Patent ID: 7765848
Filing Date: 2010-08-03
Classification: B21D,B30B

Abstract:
1. A press working method of working a press-formed product with a servo press, comprising: a press forming step of conducting press forming on a plate when a first die face of a first die is made to come close to a second die face of a second die to press form the plate, wherein the plate is disposed between the first die face and the second die face; a punch protruding step in which the first die is separated from the second die and the plate, and a movable punch is protruded from the first die face toward the second die face and locked to prevent relative movement between the movable punch and the first die; and an additional forming step in which the first die is again made to come close to the second die after the completion of the punch protruding step and the plate, which has already been pressed, is pressed by the first die and a portion of the plate is pushed and deformed by the movable punch.