A hemming mold

Abstract

The present invention provides a hemming mold, which includes a first pre-bending blade block, a second pre-bending blade block, a third pre-bending blade block, and a nitrogen cylinder mounting base. The nitrogen cylinder mounting base is arranged on a lower mold base, and the three pre-bending blade blocks are respectively arranged near three adjacent side surfaces of the nitrogen cylinder mounting base; the bottoms of the three pre-bending blade blocks are respectively slidably connected to the lower mold base through a guide sliding mechanism; three nitrogen cylinders are arranged in the nitrogen cylinder mounting base and are connected to the three pre-bending blade blocks in a one-to-one correspondence; the three pre-bending blade blocks are all provided with an arc-shaped pre-bending blade surface; when the mold is working, under the drive of the first nitrogen cylinder, the second nitrogen cylinder, and the third nitrogen cylinder, the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block respectively move in a direction away from the nitrogen cylinder mounting base, and use each arc-shaped pre-bending blade surface to pre-bend the flange at the "C"-shaped position of the tailgate. The present invention can achieve the pre-bending of each flange at the C-shaped structure on the tailgate, thereby completing the hemming and avoiding poor sealing.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle manufacturing, and in particular relates to a hemming die. Background Art

[0002] With the rapid development of the automotive industry, competition is intensifying. While the appearance of the vehicle is improving, product quality remains a core competitive advantage. Body openings and closing components, such as the hood, tailgate, and doors, require hemming to knead the inner and outer panels into an assembled unit. Poor hemming can lead to rust. Hemming requires two conditions: a flanged part and a pre-bent flange to a specific angle. Specifically, the flange must be pre-bent to a specific angle to achieve hemming.

[0003] Many models on the market now have taillights installed in a "C" shape, such as Figure 1 The positions a and b shown in the figure. Currently, the hemming mold used to process the edges of the tailgate 11 at positions a and b is driven by an inclined wedge, which drives two pre-flanging blades to complete the pre-flanging of the entire edge at this position. However, because the two pre-flanging blades are integral blades, they cannot pre-bend the upper and lower sides of the C-shaped position. This makes it easy for rust to occur due to poor sealing after sealing with glue. Therefore, how to design an hemming mold that can better achieve the pre-bending of the two C-shaped positions a and b has become a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide a hemming die to solve the above technical problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A hemming mold, comprising a first pre-bending blade block, a second pre-bending blade block, a third pre-bending blade block, and a nitrogen cylinder mounting base, wherein the nitrogen cylinder mounting base is arranged on a lower die base, and the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block are respectively arranged close to three adjacent side surfaces of the nitrogen cylinder mounting base; the bottom of the first pre-bending blade block is slidably connected to the lower die base via a first guide sliding mechanism, the bottom of the second pre-bending blade block is slidably connected to the lower die base via a second guide sliding mechanism, and the bottom of the third pre-bending blade block is slidably connected to the lower die base via a third guide sliding mechanism; a A first nitrogen cylinder connected to the first pre-bending blade block, a second nitrogen cylinder connected to the second pre-bending blade block, and a third nitrogen cylinder connected to the third pre-bending blade block; the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block are all provided with arc-shaped pre-bending blade surfaces; when the mold is working, under the drive of the first nitrogen cylinder, the second nitrogen cylinder, and the third nitrogen cylinder, the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block respectively move in a direction away from the nitrogen cylinder mounting base, and use each arc-shaped pre-bending blade surface to pre-bend the flange on each side of the "C"-shaped position of the tailgate.

[0007] Preferably, the nitrogen cylinder mounting base is a rectangular structure, the first pre-bent blade block is arranged close to the front side of the nitrogen cylinder mounting base, the second pre-bent blade block is arranged close to the left side of the nitrogen cylinder mounting base, and the third pre-bent blade block is arranged close to the rear side of the nitrogen cylinder mounting base.

[0008] Preferably, a first accommodating hole for accommodating the first nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a first limiting surface for blocking the bottom end of the first nitrogen cylinder is provided on the side of the first accommodating hole away from the first pre-bent blade block, and the driving end of the first nitrogen cylinder extends out of the front side surface and is threadedly connected to the first pre-bent blade block.

[0009] Preferably, a second accommodating hole for accommodating the second nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a second limiting surface for blocking the bottom end of the second nitrogen cylinder is provided on the side of the second accommodating hole away from the second pre-bent blade block, and the driving end of the second nitrogen cylinder extends out of the left side and is threadedly connected to the second pre-bent blade block.

[0010] Preferably, a third accommodating hole for accommodating the third nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a third limiting surface for blocking the bottom end of the third nitrogen cylinder is provided on the side of the third accommodating hole away from the third pre-bent blade block, and the driving end of the third nitrogen cylinder extends out of the rear side surface and is threadedly connected to the third pre-bent blade block.

[0011] Preferably, the nitrogen cylinder mounting base includes a first mounting base, a second mounting base and a third mounting base connected in sequence from top to bottom, the lower part of the first mounting base and the upper part of the second mounting base jointly form the second accommodating hole, the right section of the lower part of the second mounting base and the right section of the upper part of the third mounting base jointly form the first accommodating hole, and the left section of the lower part of the second mounting base and the left section of the upper part of the third mounting base jointly form the third accommodating hole.

[0012] Preferably, the second guide slide mechanism includes a limit base and a guide slide plate, the limit base is connected to the lower mold base and is perpendicular to the left side, and the guide slide plate is arranged at the bottom of the second pre-bent blade block; the lower part of the guide slide plate is provided with a T-shaped guide slide groove, and the upper part of the limit base has a T-shaped block adapted to the T-shaped guide slide groove, and the T-shaped guide slide groove slides with the T-shaped block.

[0013] Preferably, the upper portion of the position-limiting base is detachably connected to the lower portion of the position-limiting base.

[0014] Preferably, the lower portion of the position-limiting base is an L-shaped block, and the vertical surface of the L-shaped block is in contact with the front end surface of the T-shaped block.

[0015] Preferably, the guide slide plate is connected to the second pre-bent blade block by bolts.

[0016] The beneficial effects of the present invention are:

[0017] The hemming mold of the present invention, when in use, only needs to drive the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block to move in a direction away from the nitrogen cylinder mounting base by the first nitrogen cylinder, the second nitrogen cylinder, and the third nitrogen cylinder. Then, the arc-shaped pre-bending blade surface on each pre-bending blade block can be used to pre-bend the flanges on each side of the "C"-shaped position of the tailgate, thereby better realizing the pre-bending of the flanges at the C-shaped structure, and further better completing the hemming at this position, making it less likely that the position will be corroded due to poor sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail with reference to the drawings.

[0019] Figure 1 is a schematic diagram of an existing tailgate;

[0020] Figure 2 A schematic diagram of a hemming die provided in an embodiment of the present invention;

[0021] Figure 3 An exploded view of a hemming die provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the cooperation between the second pre-bent blade block and the second guide slide mechanism provided in an embodiment of the present invention;

[0023] Figure 5 A side view of the second pre-bent blade block and the second guide slide mechanism provided in an embodiment of the present invention when not engaged;

[0024] Figure 6 An axonometric view of the second pre-bent blade block and the second guide slide mechanism provided in an embodiment of the present invention when not in engagement;

[0025] Figure 7 A schematic diagram of the guide slide provided in an embodiment of the present invention being connected to the second pre-bent blade block.

[0026] In the accompanying drawings:

[0027] 11. Tailgate, 21. Nitrogen cylinder mounting base, 22. First mounting base,

[0028] 23. Second mounting base, 24. Third mounting base, 31. First pre-bent blade block,

[0029] 32. First guide slide mechanism, 41. Second pre-bent blade block, 42. Second guide slide mechanism,

[0030] 421, guide slide, 422, T-block, 423, L-block, 43, arc-shaped pre-bent blade,

[0031] 44, lower blade surface; 51, third pre-bent blade block, 61, first nitrogen cylinder,

[0032] 62. Second nitrogen cylinder, 63. Third nitrogen cylinder, 71. Lower die base. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the solution will be further described in detail below in conjunction with specific embodiments.

[0034] like Figures 2 to 7As shown, an embodiment of the present invention provides a hemming mold, which includes a first pre-bent blade block 31, a second pre-bent blade block 41, a third pre-bent blade block 51, and a nitrogen cylinder mounting base 21. The nitrogen cylinder mounting base 21 is arranged on a lower die base 71, and the first pre-bent blade block, the second pre-bent blade block, and the third pre-bent blade block are respectively arranged close to the three adjacent sides of the nitrogen cylinder mounting base 21; the bottom of the first pre-bent blade block is slidably connected to the lower die base through a first guide sliding mechanism 32, the bottom of the second pre-bent blade block is slidably connected to the lower die base through a second guide sliding mechanism 42, and the bottom of the third pre-bent blade block is slidably connected to the lower die base through a third guide sliding mechanism; the nitrogen A first nitrogen cylinder 61 connected to the first pre-bending blade block, a second nitrogen cylinder 62 connected to the second pre-bending blade block, and a third nitrogen cylinder 63 connected to the third pre-bending blade block are provided in the cylinder mounting base; the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block are all provided with an arc-shaped pre-bending blade surface 43; when the mold is working, under the drive of the first nitrogen cylinder, the second nitrogen cylinder, and the third nitrogen cylinder, the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block respectively move in a direction away from the nitrogen cylinder mounting base 21, and use each arc-shaped pre-bending blade surface to pre-bend the flange on each side of the "C"-shaped position of the tailgate.

[0035] The hemming mold provided in the embodiment of the present invention, when in use, only needs to drive the first pre-bending blade block 31, the second pre-bending blade block 41, and the third pre-bending blade block 51 to move in a direction away from the nitrogen cylinder mounting base through the first nitrogen cylinder 61, the second nitrogen cylinder 62, and the third nitrogen cylinder 63. Then, the arc-shaped pre-bending blade surface on each pre-bending blade block can be used to pre-bend the flanges on each side of the "C"-shaped position of the tailgate, thereby better achieving the pre-bending of the flanges on each side of the C-shaped position, and then completing the hemming at this position, making it less likely that rust will occur at this position due to poor sealing.

[0036] Further, if Figure 2 As shown, the nitrogen cylinder mounting base 21 is a rectangular structure, the first pre-bent blade block 31 is arranged close to the front side of the nitrogen cylinder mounting base, the second pre-bent blade block 41 is arranged close to the left side of the nitrogen cylinder mounting base, and the third pre-bent blade block 51 is arranged close to the rear side of the nitrogen cylinder mounting base, so that after the pre-bent blade blocks are installed, the arcuate blade surface of each pre-bent blade block can form a C shape.

[0037] Specifically, the nitrogen cylinder mounting base 21 is provided with a first receiving hole for accommodating the first nitrogen cylinder 61. A first limiting surface is provided on the side of the first receiving hole away from the first pre-bent blade block, which is configured to block the bottom end of the first nitrogen cylinder. The driving end of the first nitrogen cylinder extends out of the front side surface and is threadedly connected to the first pre-bent blade block. This solution allows the first nitrogen cylinder to be installed within the nitrogen cylinder mounting base.

[0038] Preferably, the nitrogen cylinder mounting base 21 is provided with a second receiving hole for accommodating the second nitrogen cylinder 62. A second limiting surface for interfacing with the bottom end of the second nitrogen cylinder is provided on a side of the second receiving hole away from the second pre-bent blade block. The driving end of the second nitrogen cylinder extends out of the left side surface and is threadedly connected to the second pre-bent blade block. This solution facilitates installation of the second nitrogen cylinder within the nitrogen cylinder mounting base using the second receiving hole.

[0039] Furthermore, the nitrogen cylinder mounting base 21 is provided with a third receiving hole for accommodating the third nitrogen cylinder 63. A third limiting surface is provided on the side of the third receiving hole, facing away from the third pre-bent blade block, for interfacing with the bottom end of the third nitrogen cylinder. The driving end of the third nitrogen cylinder extends out of the rear side surface and is threadedly connected to the third pre-bent blade block. This solution facilitates the installation of the third nitrogen cylinder within the nitrogen cylinder mounting base using the third receiving hole.

[0040] Specifically, the nitrogen cylinder mounting base includes a first mounting base 22, a second mounting base 23, and a third mounting base 24 connected in sequence from top to bottom. The lower portion of the first mounting base and the upper portion of the second mounting base together form the second receiving hole, the right section of the lower portion of the second mounting base and the right section of the upper portion of the third mounting base together form the first receiving hole, and the left section of the lower portion of the second mounting base and the left section of the upper portion of the third mounting base together form the third receiving hole. Using this solution, it is relatively convenient to set up each receiving hole in the nitrogen cylinder mounting base. At the same time, the first mounting base, the second mounting base, and the third mounting base are detachably connected to each other, which also facilitates the replacement or maintenance of each nitrogen cylinder.

[0041] Furthermore, the second guide mechanism 42 includes a limiting base and a guide slide 421. The limiting base is connected to the lower die base 71 and is perpendicular to the left side surface. The guide slide 421 is arranged at the bottom of the second pre-bending blade block. The lower portion of the guide slide is provided with a T-shaped guide groove. The upper portion of the limiting base has a T-shaped block 422 adapted to the T-shaped guide groove. The T-shaped guide groove and the T-shaped block are slidably engaged. With this solution, the sliding engagement between the T-shaped guide groove and the T-shaped block can better guide the movement direction of the second pre-bending blade block.

[0042] Specifically, the upper portion of the limiting base is detachably connected to the lower portion of the limiting base. It is understandable that the three nitrogen cylinders, three guide slide mechanisms, three pre-bending blade blocks and the nitrogen cylinder mounting base can be referred to as the pre-bending mechanism of the hemming mold.

[0043] Preferably, the lower portion of the limiting base is an L-shaped block 423, and the vertical surface of the L-shaped block is in contact with the front end surface of the T-shaped block, so that the vertical surface can be used to better limit the T-shaped block. It is understandable that the upper and lower portions of the limiting base can be connected to the lower die base by the same bolt; the arc-shaped pre-bent blade surface of each pre-bent blade block is its working portion, and the arc-shaped pre-bent blade surface protrudes from the lower blade surface 44 of the pre-bent blade block, that is, there is a step between the arc-shaped pre-bent blade surface 43 and the lower blade surface 44. When the pre-bent blade block is working, the arc-shaped pre-bent blade surface 43 will first approach the side of the C-shaped position of the tailgate, and then as the pre-bent blade block continues to move, the arc-shaped pre-bent blade surface will contact the flange on the above-mentioned side to bend the flange, thereby achieving the pre-bending of the flange, until the lower blade surface is in contact with the above-mentioned side, the pre-bent blade block stops moving, and the pre-bending work is completed.

[0044] Specifically, the guide slide 421 is bolted to the second pre-bend blade block 41, thereby facilitating replacement or maintenance of the guide slide. It is understandable that the first guide mechanism and the third guide mechanism have the same structure as the second guide mechanism, and are not described in detail here.

[0045] It can be understood that the specific curvature of each arc-shaped pre-bending blade surface can be designed according to the shape of the C-shaped position, so that the arc shape composed of each arc-shaped pre-bending blade surface is compatible with the arc surface at the C-shaped position; since the present invention is driven by each nitrogen cylinder to perform pre-bending work, it has good versatility and can meet the pre-bending work of flanging at C-shaped positions of different sizes; each nitrogen cylinder is electrically connected to the controller of the mold, and the controller controls the start and stop and working stroke of each nitrogen cylinder.

[0046] The general working principle of the present invention is as follows: when the mold is working, the first nitrogen cylinder, the second nitrogen cylinder and the third nitrogen cylinder are respectively ventilated in the forward direction, driving the first pre-bending blade block, the second pre-bending blade block and the third pre-bending blade block to move in the direction away from the nitrogen cylinder mounting base under the limiting and guiding action of their respective guide slide mechanisms until the pre-bending work of the flanges on each side of the C-shaped position of the tailgate is completed, at which time each arc-shaped pre-bending blade surface is formed; then each nitrogen cylinder is ventilated in the reverse direction, driving each pre-bending blade block to complete the return movement. The present invention can pre-bend the flanges on each side of the C-shaped position of the tailgate, thereby better completing the hemming at this position, solving the problem in the prior art that the flanges on the upper and lower sides of this position cannot be pre-bent well, and the hemming of the flanges on each side of this position cannot be better achieved, resulting in the problem of poor sealing and rust at this position. However, each pre-bending blade block of the present invention has an arc-shaped pre-bending blade surface, and each pre-bending blade block is driven by a separate nitrogen cylinder. Therefore, it is only necessary to set the working stroke of each nitrogen cylinder through the controller to conveniently solve the angle problem between the flanges of the upper and lower sides at that position and the flanges of the vertical part, thereby better realizing the pre-bending work of the flanges at that position.

[0047] The above are only preferred embodiments of the present invention. It should be pointed out that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, after reading the contents of the present invention, relevant technical personnel in this field can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A hemming mold, characterized in that: It includes a first pre-bent blade block, a second pre-bent blade block, a third pre-bent blade block, and a nitrogen cylinder mounting base. The nitrogen cylinder mounting base is arranged on the lower die base. The first pre-bent blade block, the second pre-bent blade block, and the third pre-bent blade block are respectively arranged close to three adjacent sides of the nitrogen cylinder mounting base; the bottom of the first pre-bent blade block is slidably connected to the lower die base through a first guide sliding mechanism, the bottom of the second pre-bent blade block is slidably connected to the lower die base through a second guide sliding mechanism, and the bottom of the third pre-bent blade block is slidably connected to the lower die base through a third guide sliding mechanism; a mechanism is provided in the nitrogen cylinder mounting base for sliding contact with the lower die base. a first nitrogen cylinder connected to the first pre-bending blade block, a second nitrogen cylinder connected to the second pre-bending blade block, and a third nitrogen cylinder connected to the third pre-bending blade block; the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block are all provided with arc-shaped pre-bending blade surfaces; when the mold is working, under the drive of the first nitrogen cylinder, the second nitrogen cylinder, and the third nitrogen cylinder, the first pre-bending blade block, the second pre-bending blade block, and the third pre-bending blade block are respectively moved in a direction away from the nitrogen cylinder mounting base, and each arc-shaped pre-bending blade surface is used to pre-bend the flange on each side of the "C"-shaped position of the tailgate; The nitrogen cylinder mounting base is a rectangular structure, the first pre-bent blade block is arranged close to the front side of the nitrogen cylinder mounting base, the second pre-bent blade block is arranged close to the left side of the nitrogen cylinder mounting base, and the third pre-bent blade block is arranged close to the rear side of the nitrogen cylinder mounting base.

2. The hemming mold according to claim 1, characterized in that: A first accommodating hole for accommodating the first nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a first limiting surface for blocking the bottom end of the first nitrogen cylinder is provided on a side of the first accommodating hole away from the first pre-bent blade block. The driving end of the first nitrogen cylinder extends out of the front side surface and is threadedly connected to the first pre-bent blade block.

3. The hemming mold according to claim 2, characterized in that: A second accommodating hole for accommodating the second nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a second limiting surface for blocking the bottom end of the second nitrogen cylinder is provided on the side of the second accommodating hole away from the second pre-bent blade block. The driving end of the second nitrogen cylinder extends out of the left side and is threadedly connected to the second pre-bent blade block.

4. The hemming mold according to claim 3, characterized in that: A third accommodating hole for accommodating the third nitrogen cylinder is provided in the nitrogen cylinder mounting base, and a third limiting surface for blocking the bottom end of the third nitrogen cylinder is provided on a side of the third accommodating hole away from the third pre-bent blade block. The driving end of the third nitrogen cylinder extends out of the rear side surface and is threadedly connected to the third pre-bent blade block.

5. The hemming mold according to claim 4, characterized in that: The nitrogen cylinder mounting base includes a first mounting base, a second mounting base, and a third mounting base connected in sequence from top to bottom. The lower portion of the first mounting base and the upper portion of the second mounting base jointly form the second accommodating hole, the right section of the lower portion of the second mounting base and the right section of the upper portion of the third mounting base jointly form the first accommodating hole, and the left section of the lower portion of the second mounting base and the left section of the upper portion of the third mounting base jointly form the third accommodating hole.

6. The hemming mold according to claim 1, characterized in that: The second guide slide mechanism includes a limit base and a guide slide. The limit base is connected to the lower mold base and is perpendicular to the left side. The guide slide is arranged at the bottom of the second pre-bent blade block. A T-shaped guide slide groove is provided at the lower part of the guide slide. The upper part of the limit base has a T-shaped block adapted to the T-shaped guide slide groove, and the T-shaped guide slide groove slides with the T-shaped block.

7. The hemming mold according to claim 6, characterized in that: The upper portion of the position-limiting base is detachably connected to the lower portion of the position-limiting base.

8. The hemming mold according to claim 7, characterized in that: The lower part of the limiting base is an L-shaped block, and the vertical surface of the L-shaped block is blocked and connected with the front end surface of the T-shaped block.

9. The hemming mold according to claim 6, characterized in that: The guide slide plate is connected to the second pre-bent blade block with bolts.

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