DIE FOR MAKING SPHERICAL, ELLIPTICAL AND OTHER CUPOLA-SHAPED BOTTOMS Russian patent published in 1994 - IPC

FIELD: plastic metal working. SUBSTANCE: die has a plunger die, clamping ring with clamping pins, a set of drawing ring matrices, a die stock and a yoke. Latches freely moving along the pin mounted in the die stock are placed in the turnings of the lateral surfaces of the clamping ring and the matrix (except the first one). In dependence of the stretching transition the latches are placed in the turnings of one of the matrices or the clamping ring. EFFECT: enhanced quality of bottoms and reduced labour intensity of the die readjustment. 1 dwg