Patent attributes
A die-cushion controlling device includes: a position-command-signal outputting section for outputting a position command signal of a die-cushion pad; a position detecting means for detecting a position of the die-cushion pad; a position comparing section for outputting a position deviation signal corresponding to a deviation between the target position value based on the position command signal and a position detection value based on a position detection signal; a position controlling section for outputting a position-speed command signal based on the position deviation signal; a speed controlling section for outputting a motor-current command signal based on the position-speed command signal from the position controlling section; a servo amplifier for generating a current corresponding to the motor-current command signal; and an output switching section that, based on a press signal output when a slide has reached a bottom dead center, switches the position detection signal from the position detection means to the position command signal from the position command signal outputting section.
