METHOD AND APPARATUS FOR DEEP DRAWING OF HOLLOW SHEET PARTS Russian patent published in 1997 - IPC

FIELD: plastic metal working. SUBSTANCE: method of deep drawing of hollow sheet part is realized by means of pulsating efforts of punch acting upon blank. Flange of said blank is upset by pressure of holder and working fluid of supporting member. Process is performed at normalized values of working efforts. Apparatus for performing the method includes coaxially mounted holder and punch having hydraulic drive for reciprocating it, container, die, supporting member and knocking out member. Hydraulic drive of punch is pulsating one; working part of punch has rough cylindrical surface. Knocking out member in the form of floating piston is arranged in drawing hole of die. EFFECT: enhanced efficiency of method, improved design of apparatus. 3 cl, 7 dwg