Title:
DIE CUSHION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/045300
Kind Code:
A1
Abstract:
A die cushion device comprising: a hydraulic cylinder (10) for moving a cushion pad (14) up and down; a hydraulic pump (P) for supplying hydraulic oil to the hydraulic cylinder (10) from an oil tank (T); a relief valve (20) for returning hydraulic oil discharged from the hydraulic cylinder (10) to the oil tank; a pressure sensor (PS) for detecting the pressure of the hydraulic oil, which is the die cushion pressure of the hydraulic cylinder (10); and a control device (40) for controlling the flow rate and pressure of the hydraulic oil supplied to the hydraulic cylinder (10) from the hydraulic pump (P). The control device (40) controls the rotation frequency of the hydraulic pump (P) such that the pressure of the hydraulic oil as detected by the pressure sensor (PS) reaches a die cushion pressure command value, and causes the hydraulic pump (P) to rotate in reverse when the pressure of the hydraulic oil as detected by the pressure sensor (PS) is equal to or greater than a set pressure of the relief valve (20).
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Inventors:
KANBAYASHI ATSUHIRO (JP)
NAKAMURA HIROKAZU (JP)
NAKAMURA HIROKAZU (JP)
Application Number:
PCT/JP2019/033114
Publication Date:
March 05, 2020
Filing Date:
August 23, 2019
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
B21D24/02; B30B15/02
Foreign References:
| JP2018069297A | 2018-05-10 | |||
| JP2006142312A | 2006-06-08 | |||
| US20080141668A1 | 2008-06-19 | |||
| JP2006142312A | 2006-06-08 |
Other References:
See also references of EP 3845324A4
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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