Lower die blank holder, drawing die, using method and drawing workpiece

Abstract

The invention relates to a lower die blank holder, a drawing die, a using method and a drawing workpiece. The lower die blank holder comprises a blank holder body, wherein the blank holder body is provided with a first process material pressing face, and the position of the first process material pressing face on the blank holder body corresponds to the corner position of a second process material pressing face of the drawing workpiece; and the first process material pressing face extends from the parting line of the blank holder body to the outer contour line of the blank holder body and forms a curved face, and the curved face is located on a spherical face. When the projection areas are equal, the actual area of the spherical surface is larger than the actual area of the plane, compared with a plane structure, when a plate flows along the spherical surface, the contraction line is lengthened, the flowing area of the plate is larger, the curved face is designed at the corner position, the problems of extrusion and accumulation of the plate at the corner position can be relieved and even solved, it is ensured that the plate at the corner position flows more uniformly in the forming process, the internal stress of the drawing workpiece is more uniform, and the defects that the corner position is wrinkled, and the molded surface of a product twists and rebounds are overcome.

Description

technical field [0001] The application relates to the technical field of stamping manufacturing, and in particular to a blank holder for a lower die, a drawing die, a method of use, and a drawing process part. Background technique [0002] In the development of complete automobiles, the market cycle of outer covering parts is short and the changes are more frequent, while the shape of outer covering parts of automobiles is complex, the size is large, the precision requirements are high, and the appearance quality requirements are strict. Important equipment in the manufacture of outer covers. [0003] Drawing is a stamping process that uses a drawing die to change a flat sheet into a designed shape, also known as stretching. Drawing can be made into simple, stepped and other complex shapes of thin-walled parts. [0004] The drawing die generally mainly includes a drawing upper die, a drawing lower die and a blank holder. The drawing upper die is used to enclose the drawin...

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present application provides a blank holder for the lower die, a drawing die, a method of use, and a drawing process part, so as to solve the problem of material flow at the corner of the drawing process part in the related art, which is more difficult and uneven, resulting in plate The primary and secondary strains in the material forming process are not uniform, resulting in the wrinkling of parts in the drawing process, the distortion and springback of the product surface, and other defects in various parts.

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