DIE CUSHION DEVICE FOR PRESS MACHINE

WIPO Patent Application WO/2010/058710

A1

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.

JP2009095863	SERVO MOTOR DRIVEN PRESS
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JP2007014965	DIE CUSHION MECHANISM, AND CONTROLLER AND CONTROL METHOD THEREFOR

KOHNO, Yasuyuki (2-10 Ohyama-cho, Sagamihara-sh, Kanagawa 81, 〒2291181, JP)

JP2009/069036

May 27, 2010

November 09, 2009

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AIDA ENGINEERING, LTD. (2-10 Ohyama-cho, Sagamihara-shi Kanagawa, 81, 〒2291181, JP)
アイダエンジニアリング株式会社 (〒81 神奈川県相模原市大山町２番１０号 Kanagawa, 〒2291181, JP)

B21D24/02

MATSUURA, Kenzo (Matsuura & Associates, P.O. Box 176 Shinjuku Sumitomo Bldg. 39F, 6-1, Nishi-shinjuku 2-chome, Shinjuku-k, Tokyo 39, 〒1630239, JP)

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