Unstressed punching and packaging device for ultrathin metal sheet

Abstract

The utility model aims to disclose a stress-free punching and packaging device for an ultrathin metal sheet, which relates to the technical field of ultrathin metal sheet forming and is characterized in that an upper die assembly is provided with a forming block, and the bottom of the forming block is provided with a first groove, a second groove and a third groove; the lower die assembly comprises a floating block, a first punch, a second punch and a third punch, the first punch, the second punch and the third punch ascend and descend synchronously, the section contour of the second punch is equidistantly expanded by a first distance compared with the section contour of the first punch, and the section contour of the third punch is equidistantly expanded by a second distance compared with the section contour of the second punch. The first distance is equal to the second distance; the method has the technical effects that the same position of the ultra-thin metal sheet is punched by the first punch, the second punch and the third punch in sequence, the forming size and depth of the convex hull are gradually increased, and the stretching gap during punching each time is 1 / 3 of the thickness of the ultra-thin metal sheet, that is, stretching deformation each time is very small, so that stress concentration cannot be generated in the punching process, and the metal sheet is prevented from warping.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-thin metal sheet forming, in particular to an ultra-thin metal sheet stress-free punching device and an ultra-thin metal sheet. Background Art

[0002] With the rapid development of 3C electronics and precision machining, it is sometimes necessary to form a bulge on the surface of an ultra-thin metal sheet so that the bulge can avoid other components when the ultra-thin metal sheet is in use. During the bulge formation process, the surrounding areas of the bulge are over-stretched, and there is excessive flow of the material, resulting in stress concentrated around the bulge and unable to be released, causing the ultra-thin metal sheet with the bulge formed by punching to warp. The existence of warping makes the ultra-thin metal sheet unusable during use. For example, when the ultra-thin metal sheet is welded to another component, if the warping exists, it is easy to cause cold welding, thereby causing product quality defects.

[0003] In view of this, it is necessary to develop a stress-free punching device for ultra-thin metal sheets and an ultra-thin metal sheet. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present utility model is to disclose an ultra-thin metal sheet stress-free punching device and an ultra-thin metal sheet.

[0005] The first invention purpose of the utility model is to develop a stress-free punching device for ultra-thin metal sheets.

[0006] The second invention objective of the present utility model is to develop an ultra-thin metal sheet.

[0007] In order to achieve the above-mentioned first utility model object, the utility model provides an ultra-thin metal sheet stress-free punching device, comprising an upper die assembly and a lower die assembly;

[0008] A forming block is provided on the upper mold assembly, and a first groove, a second groove and a third groove are provided on the bottom of the forming block;

[0009] The lower die assembly includes a floating block and a first punch, a second punch, and a third punch that rise and fall synchronously, wherein the cross-sectional profile of the second punch is equidistantly enlarged by a first distance compared to the cross-sectional profile of the first punch, and the cross-sectional profile of the third punch is equidistantly enlarged by a second distance compared to the cross-sectional profile of the second punch;

[0010] The first distance is equal to the second distance;

[0011] The first punch and the first groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet, the second punch and the second groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet, and the third punch and the third groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet.

[0012] Preferably, the groove depth of the third groove is greater than the groove depth of the second groove and greater than the groove depth of the first groove.

[0013] Preferably, the groove depth of the third groove is 0.45 mm, the groove depth of the second groove is 0.35 mm, and the groove depth of the first groove is 0.25 mm.

[0014] Preferably, the thickness of the ultra-thin metal sheet is 0.15 mm-0.3 mm.

[0015] Preferably, the first groove, the second groove and the third groove are all rectangular grooves, and the four top corners of the rectangular groove are rounded corners.

[0016] Preferably, it also includes a dotting assembly, which includes an upper forming block and a lower forming block, a plurality of first protrusions are set on the bottom of the upper forming block, and a plurality of second protrusions are set on the top of the lower forming block, and the first protrusions and the second protrusions are arranged in coordination.

[0017] Preferably, the ends of the first convex point and the second convex point are square, and the side length of the square is 0.05 mm.

[0018] Preferably, a plurality of top blocks and springs are respectively arranged below the floating block.

[0019] Based on the same inventive principle, in order to achieve the above-mentioned second inventive object, the present invention provides an ultra-thin metal sheet, comprising a metal sheet body and at least one convex hull provided on the metal sheet body;

[0020] The convex hull stretching gap is 1 / 3 of the thickness of the ultra-thin metal sheet.

[0021] Preferably, the thickness of the ultra-thin metal sheet is 0.15 mm to 0.3 mm;

[0022] The convex hull is a rectangular hull, and the four corners of the rectangular hull are rounded.

[0023] Compared with the prior art, the technical effects of this utility model are as follows:

[0024] The ultra-thin metal sheet of the present invention is arranged on the material strip, and the same position of the ultra-thin metal sheet is punched by the first punch, the second punch and the third punch in sequence. The cross-sectional profile of the second punch is equidistantly enlarged by a first distance than the cross-sectional profile of the first punch, and the cross-sectional profile of the third punch is equidistantly enlarged by a second distance than the cross-sectional profile of the second punch. The first distance is equal to the second distance, so that the forming size and depth of the bulge are gradually increased, and the stretching gap during each punching is 1 / 3 of the thickness of the ultra-thin metal sheet, that is, the stretching deformation each time is very small, and the material fluidity during stamping is very small, so that stress concentration will not occur during the punching process, thereby avoiding warping of the ultra-thin metal sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a cross-sectional schematic diagram of the stress-free punching device for ultra-thin metal sheets of the utility model.

[0027] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure.

[0028] Figure 3 This utility model Figure 1 Schematic diagram of the enlarged structure at point B.

[0029] Figure 4 It is a schematic diagram of the mold opening state of the stress-free punching device for ultra-thin metal sheets of the utility model.

[0030] Figure 5 It is a schematic diagram of the ultra-thin metal sheet of the utility model.

[0031] Figure 6 (a) is a schematic diagram of the first convex hull of the present invention.

[0032] Figure 6 (b) is a schematic diagram of the second convex hull of the present invention.

[0033] Figure 6 (c) is a schematic diagram of the third convex hull of the present invention.

[0034] Figure 7 It is a schematic diagram of the existing convex hull.

[0035] Among them, 1. Upper mold assembly; 2. Lower mold assembly; 21. First punch; 22. Second punch; 23. Third punch; 3. Forming block; 31. First groove; 32. Second groove; 33. Third groove 33; 4. Floating block; 5. First bulge; 6. Second bulge; 7. Third bulge; 8. Spring; 81. Top block; 9. Dotting assembly; 91. Upper molding block; 911. First bulge; 92. Lower molding block; 921. Second bulge; 10. Metal sheet body; 101. bulge. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Example 1

[0038] Ginseng Figures 1 to 6 As shown, this embodiment discloses a specific implementation of a stress-free punching device for ultra-thin metal sheets (hereinafter referred to as "punching device").

[0039] This embodiment provides a stress-free punching device for ultra-thin metal sheets. Figures 1 to 6As shown, it includes an upper die assembly 1 and a lower die assembly 2; a forming block 3 is provided on the upper die assembly 1, and a first groove 31, a second groove 32 and a third groove 33 are provided at the bottom of the forming block 3, the groove depth of the third groove is greater than the groove depth of the second groove> the groove depth of the first groove; the lower die assembly 2 includes a floating block 4 and a first punch 21, a second punch 22 and a third punch 23 that rise and fall synchronously, the cross-sectional profile of the second punch 22 is equidistantly enlarged by a first distance L1 than the cross-sectional profile of the first punch 221, and the cross-sectional profile of the third punch 23 is equidistantly enlarged by a second distance L2 than the cross-sectional profile of the second punch 22; the first distance L1 is equal to the second distance L2; the first punch 21 and the first groove 31 cooperate with each other and the stretching gap between the two is 1 / 3 of the thickness of the ultra-thin metal sheet, the second punch 22 and the second groove 32 cooperate with each other and the stretching gap between the two is 1 / 3 of the thickness of the ultra-thin metal sheet, the third punch 23 and the third groove 33 cooperate with each other and the stretching gap between the two is 1 / 3 of the thickness of the ultra-thin metal sheet.

[0040] Specifically, in the prior art, see Figure 7 When the ultra-thin metal sheet forms a convex hull, the punch and the groove cooperate to form the convex hull in one stretch. Taking the ultra-thin metal sheet with a thickness of 0.15mm as an example, the stretching gap A is equal to the thickness of the ultra-thin metal sheet, and the stretching depth B can reach 0.45mm. During this one-time stretching process, the material at the stretched edge has a greater fluidity, resulting in stress concentration around the convex hull and unable to be released, causing the ultra-thin metal sheet with the convex hull to warp. The purpose of this embodiment is to prevent the ultra-thin metal sheet from warping after punching. Specifically, see Figures 1 to 6 In this embodiment, the same position of the ultra-thin metal sheet is punched successively by the first punch 21, the second punch 22, and the third punch 23. A plurality of top blocks 81 and springs 8 are respectively provided below the floating block 4. Taking the ultra-thin metal sheet with a thickness of 0.15 mm as an example, the groove depth of the third groove is 0.45 mm, the groove depth of the second groove is 0.35 mm, and the groove depth of the first groove is 0.25 mm. The first groove 31, the second groove 32, and the third groove 33 are all rectangular grooves, and the four top corners of the rectangular grooves are rounded. The first distance L1 and the second distance L2 are both 0.12 mm. Figure 6 (a), the first punch 21 and the first groove 31 cooperate to punch out the first convex bump 5, and the stretching gap A1 is equal to 1 / 3 of the thickness of the ultra-thin metal sheet, that is, the stretching gap A1 is 0.05mm, the stretching depth B1 is 0.25, and the stretching length C1 is 18.36mm; see Figure 6(b) The cross-sectional profile of the second punch 22 is equidistantly enlarged by a first distance L1 compared to the cross-sectional profile of the first punch 21. The second punch 22 and the second groove 32 cooperate to punch out the second convex bump 6. The stretching gap is 1 / 3 of the thickness of the ultra-thin metal sheet. The stretching depth B2 of the second convex bump 6 is 0.35, and the stretching length C2 is 18.60 mm. Figure 6 (c) The cross-sectional profile of the third punch 23 is equidistantly enlarged by a second distance L2 than the cross-sectional profile of the second punch 22. The third punch 23 and the third groove 33 cooperate to punch out the third bulge 7. The stretching gap is 1 / 3 of the thickness of the ultra-thin metal sheet. The stretching depth B3 of the third bulge 7 is 0.45, and the stretching length C3 is 18.84 mm. Through this embodiment, the forming size and depth of the bulge are gradually increased, and the stretching gap during each punching is 1 / 3 of the thickness of the ultra-thin metal sheet, that is, the stretching deformation each time is very small, and the material fluidity during punching is very small, so that stress concentration will not occur during the punching process, thereby avoiding warping of the ultra-thin metal sheet.

[0041] See also Figure 3 In order to further maintain the flatness of the ultra-thin metal sheet after punching, the punching device also includes a dotting component 9, which is a pitting punching device. The dotting component 9 includes an upper forming block 91 and a lower forming block 92. A plurality of first protrusions 911 are arranged at the bottom of the upper forming block 91, and a plurality of second protrusions 921 are arranged on the top of the lower forming block 92. The first protrusions 911 and the second protrusions 911 are arranged in coordination with each other. The ends of the first protrusions 911 and the second protrusions 911 are squares, and the side length of the square is 0.05 mm. Through the dotting component 9, a plurality of concave points can be formed on the surface of the ultra-thin metal sheet after punching, and the concave points are evenly distributed on the surface of the ultra-thin metal sheet in an array manner. It should be noted that concave points need to be formed on the surface of the ultra-thin metal sheet, including the convex positions, to further eliminate the stress of the ultra-thin metal sheet and maintain its flatness after stamping. Example 2

[0042] Ginseng Figure 4 and Figure 5 As shown, this embodiment discloses a specific implementation of an ultra-thin metal sheet.

[0043] This embodiment provides an ultra-thin metal sheet. Figure 5 and Figure 6As shown, it includes a metal sheet body 10 and at least one bulge 101 arranged on the metal sheet body; the stretching gap of the bulge 101 is 1 / 3 of the thickness of the ultra-thin metal sheet; the thickness of the ultra-thin metal sheet is 0.15mm-0.3mm. The bulge 101 of this embodiment is realized by the ultra-thin metal sheet stress-free punching device described in Example 1, and the method of gradually increasing the forming size and depth of the bulge is adopted, and the stretching gap during each punching is 1 / 3 of the thickness of the ultra-thin metal sheet, that is, each stretching deformation is very small, and the material fluidity during punching is very small, so that stress concentration will not occur during the punching process, thereby avoiding warping of the ultra-thin metal sheet.

[0044] The ultra-thin metal sheet of Example 2 uses the ultra-thin metal sheet stress-free punching device described in Example 1 to form at least one convex hump 101. For the parts that are the same as those in Example 1, please refer to Example 1 and will not be repeated here.

Claims

1. Ultra-thin metal sheet stress-free punching device, characterized in that: including an upper mold assembly and a lower mold assembly; A forming block is provided on the upper mold assembly, and a first groove, a second groove and a third groove are provided on the bottom of the forming block; The lower die assembly includes a floating block and a first punch, a second punch, and a third punch that rise and fall synchronously, wherein the cross-sectional profile of the second punch is equidistantly enlarged by a first distance compared to the cross-sectional profile of the first punch, and the cross-sectional profile of the third punch is equidistantly enlarged by a second distance compared to the cross-sectional profile of the second punch; The first distance is equal to the second distance; The first punch and the first groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet, the second punch and the second groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet, and the third punch and the third groove cooperate with each other and the stretching gap between them is 1 / 3 of the thickness of the ultra-thin metal sheet.

2. The stress-free punching device for ultra-thin metal sheets according to claim 1, characterized in that: The groove depth of the third groove is greater than the groove depth of the second groove and greater than the groove depth of the first groove.

3. The stress-free punching device for ultra-thin metal sheets according to claim 1, characterized in that: The groove depth of the third groove is 0.45 mm, the groove depth of the second groove is 0.35 mm, and the groove depth of the first groove is 0.25 mm.

4. The stress-free punching device for ultra-thin metal sheets according to any one of claims 1 to 3, characterized in that: The thickness of the ultra-thin metal sheet is 0.15mm-0.3mm.

5. The stress-free punching device for ultra-thin metal sheets according to claim 4, characterized in that: The first groove, the second groove and the third groove are all rectangular grooves, and the four top corners of the rectangular grooves are rounded corners.

6. The stress-free punching device for ultra-thin metal sheets according to claim 4, characterized in that: It also includes a dotting assembly, which includes an upper forming block and a lower forming block. A plurality of first protrusions are set on the bottom of the upper forming block, and a plurality of second protrusions are set on the top of the lower forming block. The first protrusions and the second protrusions are set in coordination.

7. The stress-free punching device for ultra-thin metal sheets according to claim 6, characterized in that: The ends of the first convex point and the second convex point are square, and the side length of the square is 0.05 mm.

8. The stress-free punching device for ultra-thin metal sheets according to claim 4, characterized in that: A plurality of top blocks and springs are respectively arranged below the floating block.

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