Title:
DIE-CUSHION DEVICE AND PRESS MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/137032
Kind Code:
A1
Abstract:
A die-cushion device (200) is provided with: a double-acting hydraulic cylinder (210) which vertically moves a cushion pad (140); a first hydraulic pump (P1) which supplies a first port (210a) of the hydraulic cylinder (210) with an operating oil from an oil tank (T) to drive a piston (212) of the hydraulic cylinder (210) upward; a second hydraulic pump (P2) which supplies a second port (210b) of the hydraulic cylinder (210) with the operating oil from the oil tank (T) to drive the piston (212) of the hydraulic cylinder (210) downward; and a control unit (260) which controls the rotational speeds of the first and second hydraulic pumps (P1, P2) to control the flow rate and the pressure of the operating oil that is supplied from the first and second hydraulic pumps (P1, P2) to the hydraulic cylinder (210).
Inventors:
KANBAYASHI ATSUHIRO (JP)
NAKAMURA HIROKAZU (JP)
NAKAMURA HIROKAZU (JP)
Application Number:
PCT/JP2019/036506
Publication Date:
July 02, 2020
Filing Date:
September 18, 2019
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
B21D24/02; B30B15/00; B30B15/02
Domestic Patent References:
| WO2010058710A1 | 2010-05-27 |
Foreign References:
| US20140090441A1 | 2014-04-03 | |||
| JPS63273524A | 1988-11-10 | |||
| US20160271675A1 | 2016-09-22 | |||
| JP2007075846A | 2007-03-29 |
Other References:
See also references of EP 3885058A4
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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