Patent ID: 6016680
Filing Date: 2000-01-25
Classification: B21D

Abstract:
A silent die structure for drawing a plate comprising:a stationary punch;a cushion pin disposed in said stationary punch;a blank holder movably supported by said cushion pin and disposed adjacent to said stationary punch;a moveable die disposed adjacent to and opposing said stationary punch;a sub-blank holder disposed between said cushion pin and said blank holder;means for biasing said blank holder relative to said sub-blank holder;a run-up lever rotatably mounted to said sub-blank holder for pressing said blank holder towards said sub-blank holder prior to said moveable die contacting the plate disposed on said blank holder; andan operation cam driving said run-up lever being disposed on said moveable die at a location opposing said run-up lever, whereby a magnitude of noise generated when said moveable die contacts the plate, said blank holder, and said stationary punch is substantially reduced.