Die protection apparatus for a hydraulic press

A die protection apparatus for a hydraulic press in which a slide is moved up and down by a hydraulic cylinder, the apparatus comprising:

• a slide position detection means for detecting a position of said slide;
• a pressure detection means for detecting a pressure that is applied to said slide;
• a setting means for setting a threshold value of said applied pressure and a predetermined position of said slide which are required to form a workpiece in accordance with a die used;
• and
• an emergency stop means which, if a working pressure develops that exceeds said threshold value at a position which is higher than said set slide position for a given die in a workpiece forming zone, is so operative as to determine said working pressure to be abnormal, thereby emergency stopping said slide.

A die protection apparatus for a hydraulic press in which a slide is moved up and down by a hydraulic cylinder, the apparatus comprising:

• a slide position detection means for detecting a position of said slide;
• a pressure detection means for detecting a pressure that is applied to said slide;
• a setting means for setting, for a given die used, an optimum slide position at which an abnormal load is not applied to said die;
• and
• an emergency stop means which, if said slide is lowered from said optimum position set by said setting means in a workpiece forming zone, is so operative as to determine this to be abnormal, thereby emergency stopping said slide.