A dense convex thin plate stamping die

Abstract

The utility model relates to a kind of intensive convex thin plate stamping die, including upper module and lower module, the lower surface of the upper module is high plane and low plane form echelon structure, the middle part of high plane and / or low plane is equipped with multiple fixed bumps, multiple depth independently adjustable bump punches are provided in the upper module, the bump punch is adjacent to the boundary line of the high plane and the low plane, the lower end of the bump punch protrudes from the lower surface of the upper module, the lower module is equipped with the recess respectively corresponding with the position of the bump punch and the fixed bump hole.The bump punch in the intensive convex thin plate stamping die is equivalent to a fixed bump in the function of stamping, the difference lies in that it has depth adjustment function, i.e. the distance of the end of the bump punch protruding from the lower surface of the upper module can be controlled.The final purpose of depth adjustment is to make the convex bundle punched out by bump punch after opening mold equal to the first convex bundle punched out by fixed bump.

Description

Technical Field

[0001] This utility model relates to the field of stamping technology, and in particular to a dense convex sheet stamping die. Background Technology

[0002] Figure 1 The diagram shows the top cover 1 of a heat exchanger box, which is a metal part stamped from a flat sheet. The top cover 1 has a base surface 11 and several raised surfaces 12, which are formed by protrusions from the center of the base surface 11. The base surface 11 has a large number of first protrusions 111 densely arranged, and the raised surfaces 12 have a large number of second protrusions 121 densely arranged. These protrusions are used to increase the heat exchange area and are relatively small in size.

[0003] In the dimensions required by the customer, all first protrusions 111 should be of equal height, and all second protrusions 121 should also be of equal height. However, in the actual mold design, the protrusion structure on the module designed according to the final dimensions cannot achieve equal height for the first protrusions 111 and the second protrusions 121. The reason is that during actual stamping, the material will always spring back, but the amount of springback of the material near the junction of the base surface 11 and the boss surface 12 is different from that of the material far from the junction. The height of the protrusions far from the junction is better able to meet the dimensional requirements, while the height of the protrusions near the junction will be shorter, causing the height error of the protrusions on the same surface to exceed the range. In addition, the sheet material used for stamping the upper cover plate 1 is also very thin (0.05mm), and the height of the protrusions reaches 3.5 times the thickness of the sheet material, which makes it easy for the protrusions on the mold to penetrate the protrusions.

[0004] Therefore, it is necessary to design a special mold to solve the above problems. Utility Model Content

[0005] The main purpose of this utility model is to provide a dense convex sheet stamping die that can manufacture dense convex sheets with high precision and high yield.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a dense convex sheet stamping die, comprising an upper module and a lower module, wherein the lower surface of the upper module is a stepped structure formed by a high plane and a low plane, and a plurality of fixed protrusions are provided in the middle of the high plane and / or the low plane, and a plurality of protrusion punches with independently adjustable depth are provided in the upper module, wherein the protrusion punches are adjacent to the boundary line between the high plane and the low plane, and the lower end of the protrusion punches protrudes from the lower surface of the upper module, and the lower module is provided with concave holes corresponding to the positions of the protrusion punches and the fixed protrusions respectively.

[0007] Specifically, the lower end of the protruding punch is a protruding part of a rotating body structure, the upper part of the protruding punch is a screw part, and the upper module is provided with multiple receiving holes. Each receiving hole is provided with a protruding punch and the receiving hole is provided with an internal thread that mates with the thread of the screw part.

[0008] Furthermore, each protruding punch has a nut threadedly fitted to its screw portion. When the lower surface of the nut contacts the upper surface of the upper module, the depth of the protruding punch relative to the upper module is fixed.

[0009] Furthermore, there is a height difference between the upper outlet surfaces of adjacent receiving holes, wherein the lower upper outlet surface is located in a countersunk hole, the depth of which is not less than the height of the nut.

[0010] Furthermore, the bottom center of the protrusion is a circular plane, and the bottom edge is an arc-shaped surface.

[0011] Furthermore, the diameter of the concave hole is larger than the outer diameter of the convex part, and the upper edge of the concave hole is rounded.

[0012] The beneficial effects of this utility model's technical solution are: In this densely packed embossed sheet metal stamping die, the embossed punch functions equivalent to a fixed emboss in stamping, the difference being its depth adjustment function. That is, the distance the end of the embossed punch protrudes beyond the lower surface of the upper module can be controlled. When the embossed punch protrudes a greater distance, the emboss punched onto the sheet metal will be higher; when the embossed punch protrudes a smaller distance, the emboss punched onto the sheet metal will be lower. The ultimate goal of depth adjustment is to ensure that the emboss punched by the embossed punch after die opening has the same height as the first emboss punched by the fixed emboss. Attached Figure Description

[0013] Figure 1 This is a top view of the top cover plate; Figure 2 A partial sectional view of a densely convex sheet metal stamping die near the boundary line between the base surface and the boss surface; Figure 3 This is a partial top view of the upper part of the upper module; Figure 4 To and Figure 3 A partial bottom view of the lower part of the upper module in relative position; Figure 5 This is a partial sectional view of the upper module; Figure 6 This is a partial sectional view of the lower module; Figure 7 This is a cross-sectional view of the punch with raised dots.

[0014] The diagram is marked as follows: 1-Top cover plate, 11-Basic surface, 111-First convex hull, 12-Boss surface, 121-Second convex hull; 2-Dense convex sheet metal stamping die, 21-Upper module, 211-High plane, 212-Low plane, 213-Fixed convex point, 214-Receiving hole, 2141-Internal thread, 2142-Counterhole, 22-Lower module, 221-Concave hole, 222-Round corner, 23-Convex punch, 231-Convexed part, 2311-Round plane, 2312-Arc surface, 232-Screw part, 24-Nut. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments.

[0016] Example: like Figures 1 to 7 As shown, a dense convex sheet stamping die 2 includes an upper module 21 and a lower module 22. The lower surface of the upper module 21 has a stepped structure formed by a high plane 211 and a low plane 212. The middle part of the low plane 212 (the part facing the base surface 11) is provided with multiple fixed protrusions 213. The upper module 21 is provided with multiple protrusion punches 23 whose depth can be independently adjusted. The protrusion punches 23 are adjacent to the boundary line between the high plane 211 and the low plane 212. The lower end of the protrusion punches 23 protrudes from the lower surface of the upper module 21 (located on the low plane 212 in the figure). The lower module 22 is provided with concave holes 221 that correspond to the positions of the protrusion punches 23 and the fixed protrusions 213 respectively.

[0017] The punch 23 is functionally equivalent to a fixed punch 213 in terms of stamping, but it has a depth adjustment function. That is, the distance by which the end of the punch 23 protrudes beyond the lower surface of the upper module 21 can be controlled. When the punch 23 protrudes a greater distance, the first protrusion 111 punched on the sheet metal will be higher; when the punch 23 protrudes a smaller distance, the first protrusion 111 punched on the sheet metal will be lower. The ultimate goal of depth adjustment is to ensure that the first protrusion 111 punched by the punch 23 after mold opening is equal in height to the first protrusion 111 punched by the fixed punch 213 (within the allowable error range). The recess 221 serves to avoid the first protrusion 111.

[0018] In practical applications, the fixed protrusion 213 can also be located in the middle of the high plane 211 (the part directly opposite the boss surface 12), and the protrusion punch 23 can be located on the side of the dividing line closer to the high plane 211; or the fixed protrusion 213 and the protrusion punch 23 can be located in both the high plane 211 and the low plane 212, with the protrusion punch 23 always closer to the dividing line than the fixed protrusion 213. If the protrusion punch 23 is stamping the boss surface 12, then the first protrusion 111 above it is replaced by the second protrusion 112.

[0019] like Figure 2 , Figure 5 and Figure 7 As shown, the lower end of the protruding punch 23 is a protruding part 231 of a rotating body structure, and the upper part of the protruding punch 23 is a screw part 232. The upper module 21 is provided with multiple receiving holes 214, each receiving hole 214 is provided with a protruding punch 23, and the receiving hole 213 is provided with an internal thread 2141 that is threadedly engaged with the screw part 232.

[0020] The protruding punch 23 controls the depth by the relative rotation of the screw part 232 and the internal thread 2141. Although the protrusion 231 will rotate, both the first protrusion 111 and the second protrusion 112 are rotating protrusion structures, so they will not be affected.

[0021] like Figure 2 and Figure 3 As shown, each protruding punch 23 has a screw portion 232 threadedly fitted with a nut 24. When the lower surface of the nut 24 contacts the upper surface of the upper module 21, the depth of the protruding punch 23 relative to the upper module 21 is fixed.

[0022] Although the engagement between the screw part 232 and the internal thread 2141 allows for arbitrary adjustment of the depth of the punch 23 within a certain range, the punch 23 is at risk of depth change when it is impacted during mold closing. Therefore, it is necessary to use the nut 24 to fix the angle of the adjusted punch 23. The method is to make it contact the upper surface of the upper module 21 and generate tangential resistance when tightening the nut 24.

[0023] like Figure 2 and Figure 4 As shown, there is a height difference between the upper outlet surfaces of adjacent receiving holes 214, wherein the lower upper outlet surface is located in a countersunk hole 2142, and the depth of the countersunk hole 2142 is not less than the height of the nut 24.

[0024] The countersunk hole 2142 here is considered part of the individual receiving hole 214, and its purpose is to allow adjacent nuts 24 to be staggered in height. Because the layout of the convex bulge restricts the spacing between adjacent convex punches 23, and the outer diameter of the nut 24 is always larger than the outer diameter of the convex punch 23, in order to avoid interference between adjacent nuts 24, the countersunk hole 2142 is used to allow adjacent nuts 24 that are too close in the horizontal direction to be staggered vertically, so that the depth of each convex punch 23 can be adjusted and fixed independently.

[0025] like Figure 7 As shown, the bottom center of the protrusion 231 is a circular plane 2311, and the bottom edge is an arc-shaped surface 2312.

[0026] The round plane 2311 can blunt the tip of the protrusion 231, and the arc-shaped surface 2312 can prevent the protrusion 231 from being sharp, thereby avoiding the sheet from being punched and torn, and ensuring the yield of stamping.

[0027] like Figure 2 , Figure 6 and Figure 7 As shown, the diameter of the concave hole 221 is larger than the outer diameter of the convex part 231, and the upper edge of the concave hole 221 is set as a rounded corner 222.

[0028] The rounded corners 222 prevent the lower template 22 from having sharp edges pressing against the edge of the convex hull, reducing the risk of tearing at the edge of the convex hull.

[0029] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A dense convex sheet metal stamping die, comprising an upper module and a lower module, characterized in that: The lower surface of the upper module is a stepped structure formed by a high plane and a low plane. Multiple fixed protrusions are provided in the middle of the high plane and / or the low plane. Multiple protrusion punches with independently adjustable depths are provided inside the upper module. The protrusion punches are adjacent to the boundary line between the high plane and the low plane. The lower end of the protrusion punches protrudes from the lower surface of the upper module. The lower module is provided with concave holes corresponding to the positions of the protrusion punches and the fixed protrusions.

2. The dense convex sheet stamping die according to claim 1, characterized in that: The lower end of the protruding punch is a protruding part of a rotating body structure, and the upper part of the protruding punch is a screw part. The upper module is provided with multiple receiving holes, each receiving hole is provided with a protruding punch, and the receiving hole is provided with an internal thread that mates with the screw part.

3. The dense convex sheet stamping die according to claim 2, characterized in that: Each protruding punch also has a nut threadedly fitted to its screw portion. When the lower surface of the nut contacts the upper surface of the upper module, the depth of the protruding punch relative to the upper module is fixed.

4. The dense convex sheet metal stamping die according to claim 3, characterized in that: There is a height difference between the upper outlet surfaces of adjacent receiving holes, wherein the lower upper outlet surface is located in a countersunk hole, the depth of which is not less than the height of the nut.

5. The dense convex sheet stamping die according to claim 2, characterized in that: The bottom center of the protrusion is a circular plane, and the bottom edge is an arc surface.

6. The dense convex sheet stamping die according to claim 2, characterized in that: The diameter of the concave hole is larger than the outer diameter of the convex part, and the upper edge of the concave hole is rounded.

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