Press die cushion controller

Details Press die cushion controller Press die cushion controller

2007-03-02

2011-10-25

Sullivan, Debra (Department: 3725)

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

C072S016100, C072S351000

Reexamination Certificate

active

08042375

ABSTRACT:
A die-cushion controlling device includes: a position-command-signal outputting section for outputting a position command signal of a die-cushion pad; a position detecting means for detecting a position of the die-cushion pad; a position comparing section for outputting a position deviation signal corresponding to a deviation between the target position value based on the position command signal and a position detection value based on a position detection signal; a position controlling section for outputting a position-speed command signal based on the position deviation signal; a speed controlling section for outputting a motor-current command signal based on the position-speed command signal from the position controlling section; a servo amplifier for generating a current corresponding to the motor-current command signal; and an output switching section that, based on a press signal output when a slide has reached a bottom dead center, switches the position detection signal from the position detection means to the position command signal from the position command signal outputting section.

REFERENCES:
patent: 2005/0274243 (2005-12-01), Shiroza et al.
patent: 2006/0012326 (2006-01-01), Iwashita et al.
patent: 2007/0006632 (2007-01-01), Iwashita et al.
patent: 2009/0025444 (2009-01-01), Suzuki
patent: 1 741 500 (2007-01-01), None
patent: 10-192997 (1998-07-01), None
patent: 10-202327 (1998-08-01), None
patent: 2006-7296 (2006-01-01), None
patent: 2006-26738 (2006-02-01), None
International Preliminary Report on Patentability issued in Serial No. PCT/JP2007/054026 dated Oct. 21, 2008.
Translation of the Written Opinion of the International Searching Authority issued in Serial No. PCT/JP2007/054026.
U.S. Appl. No. 11/908,485; First Named Inventor: Yuichi Suzuki; Title: “Die Cushion Control Device”; filed Sep. 12, 2007.

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