WRINKLE GENERATION DETECTING DEVICE, DIE CUSHION DEVICE AND DIE PROTECTION DEVICE, AND WRINKLE GENERATION DETECTING METHOD, DIE CUSHION FORCE AUTOMATIC SETTING METHOD AND DIE PROTECTING METHOD

摘要

In a press machine having a die cushion device which supports a cushion pad and which generates a die cushion force when a slide of the press machine is lowered, the wrinkle generation detection device (550) includes: a slide position detector (114) which detects a height position of the slide; a cushion pad position detector (224) which detects a height position of the cushion pad; and a computing unit (554) which consecutively calculates a deviation between the height position of the slide detected by the slide position detector (1 14) and the height position of the cushion pad detected by the cushion pad position detector (224), during a time period from the start of forming of a material by the slide lowering to the end of the forming, wherein a wrinkle generated in the material is detected based on an increase of the deviation consecutively calculated by the computing unit (554).