Patent ID: 8100052

Claim:
A method for a bottom dead center position correction for a press machine, the press machine including a bottom dead center position correction control section, the bottom dead center position correction control section performing position correction control that corrects an actual bottom dead center position of a slide to a target bottom dead center position while controlling rotation of an adjustment motor by utilizing target bottom dead center position data and bottom dead center position data detected during a press operation, the method comprising the steps of: determining, by a speed state determination section, whether an actual press speed is in a changing state or a stable state; setting, with a control cycle count setting section, a control multi-cycle count; selecting, with a mode selection control section, a control mode, comprising the steps of: selecting a single-cycle control mode when the actual press speed is in a changing state; and selecting a set multi-cycle control mode when the actual press speed is in a stable state; and performing, with the bottom dead center position correction control section, a position correction, comprising the steps of: performing position correction corresponding to each press cycle when the single-cycle control mode has been selected; and performing position correction corresponding to each multi-cycle count when the set multi-cycle control mode has been selected.