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US 6,241,258 B1Granted
Method of controlling clamping and unclamping of a hydraulic chuck
AssigneeGamet Precision
InventorJacques Roussel
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AssigneeGamet Precision
InventorJacques Roussel
Estimating the term…
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.
A method of controlling a hydraulic chuck of a rotary machine tool, said chuck being adapted to clamp a workpiece to be machined and actuated by a double-acting clamping/unclamping actuator, the method consisting in applying to at least one chamber of said actuator a clamping pressure controlled in accordance with a clamping pressure set point and maintaining said clamping pressure in the corresponding chamber if the control pressure upstream of said actuator suddenly falls due to a malfunction, in which method said clamping pressure is controlled by a closed loop and said clamping pressure in said chamber is modified to disable maintaining of said pressure for a predetermined time period in response to an operator request to modify the clamping force applied to said workpiece, the disabling time being at least equal to the time necessary to stabilize said control.
Dependencies are inferred from the claim text.