FIELD: plastic metal working, namely, production of hollow parts from sheet blanks by drawing. SUBSTANCE: sheet blank embraced by ring made of flexible material is placed onto die and then with use of punch and holder central portion of blank is restricted. In that state blank flange is preliminarily upset to be deformed in radial direction with formation of thickened portion. Simultaneously, flexible ring is upset in axial direction. Then central portion of blank is released for acting to it by punch. Simultaneously flange of blank and flexible ring are upset between working surfaces of holder and die for reducing their thickness until predetermined value. EFFECT: enhanced efficiency. 6 dwg
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SU1750845A1 |
