Assadollah Eddie Farazandeh

US Patent:

41482034, Apr 10, 1979

Filed:

Oct 7, 1977

Appl. No.:

5/840315

Inventors:

Assadollah Farazandeh - Aurora IL
Buford R. Everett - Indian Head Park IL

Assignee:

Dreis & Krump Mfg. Co. - IL

International Classification:

B21D 502

US Classification:

72 21

Abstract:

A computer-controlled hydraulic press brake includes an actuator and control system which automatically provides variable pre-programmable ram opening and closing strokes. A microprocessor within the control system responds to stroke parameters entered by the operator and an encoder-generated signal indicative of ram position to generate a velocity command signal defining a velocity profile for positioning the ram to the stroke limits. Closed-loop servo systems associated with each ram cylinder respond to the velocity command signal to cause movement of the ram in accordance with the velocity profile. A ram leveling circuit responsive to individual position sensors associated with respective sides of the ram compensates for ram tilt by simultaneously applying complimentary correction signals to the respective servo systems. A second velocity profile may be generated in response to stored parameters to position a back gauge concurrently with ram movement by means of a second motor drive servo system.