Control device for servo die cushion

Details Control device for servo die cushion Control device for servo die cushion

2006-06-22

2008-09-09

Banks, Derris H. (Department: 3725)

Metal deforming

With means to drive tool

Including screw-actuated tool support

C072S020100, C072S021400, C072S443000

Reexamination Certificate

active

07421878

ABSTRACT:
A control device of a die cushion mechanism, by which a force between a slide and a die cushion may follow a commanded value even in the rapid acceleration or deceleration of the slide and, moreover, a problem such as vibration of the mechanism may be prevented in the gradual acceleration or deceleration of the slide. The control device includes a slide position detecting part, such as a position sensor, for detecting the position of the slide and a correcting part for correcting a current commanded value using an acceleration of the slide, obtained by second-order differentiation of the position of the slide detected by the position sensor.

REFERENCES:
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patent: 5435166 (1995-07-01), Sunada
patent: 5477723 (1995-12-01), Kergen
patent: 2006/0169020 (2006-08-01), Takayama
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patent: 2003-205396 (2003-07-01), None
Japanese Notice of Reasons for Rejection mailed Oct. 30, 2007 in Japanese Application No. 2005-184933 (including a partial translation thereof).

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