Title:
A hydraulic press brake
Document Type and Number:
Japanese Patent JP6061607
Kind Code:
B2
Abstract:
The pump discharge flow rate of a bidirectional piston pump (31) is set to a reference pump discharge flow rate Qa if the operation state of a lifting/lowering cylinders (15) is in a no-load state, and is set to a small-flow-rate pump discharge flow rate Qb that is smaller than the reference pump discharge flow rate Qa if the operation state of the lifting/lowering cylinders (15) is in a high-load state. The value Qb·Pb found by multiplying the pump discharge flow rate Qb and the pump discharge pressure Pb of the bidirectional piston pump (31) for when the operation state of the lifting/lowering cylinders (15) is in a high-load state is set substantially equal to or less than the value Qa·Pa found by multiplying the pump discharge flow rate Qa and the discharge pressure Pa of the bidirectional piston pump (31) for when the operation state of the lifting/lowering cylinders (15) is in a no-load state.
Inventors:
Tomohiro Yukida
Akira Nakamura
Takanori Okubo
Akira Nakamura
Takanori Okubo
Application Number:
JP2012229758A
Publication Date:
January 18, 2017
Filing Date:
October 17, 2012
Export Citation:
Assignee:
Amada Holdings Co., Ltd.
International Classes:
B21D5/02; B30B1/32; B30B15/22
Domestic Patent References:
| JP2001263254A | ||||
| JP2002239636A | ||||
| JP2001137948A | ||||
| JP2007138894A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Iwa Saki Kokuni
Shunichi Takahashi
Masakazu Ito
Toshio Takamatsu
Iwa Saki Kokuni
Shunichi Takahashi
Masakazu Ito
Toshio Takamatsu