FIELD: sheet stamping. SUBSTANCE: method involves placing billet in die; pressing billet edge portion; forming billet central portion by punch and matrix. At the initial stages of forming, corrugations are made in billet edge portion protruding outside pressure surfaces of matrix and die pressure member. At the following stages of forming, corrugations are flattened when drawn between pressing surfaces of matrix and pressure member. Upon stretching of part corrugations make portion of ready part surface. In the process of flattening corrugations, required braking force resisting movement of billet edge is created. EFFECT: increased efficiency, improved quality of parts and reduced usage of material. 2 dwg
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