Patent ID: 6810704
Filing Date: 2004-11-02
Classification: B30B

Abstract:
A press forming machine comprising:a lower support stand; an upper support plate held by a plurality of columns supported by the lower support stand; a slide plate which can reciprocate between the lower support stand and the upper support plate and has a molding space between the slide plate and the lower support stand; a plurality of servo motors; the servo motors having drive shafts engaged to an upper surface of the slide plate to make a displacement on the slide plate; and control means for controlling driving of each of the servo motors; the control means comprising: a memory which stores control data for each of the servo motors and for each of a plurality of operating steps during that a molding operation in which a load from a workpiece acts on the slide plate is divided into, the control data providing a displacement of each of the servo motors; the control data for each of the servo motors and for each of the plurality of operating steps including a correction amount corresponding to a change in load on the servo motor during each of the operating steps, and a driving means which, when a molding operation is performed where the load from a workpiece acts on the slide plate, supplies to each of the servo motors the control data stored in the memory for the servo motor and for each of a plurality of operating steps that the performed molding operation is divided into and separately drives the servo motors during each of the plurality of operating steps of the performed molding operation.