Title:
油圧式加工機械、油圧式プレスブレーキおよびその制御方法
Document Type and Number:
Japanese Patent JP4916121
Kind Code:
B2
Abstract:
A hydraulic processing machine such as a hydraulic press brake and a shear capable of increasing energy efficiency by reducing the wasteful consumption of power and a method of controlling the processing machine and the press brake. The rotational speed of a pump motor (three-phase induction motor)(15) driving a hydraulic pump (14) is variably controlled by an inverter (24) to control the discharged flow rate of the hydraulic pump (14) to a minimum required for processing work. When a ram (1) is stationarily stopped at an upper limit position, the pump motor (15) is stopped. When the ram (1) is lowered from the upper limit position by its own weight, the pump motor (15) is rotated at the lowest rotational speed. When the ram (1) pressurizes a workpiece (5), the pump motor (15) is rotated at a minimum rotational speed. When the ram (1) is raised, the pump motor (15) is rotated at a maximum rotational speed.
Inventors:
Hiroyuki Kojima
Application Number:
JP2005086559A
Publication Date:
April 11, 2012
Filing Date:
March 24, 2005
Export Citation:
Assignee:
Komatsu Industries Corp.
International Classes:
B23Q5/26; B21D5/02; B23D15/14; B30B1/32; F15B11/00
Domestic Patent References:
| JP2003156005A | ||||
| JP2002066799A | ||||
| JP2000271651A | ||||
| JP2004066248A | ||||
| JP6323303A | ||||
| JP6071342A |
Attorney, Agent or Firm:
Wilfort International Patent Office