Press machine
AssigneeMurata Machinery, Ltd.
InventorsWataru Imaeda, Akinobu Watanabe
Life of this patent
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Abstract
A press machine includes a lifting mechanism that selectively lowers and lifts a die on a movable side. The lifting mechanism includes a motor driven lifting unit using a servomotor as a drive source thereof, and a hydraulically driven lifting unit using a hydraulic actuator as a drive source thereof. The lifting mechanism is controlled so as to enable the motor driven lifting unit to move the die on the movable side from a standby position to a drive system changeover position immediately before a press start position at which the die on the movable side starts contacting a workpiece to be processed and so as to enable the hydraulically driven lifting unit to move the die on the movable side from the drive system changeover position to a top dead center position.
Claims5
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.
Dependencies are inferred from the claim text.