Control device for servo die cushion

摘要

A control device (10), for a servo die cushion, by which the speed of a die cushion (3) is prevented from largely deviating from the speed of a slide (2), whereby the press force between the slide (2) and the die cushion (3) is not significantly reduced. The control device (10) includes a slide speed detector (14) for detecting the speed of the slide, a die cushion speed detector (16) for detecting the speed of the die cushion, and a die cushion speed commanding part (18) for controlling the speed of the die cushion. When a tentative speed command of the die cushion is largely deviated from the detected slide speed, the command of the die cushion is corrected such that the absolute value thereof does not exceed the value calculated by adding the absolute value of the detected slide speed to a positive constant.