A sheet metal hemming stamping die

Abstract

The present invention discloses a plate folding stamping die, comprising: a movable die assembly and a fixed die assembly below the movable die assembly, the fixed die assembly comprising a fixed die seat, a punching die and a folding punch, the folding punch is arranged on the fixed die seat and located inside the punching die, the floating pressure block is arranged inside the punching punch, the bottom of the first demoulding top plate is provided with a downward push rod, the bottom of the push rod is provided with a push plate, the guide hole is provided with a second spring to elastically push the push plate upward, the two sides of the folding punch are provided with a slide groove extending to the bottom, the slide groove is provided with a second demoulding top plate extending to the outside of the folding punch, and the second demoulding top plate is provided with a connecting rod connected to the push rod. Through the above manner, the present invention realizes the punching of the plate and the folding of the two sides, has high production efficiency, increases the demoulding speed of the product, and reduces the demoulding resistance and deformation problems of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly to a sheet metal hemming stamping mold. Background Art

[0002] In order to improve the production efficiency of workpieces, batch metal sheet bending parts are mostly formed by molds. Usually, the sheet metal needs to be punched first, and then transferred to another device for hemming and forming, which greatly reduces the costs of welding and machining. However, punching and transfer hemming are two processes that require secondary positioning, which is not conducive to ensuring the dimensional accuracy of the workpieces.

[0003] The thickness of some metal sheets is relatively thin and the strength is low. Although the stamping difficulty is small, the demolding difficulty of large workpieces is large. The traditional ejector pin demolding method is easy to form grooves or bumps on the surface of the sheet metal, and due to the poor strength, single ejector pin demolding is also prone to cause deformation problems of the product. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide a sheet metal hemming stamping mold to achieve one-time punching and hemming of the sheet metal, and improve the demolding efficiency and product quality stability.

[0005] To solve the above technical problem, a technical solution adopted by the present invention is: providing a sheet metal hemming stamping mold, including: a moving die assembly and a fixed die assembly below it. The moving die assembly includes a floating pressure block, a moving die base, and a punching punch arranged at the bottom of the moving die base. The fixed die assembly includes a fixed die base, a punching die cavity, and a hemming punch. The punching die cavity is arranged on the fixed die base and corresponds to the punching punch. The hemming punch is arranged on the fixed die base and is located inside the punching die cavity. The floating pressure block is arranged inside the punching punch. A screw rod connected to the top of the floating pressure block is arranged in the moving die base. A first spring is arranged on the screw rod. The top surface of the hemming punch is concavely provided with an embedding groove. A first demolding top plate is arranged in the embedding groove. A downward ejector pin is arranged at the bottom of the first demolding top plate. A push plate is arranged at the bottom of the ejector pin. A guiding hole corresponding to the push plate is arranged in the fixed die base. A second spring is arranged in the guiding hole to elastically push up the push plate. The two sides of the hemming punch are concavely provided with sliding grooves extending to the bottom. A second demolding top plate extending to the outside of the hemming punch is arranged in the sliding grooves. A connecting rod connected to the ejector pin is arranged in the second demolding top plate. A avoiding groove corresponding to the connecting rod is concavely arranged at the bottom of the hemming punch.

[0006] In a preferred embodiment of the present invention, the punching punch includes two first punching blocks distributed at intervals, and the punching die cavity includes two second punching blocks distributed at intervals.

[0007] In a preferred embodiment of the present invention, the distance between the inner sides of the two second stamping blocks corresponds to the distance between the outer sides of the two first stamping blocks, and the width of the hemming punch is less than the distance between the inner sides of the two first stamping blocks.

[0008] In a preferred embodiment of the present invention, a cover plate is provided in the fixed mold base below the guide hole.

[0009] In a preferred embodiment of the present invention, a rubber pad is provided on the top of the second demolding top plate.

[0010] In a preferred embodiment of the present invention, a downward slope pointing outward is provided on the top of the rubber pad.

[0011] In a preferred embodiment of the present invention, a guide groove corresponding to the width of the plate is concavely provided on the top surface of the second stamping block.

[0012] The beneficial effects of the present invention are as follows: A plate hemming stamping die pointed out by the present invention, the plate raw material is sent to the fixed mold assembly through the guide groove, the moving mold assembly presses down so that the punching punch contacts the top surface of the plate raw material, and punching is carried out through the cooperation of the punching die. The punching punch continues to press down and cooperates with the hemming punch to realize the hemming of both sides of the plate. The production efficiency is high, the problem of secondary positioning is avoided. When the mold is opened, the first demolding top plate loses the oppression of the floating pressing block and rises under the action of the second spring to push up the top of the plate. At the same time, the second demolding top plate moves up accordingly to push up the hemming parts on both sides of the plate, improving the demolding speed of the product and reducing the demolding resistance and deformation problems of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0014] Figure 1 is a schematic structural diagram of a preferred embodiment of a plate hemming stamping die of the present invention;

[0015] Figure 2 is Figure 1 the left view of the hemming punch in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1 - 2 , the embodiments of the present invention include:

[0018] As Figure 1 shown in the sheet metal hemming and stamping die, which includes: a moving die assembly and a fixed die assembly below it. The moving die assembly includes a floating pressure block 22, a moving die base 2, and a punching convex die arranged at the bottom of the moving die base 2. In this embodiment, the punching convex die includes two first punching blocks 21 distributed at intervals, and the distance between the outer sides of the two first punching blocks corresponds to the length of a section of sheet metal 3 to be punched.

[0019] The fixed die assembly includes a fixed die base 1, a punching concave die, and a hemming convex die 11. The punching concave die is arranged on the fixed die base 1 and corresponds to the punching convex die. In this embodiment, as Figure 1 shown, the punching concave die includes two second punching blocks 14 distributed at intervals. The top surface of the second punching block 14 is recessed with a guiding groove 141 corresponding to the width of the sheet metal 3, which is beneficial for intermittently conveying a longer sheet metal raw material to the fixed die assembly through the guiding groove 141 to avoid skewing problems.

[0020] The floating pressure block 22 is arranged inside the punching convex die. A screw 23 connected to the top of the floating pressure block 22 is arranged in the moving die base 2, and a first spring 24 is arranged on the screw for elastic pressing of the floating pressure block 22. When the die is closed, the bottom surface of the floating pressure block 22 contacts the upper surface of the sheet metal to realize pressing and fixing of the sheet metal and avoid loosening problems.

[0021] In this embodiment, the distance between the inner sides of the two second punching blocks 14 corresponds to the distance between the outer sides of the two first punching blocks 21. When the die is closed, the sheet metal raw material is punched to obtain a section of sheet metal 3 with a fixed length. In this embodiment, the hemming convex die 11 is arranged on the fixed die base 1 and inside the punching concave die. The width of the hemming convex die 11 is smaller than the distance between the inner sides of the two first punching blocks 21, for hemming both sides of the sheet metal 3, so that both sides of the sheet metal 3 are bent downward and extended. With one die closing, the punching and hemming of the sheet metal 3 are completed, and the production efficiency is high.

[0022] As Figure 1 shown, the top surface of the hemming convex die is recessed with an embedding groove 119, and a first demolding top plate 115 is arranged in the embedding groove 119. When the die is closed, the floating pressure block 22 presses on the top surface of the sheet metal 3, and the first demolding top plate 115 is pressed down through the sheet metal 3.

[0023] A push rod 112 is provided downward at the bottom of the first demolding top plate 115. A push plate 113 is provided at the bottom of the push rod 112. A guide hole corresponding to the push plate 113 is provided in the fixed mold base 1. A second spring 13 is provided in the guide hole to elastically push up the push plate 113. The middle part of the plate 3 is lifted by the first demolding top plate 115 to realize the demolding of the plate 3 during mold opening. In this embodiment, a cover plate 12 is provided at the bottom of the fixed mold base 1 below the guide hole. The cover plate 12 is fixed by screws to limit the bottom of the second spring 13, which is convenient for disassembly and assembly.

[0024] Concave portions are provided on both inner sides of the flanging punch 11 and extend to the bottom to form sliding grooves 118, as Figure 2 shown. A second demolding top plate 116 extending to the outside of the flanging punch is provided in the sliding groove 118. In this embodiment, the second demolding top plate 116 adopts a long strip plate structure. A connecting rod 114 connected to the push rod 112 is provided in the second demolding top plate 116, so that the second demolding top plate 116 can rise synchronously with the first demolding top plate 115 to lift the flanging parts on both sides of the plate 3 and improve the demolding effect.

[0025] A relief groove 111 corresponding to the connecting rod 114 is concavely provided at the bottom of the flanging punch 11. The cross section of the relief groove 111 is an inverted U-shaped structure pointing downward to guide and limit the lifting of the connecting rod 114 and prevent the first demolding top plate 115 and the push rod 112 from flying off during mold opening.

[0026] A rubber pad 117 is provided at the top of the second demolding top plate. During demolding, the rubber pad 117 contacts the bottom ends of the flanging parts on both sides of the plate 3 to avoid damage to the bottom ends of the flanging parts on both sides of the plate 3. After the plate 3 is flanged, the flanging parts on both sides are clamped on both sides of the flanging punch 11, and the demolding resistance is large. In this embodiment, a downward slope pointing outward is provided at the top of the rubber pad 117. The downward slope contacts the bottom ends of the flanging parts on both sides of the plate 3 to give an outward tension to the flanging parts on both sides of the plate 3 (the flanging parts on both sides can elastically reset after mold opening), reduce the contact and friction between the flanging parts on both sides and the flanging punch 11, and thus reduce the demolding resistance.

[0027] In summary, a plate flanging stamping die pointed out by the present invention realizes the punching and flanging of the plate, has high production efficiency, improves the mold opening effect, and avoids the deformation problem of the workpiece during mold opening.

[0028] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made using the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A sheet metal flanging stamping die for punching, flanging and demolding of sheet metal, characterized in that, Comprising: A moving die assembly and a stationary die assembly below it. The moving die assembly includes a floating pressure block, a moving die base, and a punching punch disposed at the bottom of the moving die base. The stationary die assembly includes a stationary die base, a punching die cavity, and a flanging punch. The punching die cavity is disposed on the stationary die base and corresponds to the punching punch. The flanging punch is disposed on the stationary die base and is located inside the punching die cavity. The floating pressure block is disposed inside the punching punch. A screw rod connected to the top of the floating pressure block is provided in the moving die base. A first spring is provided on the screw rod. An embedding groove is concavely provided on the top surface of the flanging punch. A first demolding top plate is provided in the embedding groove. A downward ejector rod is provided at the bottom of the first demolding top plate. A push plate is provided at the bottom of the ejector rod. A guiding hole corresponding to the push plate is provided in the stationary die base. A second spring is provided in the guiding hole to elastically push up the push plate. Sliding grooves extending to the bottom are concavely provided on both sides of the flanging punch. A second demolding top plate extending to the outside of the flanging punch is provided in the sliding grooves. A connecting rod connected to the ejector rod is provided in the second demolding top plate. An avoidance groove corresponding to the connecting rod is concavely provided at the bottom of the flanging punch. A rubber pad is provided at the top of the second demolding top plate. A downward slope pointing outward is provided at the top of the rubber pad to reduce the demolding resistance. The punching punch includes two spaced-apart first punching blocks. The punching die cavity includes two spaced-apart second punching blocks.

2. The sheet metal hemming stamping die according to claim 1, wherein The distance between the inner sides of the two second punching blocks corresponds to the distance between the outer sides of the two first punching blocks. The width of the flanging punch is less than the distance between the inner sides of the two first punching blocks.

3. The sheet metal hemming stamping die according to claim 1, characterized in that, A cover plate is provided in the stationary die base below the guiding hole.

4. The sheet metal hemming stamping die according to claim 1, wherein, A guiding groove corresponding to the width of the sheet is concavely provided on the top surface of the second punching block.

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