12, and the bending upper insert 3 is formed with an acute angle bending part 13.

[0024] One end of the first connecting rod 11 is connected with the side bending upper insert 6 through a rotating shaft, the other end of the first connecting rod 11 is connected with the bending upper insert 3 through a rotating shaft, and under the cooperation of the bending spring 12 and the first connecting rod 11, the distance between the two bending upper inserts 3 is close in the upper and lower mold separation state, the bottom surface of the bending upper insert 3 is lower than the bottom surface of the side bending upper insert 6, when the upper and lower molds are clamped, the top of the bending upper insert 3 abuts against the limiting boss 10, and the bottom surface of the bending upper insert 3 is flush with the bottom surface of the side bending upper insert 6. The structure design can facilitate the demolding of the molded part and solve the problem of difficult demolding of the negative angle part.

[0025] Further, the top of the lower die holder 2 is provided with a lower insert mounting groove 14, two bending insert supports 15 are fixedly arranged at the two ends in the lower insert mounting groove 14 respectively, the lower insert 16 is located between the two bending insert supports 15, the bottom of the lower insert 16 is provided with a plurality of bending lower insert springs 17, and the lower ends of the bending lower insert springs 17 are fixedly connected with the groove bottom of the lower insert mounting groove 14.

[0026] Under the action of the bending lower insert springs 17, the lower insert 16 is lifted when the upper and lower molds are separated, in the clamping process, the middle bending upper insert 5 is contacted with the plate 21, the lower insert 16 is lowered and the bending lower insert springs 17 are compressed, and the plate 21 is effectively positioned.

[0027] Further, the top surface of the bending insert support 15 is provided with a semicircular groove 18, the bending lower insert 4 is in a cylindrical structure, the bending lower insert 4 is rotatably installed in the semicircular groove 18, the two ends of the bending lower insert 4 are connected with the bending insert support 15 through a second connecting rod 19, and the bending lower insert 4 is provided with a bending groove 20 matched with the acute angle bending part 13.

[0028] The second connecting rod 19 is an elastic rod, one end of the second connecting rod 19 is fixedly connected with the bending insert support 15, the other end of the second connecting rod 19 is fixedly connected with the bending lower insert 4, and the second connecting rod 19 can make the bending lower insert 4 rotate and then rotate reversely to restore to the original position.

[0029] The working principle of the present application is as follows: first, the upper die holder 1 is in the upper limit position, and the plate 21 is placed on the top of the lower insert 16; the upper die holder 1 descends with the press slide, the first protruding part at the bottom of the intermediate curved upper insert 5 contacts the plate 21, and the intermediate curved spring 8 and the curved lower insert spring 17 are further compressed; as the upper die holder 1 continues to descend, the bending upper inserts 3 on both sides also contact the plate 21, the bending spring 12 is compressed, and the bottom surface of the bending upper insert 3 gradually becomes flush with the bottom surface of the side bending upper insert 6; after the side bending upper insert 6 contacts the plate 21, the side bending spring 9 is gradually compressed, the first protruding part cooperates with the second recessed part, the first recessed part cooperates with the second protruding part, and the plate 21 is punched out of two curved structures, completing the bending forming of both sides. The upper die holder 1 continues to descend with the press slide, and the upper die as a whole and the lower insert 16 continue to descend, and the bending lower insert 4 is synchronously mechanically forced to rotate and cooperate with the profile of the bending upper insert 3, completing the negative angle bending of the part.

[0030] After the part is bent and formed, the upper die holder 1 ascends with the press slide, the bending lower insert 4 is reset under the action of the second connecting rod 19, the upper die holder 1 continues to ascend, the curved lower insert spring 17 returns, the lower insert 6 resets, continues to ascend, the side bending spring 9 returns, the side bending upper insert 6 resets, the bending upper insert 3 also synchronously returns, the upper die holder 1 continues to ascend, the intermediate curved spring 8 returns, the intermediate curved upper insert 5 resets, the part exits, and one working cycle ends.

[0031] To ensure the accuracy of the multi-process timing, the forming force is designed as follows: curved lower insert spring 17 > side bending spring 9 ≥ intermediate curved spring 8.

[0032] The above describes the structure, features and effects of the present application in detail according to the embodiments shown in the drawings. The above description is only the preferred embodiments of the present application, but the present application is not limited by the drawings shown. Any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, are still within the scope of protection of the present application, as long as they do not exceed the spirit of the specification and drawings.

Claims

1. A multi-step negative angle forming tool, comprising an upper die base (1) and a lower die base (2), characterized in that: An upper insert is installed at the bottom of the upper die base (1), and bending upper inserts (3) are installed on both sides of the upper insert; a lower insert (16) is installed at the top of the lower die base (2), and two bending lower inserts (4) are provided on both sides of the lower insert (16); The upper insert comprises a middle curved upper insert (5) and a side curved upper insert (6), the number of the middle curved upper insert (5) is one, the number of the side curved upper inserts (6) is two, and the two side curved upper inserts (6) are located on both sides of the middle curved upper insert (5); An upper insert mounting groove (7) is provided on the bottom surface of the upper die base (1), and the middle curved upper insert (5) and the side curved upper insert (6) are both mounted in the upper insert mounting groove (7), the middle curved upper insert (5) is connected to the groove bottom of the upper insert mounting groove (7) via a middle curved spring (8), and the side curved upper insert (6) is connected to the groove bottom of the upper insert mounting groove (7) via a side curved spring (9); the length of the middle curved spring (8) is longer than the length of the side curved spring (9); A limiting boss (10) is formed on the outer side walls of the two side bending upper inserts (6); the bending upper insert (3) is mounted on the side bending upper insert (6) via a first connecting rod (11); the top surface of the bending upper insert (3) is connected to the limiting boss (10) via a bending spring (12); and an acute-angle bending portion (13) is formed on the bending upper insert (3); A lower insert mounting groove (14) is provided on the top of the lower die base (2), a bent insert support (15) is fixedly provided at each end of the lower insert mounting groove (14), the lower insert (16) is located between the two bent insert supports (15), a plurality of bent lower insert springs (17) are provided at the bottom of the lower insert (16), and the lower ends of the bent lower insert springs (17) are fixedly connected to the bottom of the lower insert mounting groove (14); A semicircular groove (18) is provided on the top surface of the bending insert support (15); the bending lower insert (4) is a cylindrical structure; the bending lower insert (4) is rotatably mounted in the semicircular groove (18); and both ends of the bending lower insert (4) are connected to the bending insert support (15) via a second connecting rod (19); and a bending groove (20) is provided on the bending lower insert (4) to cooperate with the acute-angle bending portion (13).

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