Title:
ダイクッション装置
Document Type and Number:
Japanese Patent JP7419224
Kind Code:
B2
Abstract:
The die cushion device includes a first hydraulic cylinder 120 for supporting a cushion pad 110, and a first hydraulic circuit 140-1 for driving the first hydraulic cylinder 120. The first hydraulic circuit 140-1 is a hydraulic closed circuit including a logic valve 148 connected between a die cushion pressure generation line 142 and a system pressure line 144, and a hydraulic pump (HP) driven by a first servomotor (SM1) for applying a pilot pressure to the logic valve 148. The first controller controls the first servomotor (pilot pressure) based on a first pressure command corresponding to the die cushion force and the pressure detected by the first pressure detector 143 to control the pressure in a lower chamber 120A of the first hydraulic cylinder 120 so that the pressure is equal to a pressure corresponding to the first pressure command.
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Inventors:
Tadahiro Kondo
Application Number:
JP2020216637A
Publication Date:
January 22, 2024
Filing Date:
December 25, 2020
Export Citation:
Assignee:
AIDA ENGINEERING CO., LTD.
International Classes:
B21D24/02; B30B15/02; B30B15/14
Domestic Patent References:
| JP2016000407A | ||||
| JP61205619U | ||||
| JP2017113786A | ||||
| JP2014140871A | ||||
| JP7024600A |
Foreign References:
| US20160271675 |
Attorney, Agent or Firm:
Kenzo Matsuura