Bending die for preventing wrinkles at bending corner

Abstract

The utility model discloses a kind of bending moulds for preventing wrinkling of bending corner, including lower mould plate, the corner of lower mould plate is equipped with detachable male part;The profile of the male part towards the side of product to be bent is outwardly offset relative to the preset bending line of product corner, so that extrusion gap is formed between the male part and the bending part of product corner to be bent.The extrusion gap formed by the profile of the male part outwardly offset relative to the preset bending line can guide material to flow along the preset path during bending process, avoid material to be accumulated disorderly at corner, solve wrinkling problem in corner forming of backboard from the root.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a bending mold that prevents wrinkling at bending corners. Background Technology

[0002] In the field of metal sheet bending, especially in the bending and forming of corners, wrinkling is a common technical problem that directly affects product quality and production efficiency. Existing technologies offer several solutions to the wrinkling problem during bending, the most relevant being the "Method for Inner Bending and Flattening of TV Frame Edges" (publication number CN111229900A, corresponding to application number CN202010040559). This prior art discloses a solution to wrinkling and cracking through a step-by-step bending process. Its core principle is as follows: first, the horizontal edge of the TV frame is obliquely bent at 60°~70°, then bent at 90° to form a side fold edge. Subsequently, an inner fold edge is formed through side bending, and finally, it is flattened inwards. The step-by-step operation of "oblique bending followed by 90° bending" disperses material stress, and the pre-folding protrusion on the inner slider ensures the accuracy of the fold line, thereby reducing wrinkling and cracking.

[0003] However, the aforementioned existing technologies still have significant limitations: First, the process is highly complex, requiring the sequential use of slanting dies, bending dies, side bending dies, and side flattening dies. This multi-step process results in low production efficiency and high die investment costs. Second, the applicable scenarios are limited. The core idea is to disperse stress through step-by-step bending, which is only suitable for edge-forming structures that can be formed in steps (such as TV frames). For corner structures that require a 90° bend in one go (such as right-angle corners of small metal parts), it cannot be achieved through step-by-step operations, and there is still the problem of material accumulation at the corner and wrinkling caused by uncontrolled flow. Third, stress dispersion relies on the coordination of multiple processes. If the matching accuracy of the parameters of each process is insufficient, it may lead to material fatigue at the corner due to multiple bends, increasing the risk of cracking.

[0004] Therefore, existing technologies have not yet provided an effective solution to the corner wrinkling problem in a one-time 90° bend scenario, and there is an urgent need for a technical solution that is simple in process, low in cost, and can accurately control the material flow. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a bending mold that prevents wrinkling at the bending corner, which can solve the wrinkling problem in the corner forming of the back plate.

[0006] To solve the above-mentioned technical problems, this utility model discloses a bending die for preventing wrinkling at bending corners, including a lower template, wherein a detachable insert is provided at the corner of the lower template; the side profile of the insert facing the product to be bent is offset outward relative to the preset bending line of the product corner, so that an extrusion gap is formed between the insert and the part of the product corner to be bent.

[0007] As an optional implementation, the outer contour of the insert is the same as the shape of the preset bending line of the product to be bent, and each segment of the outer contour of the insert extends outward by a preset length relative to the preset bending line to form the extrusion gap.

[0008] As another optional implementation, the preset length is 0.08~0.12mm.

[0009] As another alternative implementation, the insert is made of a metal material.

[0010] As another optional implementation, the insert and the lower template are detachably connected by bolts.

[0011] As another optional implementation, the lower template is provided with a positioning component, which is used to limit the horizontal displacement of the product to be bent during the bending process.

[0012] As another optional implementation, the positioning component includes at least two positioning pins, which are symmetrically distributed on both sides of the corner of the lower template.

[0013] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: This utility model embodiment achieves modular mold design by setting a detachable insert at the corner, which facilitates the individual processing, replacement and maintenance of the insert and reduces the overall manufacturing cost of the mold. The extrusion gap formed by the outward offset of the insert contour relative to the preset bending line can guide the material to flow along the preset path during the bending process, avoid the disorderly accumulation of material at the corner, and solve the problem of wrinkling at the corner from the root. It is applicable to various metal plates (such as steel plates, aluminum plates, etc.) that require bending at 90° or a specific angle, and has strong versatility. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a schematic diagram of the lower template of a bending die for preventing wrinkles at bending corners, as disclosed in an embodiment of this utility model. Figure 2 This is a disclosure of the embodiments of this utility model. Figure 1 A magnified view of a portion of the image; Figure 3 This is a structural schematic diagram of a product to be bent, as disclosed in an embodiment of this utility model; Figure 4 This is a schematic diagram showing the relationship between the lower template of a bending die for preventing wrinkles at bending corners and the installation position of the product to be bent, as disclosed in an embodiment of this utility model. Figure 5 This is a disclosure of the embodiments of this utility model. Figure 4 A magnified view of a portion of the image. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] See Figures 1-5 This utility model discloses a bending die for preventing wrinkling at bending corners, including a lower template 1. A detachable insert 2 is provided at the corner of the lower template 1. The side profile of the insert 2 facing the product 3 to be bent is offset outward relative to the preset bending line 4 of the product corner, so that an extrusion gap is formed between the insert 2 and the part of the product corner to be bent.

[0018] This utility model embodiment achieves modular mold design by setting a detachable insert 2 at the corner, which facilitates the individual processing, replacement and maintenance of the insert 2 and reduces the overall manufacturing cost of the mold. The extrusion gap formed by the outward offset of the insert 2 profile relative to the preset bending line 4 can guide the material to flow along the preset path during the bending process, avoid disorderly accumulation of material at the corner, and solve the corner wrinkling problem from the root. It is applicable to various metal plates (such as steel plates, aluminum plates, etc.) that require bending at 90° or a specific angle, and has strong versatility.

[0019] For example, for a 1mm thick stainless steel sheet (product 3 to be bent), a detachable insert 2 is installed at the 90° corner of the lower template 1. The contour of the side of the insert 2 facing the sheet corresponds to the preset bending line 4 (right-angle bend) of the sheet corner, and is offset outward by 0.1mm from the preset bending line 4, forming an L-shaped extrusion gap. During bending, the sheet deforms along the preset bending line 4 under pressure, and the material flows evenly under the constraint of the extrusion gap, avoiding wrinkles at the corner. After bending, the flatness of the corner reaches within 0.05mm.

[0020] In an optional embodiment, the outer contour of the insert 2 is the same as the shape of the preset bending line 4 of the product to be bent 3, and each segment of the outer contour of the insert 2 extends outward by a preset length relative to the preset bending line 4 to form the extrusion gap.

[0021] In this embodiment, the outer contour of the insert 2 is the same as the shape of the preset bending line 4, ensuring that the extrusion gap is evenly distributed along the bending path and avoiding material flow imbalance caused by excessively large or small local gaps; the design of "each segment extending outward beyond the preset length" ensures that the gap remains consistent in complex corners (such as corners composed of multiple fold lines), further improving the anti-wrinkling effect; the contour of the insert 2 can be flexibly adjusted according to the bending line shape of different products, making it more adaptable.

[0022] In yet another optional embodiment, the preset length is 0.08~0.12mm.

[0023] In this embodiment, the preset length range of 0.08~0.12mm has been verified by a large number of experiments. It can provide sufficient space for material flow (avoiding material extrusion and cracking due to excessive gaps) and prevent excessive material accumulation through appropriate constraints (avoiding wrinkling). This range is suitable for most metal plates with a thickness of 0.3~2mm, eliminating the need to frequently adjust the size of the insert 2 for different thicknesses, thus simplifying the process parameter settings.

[0024] In another optional embodiment, the insert 2 is made of a metal material. Metal materials have high strength and high wear resistance, and can withstand repeated extrusion and friction during bending, extending the service life of the insert 2 (3-5 times longer than non-metallic materials). The rigidity of the metal material ensures the stability of the insert 2's outline dimensions, preventing changes in the extrusion gap due to deformation and guaranteeing bending accuracy. Different metal materials (such as mold steel, cemented carbide, etc.) can be selected according to the application scenario to balance cost and performance.

[0025] In another optional embodiment, the insert 2 and the lower template 1 are detachably connected by bolts. The bolt connection enables quick assembly and disassembly of the insert 2 and the lower template 1, facilitating the replacement of the insert 2 with the corresponding contour according to different products, thus improving the versatility of the mold; the detachability of the bolt connection allows the insert 2 to be replaced individually after wear, without scrapping the entire lower template 1, reducing maintenance costs; the connection strength is high, there is no loosening during bending, and the gap stability is guaranteed.

[0026] In another optional embodiment, the lower template 1 is provided with a positioning component (not shown in the figure), which is used to limit the horizontal displacement of the product 3 to be bent during the bending process.

[0027] In another optional embodiment, the positioning component includes at least two positioning pins symmetrically distributed on both sides of the corner of the lower template 1.

[0028] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A bending die for preventing wrinkling at bending corners, comprising a lower template, characterized in that, The lower template is provided with a detachable insert at the corner; the side profile of the insert facing the product to be bent is offset outward relative to the preset bending line of the product corner, so that an extrusion gap is formed between the insert and the part of the product corner to be bent.

2. The bending die according to claim 1, characterized in that, The outer contour of the insert is the same as the shape of the preset bending line of the product to be bent, and each segment of the outer contour of the insert extends outward by a preset length relative to the preset bending line to form the extrusion gap.

3. The bending die according to claim 2, characterized in that, The preset length is 0.08~0.12mm.

4. The bending die according to claim 1, characterized in that, The insert is made of metal.

5. The bending die according to claim 1, characterized in that, The insert and the lower template are detachably connected by bolts.

6. The bending die according to claim 1, characterized in that, The lower template is provided with a positioning component, which is used to limit the horizontal displacement of the product to be bent during the bending process.

7. The bending die according to claim 6, characterized in that, The positioning component includes at least two positioning pins, which are symmetrically distributed on both sides of the corner of the lower template.

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