Patent ID: 7406851

Claim:
A die cushion controlling apparatus for controlling an operation of a cushion pad, comprising: a pad drive mechanism raising and lowering the cushion pad while applying an upward energizing force; a position measuring device measuring a position of the cushion pad; a load measuring device measuring a load generated in the cushion pad; a time detecting device detecting a generating time and a vanishing time of the load; and a controller controlling the pad drive mechanism, wherein the controller: performs a position control that controls the position of the cushion pad so that a position measured value follows a preset position pattern; performs a load control that controls the load generated in the cushion pad so that a load measured value follows a preset load pattern; switches from the position control to the load control step at a time when the time detecting device detects a generating time of the load; and switches from the load control to the position control step at a time when the time detecting device detects a vanishing time of the load.