Thick plate close-distance double-convex-hull stamping process

Abstract

The invention discloses a thick plate close-distance double-convex-hull stamping process which can well solve the problem that the size precision of small-specification convex hulls machined by thick plates is not easy to reach the standard through segmented machining, forming of larger convex hulls in advance, stamping, protruding and storing of materials in advance and gradual reduction of the convex hulls to a set size range through multiple procedures. The machining precision is guaranteed, meanwhile, product cracking is avoided, and the yield of products is greatly improved.

Description

Technical Field

[0001] The invention relates to a booster stamping technology, in particular to a thick plate close-range double convex hull stamping process. Background Art

[0002] To meet the strength requirement, the booster housing is stamped from 3mm thick S550MC sheet. A pair of sensor mounting convex bumps are arranged on the connecting plane of the booster housing. The thick sheet makes the convex bumps difficult to process and the adjacent parts are prone to tearing. Figure 1 The booster housing shown in the figure has a side distance of only 17.5mm between the two convex bulges on the finished product, while the height of the bulge is 5.2mm. As the thickness of the sheet material is as high as 3mm, it is difficult to ensure the forming accuracy during the bulge forming process, and the product is very easy to tear, resulting in an extremely low yield rate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a close-pitch double convex hull punching process for thick plates with a high yield rate.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a thick plate close-range double convex hull stamping process, comprising the following steps:

[0005] Step 1: Use a primary stamping die to punch two first convex humps on the plate, the distance between the central axes of the two first convex humps is equal to the distance between the central axes of the two finished convex humps, the opening diameter of the first convex humps is more than twice the outer diameter of the finished convex humps, the height of the first convex humps is more than 1.5mm greater than the finished convex humps, the radius of the flattened portion of the top surface of the first convex humps is not less than the radius of the flattened portion of the top surface of the finished convex humps, and the radius of the fillet of the top surface of the first convex humps is not less than 3.5mm; the side surface of the first convex humps is formed by the connection of the upper arc chamfer and the lower arc chamfer;

[0006] Step 2: using two stamping dies to reduce the height of the first convex hull, reduce the radius of the upper arc chamfer, and maintain the radius of the lower arc chamfer, so that the top surface of the obtained second convex hull becomes wider, the opening is reduced, and the distance between the central axes of the two second convex hulls is equal to the distance between the central axes of the two finished convex hulls;

[0007] Step 3: Use a third stamping die to further reduce the height of the second convex bulge, further reduce the radius of the upper arc chamfer angle and the lower arc chamfer angle, maintain the angle between the side surface and the horizontal plane, reduce the opening of the second convex bulge so that the distance between the side walls of the two third convex bulges after forming is further increased, and the distance between the central axes of the two third convex bulges is equal to the distance between the central axes of the two finished convex bulges;

[0008] Step 4, shrinking and stamping the third convex bulge so that the side surface of the convex bulge is perpendicular to the bottom plate, and the height of the convex bulge is controlled within a range of no more than 0.3 mm more than the height of the finished convex bulge, and at the same time, the upper part of the formed convex bulge reaches the size of the finished convex bulge, including the radius of the flat part of the top surface of the convex bulge reaches the radius of the flat part of the top surface of the finished convex bulge and the upper chamfer radius reaches the upper chamfer radius of the finished convex bulge, and the lower chamfer radius is further reduced, and finally the side distance of the two formed fourth convex bulges is formed to the distance of the finished convex bulge, and the distance between the central axes of the two fourth convex bulges is equal to the distance between the central axes of the two finished convex bulges;

[0009] Step 5: shaping the fourth convex hull so that its convex hull height is further reduced and the lower chamfer radius is further reduced, thereby forming a finished convex hull. The beneficial effect of the present invention is that the processing technology can better solve the problem that the dimensional accuracy of small-sized convex hulls in thick plate processing is difficult to meet the standard by first forming a larger convex hull, first stamping the material into a convex storage material, and then gradually reducing the convex hull to a set size range through multiple processes, which not only ensures the processing accuracy, but also avoids product cracking, and greatly improves the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The structure of the booster housing to which the convex hump processed in the embodiment belongs.

[0011] Figure 2 It is the convex hull cross section after stamping by the initial stamping die.

[0012] Figure 3 It is the convex hull cross section after stamping by two stamping dies.

[0013] Figure 4 It is the convex hull cross section after being punched by the third punching die.

[0014] Figure 5 It is the fourth convex hull cross-sectional structure.

[0015] Figure 6 It is the finished product convex hull cross-section structure. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 2-6 As shown, a thick plate close-pitch double convex hull stamping process comprises the following steps:

[0018] Step 1: Use a primary stamping die to punch two first convex humps on the plate. The distance between the central axes of the two first convex humps is equal to the distance between the central axes of the two finished convex humps. The opening diameter of the first convex humps is more than twice the outer diameter of the finished convex humps. The height of the first convex humps is 1.7mm greater than the finished convex humps. The radius of the flattened portion of the top surface of the first convex humps is not less than the radius of the flattened portion of the top surface of the finished convex humps. The radius of the fillet of the top surface of the first convex humps is 4mm; the side surface of the first convex humps is formed by connecting the upper arc chamfer and the lower arc chamfer;

[0019] Step 2: using two stamping dies to reduce the height of the first convex hull, reduce the radius of the upper arc chamfer, and maintain the radius of the lower arc chamfer, so that the top surface of the obtained second convex hull becomes wider, the opening is reduced, and the distance between the central axes of the two second convex hulls is equal to the distance between the central axes of the two finished convex hulls;

[0020] Step 3: Use a third stamping die to further reduce the height of the second convex bulge, further reduce the radius of the upper arc chamfer angle and the lower arc chamfer angle, maintain the angle between the side surface and the horizontal plane, reduce the opening of the second convex bulge so that the distance between the side walls of the two third convex bulges after forming is further increased, and the distance between the central axes of the two third convex bulges is equal to the distance between the central axes of the two finished convex bulges;

[0021] Step 4: shrink and stamp the third convex bulge so that the side surface of the convex bulge is perpendicular to the bottom plate, and the height of the convex bulge is controlled to be 0.1 mm higher than the height of the finished convex bulge. At the same time, the upper part of the formed convex bulge reaches the size of the finished convex bulge, including the radius of the flat part of the top surface of the convex bulge reaches the radius of the flat part of the top surface of the finished convex bulge and the upper chamfer radius reaches the upper chamfer radius of the finished convex bulge, and the lower chamfer radius is further reduced, and finally the side distance of the two formed fourth convex bulges is formed to the distance of the finished convex bulge, and the distance between the central axes of the two fourth convex bulges is equal to the distance between the central axes of the two finished convex bulges;

[0022] Step 5: shaping the fourth convex hull so that its convex hull height is further reduced and the lower chamfer radius is further reduced, thereby forming a finished convex hull.

[0023] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A thick plate close-pitch double convex hull stamping process, comprising the following steps: Step 1: Use a primary stamping die to punch two first convex humps on the plate, the distance between the central axes of the two first convex humps is equal to the distance between the central axes of the two finished convex humps, the opening diameter of the first convex humps is more than twice the outer diameter of the finished convex humps, the height of the first convex humps is more than 1.5mm greater than the finished convex humps, the radius of the flattened portion of the top surface of the first convex humps is not less than the radius of the flattened portion of the top surface of the finished convex humps, and the radius of the fillet of the top surface of the first convex humps is not less than 3.5mm; the side surface of the first convex humps is formed by the connection of the upper arc chamfer and the lower arc chamfer; Step 2: using two stamping dies to reduce the height of the first convex hull, so that the top surface of the obtained second convex hull becomes wider, the opening is reduced, and the distance between the central axes of the two second convex hulls is equal to the distance between the central axes of the two finished convex hulls; Step 3: Use a third stamping die to further reduce the height of the second convex bulge, reduce the opening of the second convex bulge, so that the distance between the side walls of the two third convex bulges after forming is further increased, and the distance between the central axes of the two third convex bulges is equal to the distance between the central axes of the two finished convex bulges; Step 4, shrinking and stamping the third convex bulge so that the side surface of the convex bulge is perpendicular to the bottom plate, and the height of the convex bulge is controlled within a range of no more than 0.3 mm more than the height of the finished convex bulge, and at the same time, the upper part of the formed convex bulge reaches the size of the finished convex bulge, including the radius of the flat part of the top surface of the convex bulge reaches the radius of the flat part of the top surface of the finished convex bulge and the upper chamfer radius reaches the upper chamfer radius of the finished convex bulge, and the lower chamfer radius is reduced, and finally the side distance of the two formed fourth convex bulges is formed to the distance of the finished convex bulge, and the distance between the central axes of the two fourth convex bulges is equal to the distance between the central axes of the two finished convex bulges; Step 5: shaping the fourth convex hull so that its convex hull height is further reduced and the lower chamfer radius is further reduced, thereby forming a finished convex hull.

2. A thick plate close-pitch double convex hull stamping process as claimed in claim 1, characterized in that: During the processing of step 2, the radius of the upper arc chamfer is reduced.

3. A thick plate close-spaced double convex hull stamping process as claimed in claim 1, characterized in that: During the processing of step 2, the radius of the lower arc chamfer is maintained.

4. A thick plate close-pitch double convex hull stamping process as claimed in any one of claims 1 to 3, characterized in that: During the processing in step three, the radii of the upper arc chamfer angle and the lower arc chamfer angle are further reduced.

5. A thick plate close-pitch double convex hull stamping process as claimed in any one of claims 1 to 3, characterized in that: During the processing in step three, the angle between the side surface and the horizontal plane is maintained.

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