Method and device for controlling the stroke of a press machine

Details Method and device for controlling the stroke of a press machine Method and device for controlling the stroke of a press machine

1989-12-15

1991-07-16

Jones, David

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72 21, 72443, 36447407, B21J 920

Patent

active

050314319

ABSTRACT:
An apparatus and method for controlling a stroke of a cylinder-type press machine in which a forming process control pattern comprises a pressurizing interval in which a ram of the press is maintained at its bottom position at a constant pressure for a fixed time. Accordingly, warp and distortion of a workpiece due to a spring-back of the workpiece is suppressed. Another feature of the present invention is that either the punching or forming process can be accomplished by selecting a specified pattern for various types of control patterns stored in a punching process control pattern storage section and a forming process control pattern storage section.

REFERENCES:
patent: 4208935 (1980-06-01), Kollmar
patent: 4408471 (1983-10-01), Gossard et al.
patent: 4552002 (1985-11-01), Haenni et al.
patent: 4747283 (1988-05-01), Moore et al.
patent: 4819467 (1989-04-01), Graf et al.

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