Die cushion device of press machine

Patent metadata

Field	Value
Publication number	US-2016354828-A1
Application number	US-201615158049-A
Country	US
Kind code	A1
Filing date	May 18, 2016
Priority date	Jun 3, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A die cushion device of a press machine includes: a plurality of cushion pads; a plurality of die cushion force generators that supports the plurality of respective cushion pads, and that is capable of independently moving up and down the plurality of respective cushion pads as well as independently generating die cushion force for each of the cushion pads; and a die cushion controller that controls the plurality of die cushion force generators to independently move up and down the plurality of respective cushion pads as well as to independently generate die cushion force for each of the cushion pads.

First claim

What is claimed is:

1 . A die cushion device of a press machine comprising:
a plurality of cushion pads; a plurality of die cushion force generators that supports the plurality of respective cushion pads, and that is capable of independently moving up and down the plurality of respective cushion pads as well as independently generating die cushion force for each of the cushion pads; and a die cushion controller that controls the plurality of die cushion force generators to independently move up and down the plurality of respective cushion pads as well as to independently generate die cushion force for each of the cushion pads.

2 . The die cushion device of a press machine according to claim 1 ,
wherein the plurality of cushion pads has a common die cushion stroke, and wherein the die cushion controller includes only one die cushion controller to control the plurality of respective cushion pads as one cushion pad.

3 . The die cushion device of a press machine according to claim 2 , further comprising:
a plurality of cushion pad position detectors that detects cushion pad positions of the plurality of respective cushion pads, wherein the die cushion controller includes a die cushion position controller that includes a die cushion position commanding device that outputs a common die cushion position command, and a plurality of position control compensators that controls the plurality of respective die cushion force generators to independently move up and down each of the plurality of cushion pads, on the basis of the common die cushion position command outputted from the die cushion position commanding device, and cushion pad positions detected by the plurality of respective cushion pad position detectors.

4 . The die cushion device of a press machine according to claim 3 ,
wherein two or more of the die cushion force generators are arranged for each of the plurality of cushion pads, wherein the plurality of cushion pad position detectors corresponding to the plurality of respective die cushion force generators is provided to detect each of positions of two or more of the die cushion force generators, arranged for each of the plurality of cushion pads, or detect a die cushion position near each of the positions, and wherein the plurality of position control compensators corresponding to the plurality of respective die cushion force generators is provided to control the plurality of respective die cushion force generators to independently move up and down each of the plurality of cushion pads, on the basis of the common die cushion position command outputted from the die cushion position commanding device, and a die cushion position detected by a corresponding cushion pad position detector in the plurality of cushion pad position detectors.

5 . The die cushion device of a press machine according to claim 2 , further comprising:
a plurality of die cushion force detectors that detects corresponding die cushion force applied to the plurality of cushion pads from the plurality of respective die cushion force generators, wherein the die cushion controller includes a die cushion force controller that includes a die cushion force commanding device that outputs a common die cushion force command or an individual die cushion force command corresponding to each of the plurality of cushion pads, to the plurality of die cushion force generators, and a die cushion force control compensator that controls each of the plurality of die cushion force generators to apply independent die cushion force to each of the plurality of cushion pads, on the basis of the common die cushion force command or the individual die cushion force command, outputted from the die cushion force commanding device, and die cushion force detected by each of the plurality of die cushion force detectors.

6 . The die cushion device of a press machine according to claim 5 ,
wherein two or more of the die cushion force generators are arranged in each of the plurality of cushion pads, wherein the plurality of die cushion force detectors corresponding to the plurality of respective die cushion force generators is provided to detect each die cushion force applied to the plurality of cushion pads from the plurality of respective die cushion force generators, and wherein the plurality of die cushion force control compensators controls the plurality of respective die cushion force generators to apply independent die cushion force to the plurality of respective cushion pads, on the basis of a common die cushion force command or an individual die cushion force command, outputted from the die cushion force commanding device, and die cushion force detected by each of the plurality of die cushion force detectors.

7 . The die cushion device of a press machine according to claim 6 ,
wherein the die cushion force commanding device is capable of setting a die cushion force command common to the plurality of die cushion force generators, a die cushion force command common to two or more of the die cushion force generators arranged in each of the cushion pads, or an individual die cushion force command for each of two or more of the die cushion force generators arranged in each of the cushion pads, and outputs the set die cushion force command

8 . The die cushion device of a press machine according to claim 1 ,
wherein the plurality of cushion pads has an individual die cushion stroke, and wherein the die cushion controller includes a plurality of die cushion controllers that controls the plurality of respective cushion pads, and the plurality of die cushion controllers controls the plurality of respective cushion pads.

9 . The die cushion device of a press machine according to claim 8 , further comprising:
a plurality of cushion pad position detectors that detects positions of the plurality of respective cushion pads, wherein each of the plurality of die cushion controllers includes a die cushion position controller that includes a die cushion position commanding device that outputs an individual die cushion position command corresponding to each of the plurality of cushion pads, and a position control compensator that controls a corresponding die cushion force generator in the plurality of die cushion force generators to independently move up and down a corresponding cushion pad in the plurality of cushion pads, on the basis of a die cushion position command outputted from the die cushion position commanding device, and a position of a cushion pad, detected by a corresponding cushion pad position detector in the plurality of cushion pads position detector.

10 . The die cushion device of a press machine according to claim 9 ,
wherein two or more of the die cushion force generators are arranged for each of the plurality of cushion pads, wherein the plurality of cushion pad position detectors corresponding to the plurality of respective die cushion force generators is provided to detect each of positions of two or more of the die cushion force generators, arranged for each of the plurality of cushion pads, or a die cushion position near each of the positions, and wherein the plurality of position control compensators corresponding to the plurality of respective die cushion force generators is provided to control each of the plurality of die cushion force generators to independently move up and down each of the plurality of cushion pads, on the basis of an individual die cushion position command corresponding to each of the plurality of cushion pads, outputted from the die cushion position commanding device, and a die cushion position detected by a corresponding cushion pad position detector in the plurality of cushion pad position detectors.

Assignees

• Aida Eng Ltd

Inventors

• Kohno Yasuyuki

Classifications

• B21D24/14 Primary

  pneumatically or hydraulically · CPC title

• B30B15/02 Primary

  Dies; Inserts therefor; Mounting thereof; Moulds (extrusion dies B30B11/22) · CPC title

• B30B15/28

  Arrangements for preventing distortion of, or damage to, presses or parts thereof · CPC title

• B21D24/02 Primary

  Die-cushions · CPC title

• B21D24/10

  Devices controlling or operating blank holders independently, or in conjunction with dies · CPC title