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Method of controlling hydraulic press

  • US 5,071,603 A
  • Filed: 12/13/1988
  • Issued: 12/10/1991
  • Est. Priority Date: 12/14/1987
  • Status: Expired due to Fees
First Claim
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1. In a method of controlling a hydraulic press wherein, when at least one of a pair of metal mold halves is moved by a hydraulic cylinder to compression mold a work within a cavity defined between said metal mold halves, the velocity of movement of said at least one metal mold half by said hydraulic cylinder toward the work is controlled until pressurization of the work is started, but after starting of the pressurization, the pressurizing force of said hydraulic cylinder is controlled, the improvement wherein:

  • (a) a position of a movable member which is moved by said hydraulic cylinder is successively detected during the velocity control, and(b) changing over from the velocity control to the pressure control is effected at a point of time when the detected position of said movable member coincides with a preset value.

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