FIELD: process engineering.
SUBSTANCE: invention relates to automotive industry, particularly, to sheet-stamping used for making box-plan square parts with bottom bore. Flat sheet semi-finished workpiece with pre-punched hole is cut, bore size is smaller than that in finished part bottom. Drawing and flanging are combined to allow metal afterflow of flat sheet half-finished part and inner part deformation unless maximum permissible deformation at bore edges is reached. Then, allowance over bore edges and hardened material of flat sheet half-finished part edges are cut.
EFFECT: increased metal use ratio.
1 dwg
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