Method of controlling clamping and unclamping of a hydraulic chuck
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United States of America Patent
Stats
-
Jun 5, 2001
Grant Date -
N/A
app pub date -
Oct 25, 1999
filing date -
Oct 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method is disclosed of controlling a hydraulic chuck of a rotary machine tool, the chuck clamping a workpiece to be machined and being actuated by a double-acting clamping/unclamping actuator. A clamping pressure controlled in accordance with a clamping pressure set point is applied to at least one chamber of the actuator and the clamping pressure is maintained in the corresponding chamber if the control pressure upstream of the actuator suddenly falls due to a malfunction. The clamping pressure is controlled by a closed loop and is modified in the chamber to disable the aforementioned maintaining of the pressure for a predetermined time period in response to an operator request to modify the clamping force applied to the workpiece. The disabling is being at least equal to the time necessary for the control system to stabilize.
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