Warm or hot before backward co-extruded high speed die forging method and apparatus

摘要

PROBLEM TO BE SOLVED: To provide a high speed forging method and device in which the longitudinally simultaneous extrusion is substantially performed, the metal flow is excellent and no flaws are generated, and ring-shaped parts of stable quality can be efficiently formed with excellent accuracy at high speed of ≥80 slide strokes per minute. ;SOLUTION: A die 2 having a rearwardly projected part 3, a work 7 to be heated, and a punch 4 having a forwardly projected part 5 are arranged in a container 1 of a die forging device in the order from the forward part in the extrusion direction, a withdrawal type die 6 is arranged between the container 1 and the work 7, the die 2 and the punch 4, the forwardly installed die 2 is fixed to set the die speed VD to be zero, the punch speed VP is set twice as the withdrawal type die speed VWD, the stroke length of the withdrawal type die 6 is ≥1/2 of the forward extrusion length of a product, and a ring- shaped stock symmetrical to the center is formed through warm or hot longitudinally simultaneous extrusion die forging to press the punch in the die direction.;COPYRIGHT: (C)1998,JPO