COMPOUND SHAPE PART DRAWING DIE Russian patent published in 1998 - IPC

FIELD: plastic working of metals, in particular, drawing of shaped parts from metal sheets. SUBSTANCE: die has punch, matrix with opening and pressing member. Opening surface is provided with projections extending in parallel with opening axis. Projections have isosceles trapezium-shaped section, with larger end of trapezium adjoining to opening surface. Mating slots are made on punch side surface. Projections and slots provide braking of billet flange during deformation. Joining of matrix drawing edge in zone adjacent to projections with opening surface is selected in accordance with material and stamping parameters as well as part construction. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 5 cl, 8 dwg