Method of and apparatus for automatically controlling pressing force of press machine
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United States of America Patent
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-
Jan 10, 1995
Grant Date -
N/A
app pub date -
Jul 28, 1993
filing date -
Dec 3, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Pressing force with which a die tool presses on a workpiece is controlled so as to be constant at all times. The magnitude of pressing force with which the die tool presses on the workpiece during press working is detected with a semiconductor strain gauge (84), and the pressing force detected and a preset pressing force are compared with each other by a controller. If there is a difference between the pressing force detected and the preset pressing force, a screw rod (35) is turned by an AC servomotor (24) so as to adjust the length of a lower ram (60), thereby controlling the pressing force.
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Cited Art Landscape
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