Title:
DIE CUSHION DEVICE FOR PRESS MACHINE
Document Type and Number:
WIPO Patent Application WO/2010/058710
Kind Code:
A1
Abstract:
A die cushion device for a press machine, provided with a hydraulic cylinder (3) for supporting a cushion pad (2) and generating die cushion pressure when a slide of the press machine descends, a proportional valve (10) and a hydraulic pump/motor (4) which are individually connected in parallel between the lower chamber of the hydraulic cylinder (3) and a low-pressure source (6), an electric motor (5) connected to the rotating shaft of the hydraulic pump/motor (4), a die cushion pressure commander (60) for outputting a predetermined die cushion pressure command, a pressure detector (21a) for detecting the pressure in the lower chamber of the hydraulic cylinder (3), and a controller (70) for controlling, on the basis of the die cushion pressure command and the pressure detected by the pressure detector (21a), the degree of opening of the proportional valve (10) and the torque of the electric motor (5) so that the die cushion pressure reaches a level corresponding to the die cushion pressure command.
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Inventors:
KOHNO YASUYUKI (JP)
Application Number:
PCT/JP2009/069036
Publication Date:
May 27, 2010
Filing Date:
November 09, 2009
Export Citation:
Assignee:
AIDA ENG LTD (JP)
KOHNO YASUYUKI (JP)
KOHNO YASUYUKI (JP)
International Classes:
B21D24/02
Foreign References:
| JP2007507349A | 2007-03-29 | |||
| JP2006315074A | 2006-11-24 | |||
| JPS6454919U | 1989-04-05 | |||
| JPH03133599A | 1991-06-06 | |||
| JPH06335947A | 1994-12-06 |
Other References:
See also references of EP 2377629A4
None
None
Attorney, Agent or Firm:
MATSUURA, Kenzo (JP)
Kenzo Matsuura (JP)
Kenzo Matsuura (JP)
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