Technique for squeezing through-hole high dummy club on sheet

Abstract

The invention relates to a process to extrude a high lug boss in a through hole of a sheet metal, in particular to a process to extrude a high lug boss in a through hole of a sheet metal through cold extrusion, wherein, the height of the lug boss is greater than the thickness of the sheet metal. The technology of the invention adopts a fine blanking machine, which is not stressed uniformly in three directions, to directly cold squeeze the sheet metal, thus improving the plasticity of the metal, impeding the intergranular deformation of materials and changing intergranular deformation into intragranular deformation; the tensile stress can be greatly inhibited, thus preventing the emergence and expansion of cracks and further avoiding the problem of large displacement in the prior art, which causes excess tensile force, easy breaking and tension fracture of the lug boss, etc.

Description

The Technology of Sheet Metal Extrusion Through Hole and High Boss technical field The invention relates to a process for extruding a through-hole high boss on a thick plate, in particular to a process for cold-extruding a through-hole high boss on a thick plate, and the height of the boss is greater than the thickness of the plate. Background technique Cold extrusion is suitable for processing parts such as automobiles and door locks. It is characterized by fewer processes, short working hours, and rapid prototyping. The traditional process of stamping through-hole bosses uses pre-punching process holes, and then uses conical guide punches. Extrusion turning hole, the mold structure is simple, and can be implemented on a general press. However, when punching through the high boss of the hole, that is, when the height of the boss to be punched out is greater than the thickness of the sheet, the above process will cause the tensile stress of the material to be too large in ...

AI Technical Summary

Problems solved by technology

However, when punching through the high boss of the hole, that is, when the height of the boss to be punched out is greater than the thickness of the sheet, the above process will cause the tensile stress of the material to be too large in the process of turning the hole, so that the material is required to have good ductility and convexity. Only products with low platform requirements and low precision requirements can be suitable; for products with high size requirements, high strength, thick materials, and bosses higher than the thickness of the material, it is difficult to achieve using conventional stamping processes, usually with pre-punching Products made by hole technology will have cracks, breakage in the middle, and uneven cross-section

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