Patent ID: 9138794
Filing Date: 2015-09-22
Classification: B21D,B30B

Abstract:
1. A press machine comprising: a main body frame; a die on a stationary side which is held in position in a fixed state relative to the main body frame; a die on a movable side, which is movable up and down between a standby position distant from the stationary die and a bottom dead center position adjacent the stationary die; a lifting mechanism to drive the movable die, the lifting mechanism including a motor driven lifting unit including a servomotor as a drive source therefor, and a hydraulically driven lifting unit including a hydraulic actuator as a drive source therefor; and a control device programmed to control the lifting mechanism; wherein the control device is programmed to control the lifting mechanism so that the movable die is driven by the motor driven lifting unit from the standby position to a drive system changeover position immediately preceding a press start position at which the movable die starts contacting a workpiece to be processed, and the movable die is driven by the hydraulically driven lifting unit from the drive system changeover position to the bottom dead center position.