METHOD AND TOOL FOR BACK PRESSING Russian patent published in 1995 - IPC

FIELD: metals pressure working. SUBSTANCE: back pressing method provides for blank pressing out of container, separation of press-remainder by cutter and die together with punch returning through container to initial position. Tool for back pressing has container and punch with mounted on the punch end combined die, peripheral part of which is coaxial with inner part with forming canal and contacts container. After separation of press-remainder, peripheral part of die is moved out of container and it is being moved beyond limits of container in initial position. Container is moved, releasing zone for ingot set. In the case, inner part of die together with punch is passing through container. Ingot is set in container, then using transportation mean peripheral part of die is set on axis of press. Punch with inner part of die is shifted over the peripheral part of die and then die is set in container. In the case both parts of die are mated along conical surface. EFFECT: method and tool for back pressing increased productivity of metal working by hydraulic press. 3 cl, 2 dwg