Controller for die cushion mechanism

Details Controller for die cushion mechanism Controller for die cushion mechanism

2006-05-23

2009-11-17

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With stabilizing features

C318S566000, C318S568220, C318S632000, C318S646000

Reexamination Certificate

active

07619384

ABSTRACT:
A controller for a die cushion mechanism includes: a spring element that is displaced according to force between the die cushion mechanism and a slide; a force instructor that instructs force; a force detector that detects force; and a speed instruction generator that generates a speed instruction of the servo motor, based on a force instruction value instructed by the force instructor and a force detection value detected by the force detector. The speed instruction generator generates the speed instruction by multiplying a force gain by a force difference determined from a difference between the force instruction value and the force detection value. The speed instruction generator changes the force gain, based on a spring constant corresponding value of the spring element determined from a force indicator that works between the slide and the die cushion.

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European Search Report mailed Mar. 18, 2009 issued in European Application No. 06010417.1.
Japanese Notice of Reasons for Rejection mailed Nov. 6, 2007 issued in Japanese Application No. 2005-150574 (including a partial translation thereof).

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