Detecting device for abnormal workpiece rotation in non-circular workpiece grinding machine
AssigneeJtekt Corporation
InventorMasaharu INOUE
Life of this patent
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Abstract
In a non-circular workpiece grinding machine, a proximity sensor is arranged to face a non-circular portion of a workpiece for sensing a maximum diameter portion of the non-circular portion to detect that the maximum diameter portion is rotating in a detection phase section when the work spindle is rotating in a low speed rotational phase region in which the work spindle is controlled by a numerical controller to rotate at a low speed. Abnormality judging means is provided for judging that an abnormal workpiece rotation is occurring when the maximum diameter portion of the non-circular portion is not detected by the proximity sensor in the state that the work spindle is rotating in the low speed rotational phase region.
Claims9
A detecting device for abnormal workpiece rotation in a non-circular workpiece grinding machine having a bed;
- a work head mounted on the bed and rotatably supporting a work spindle for supporting a workpiece with a non-circular portion thereon to be ground;
- a coupling member for coupling the work spindle with the workpiece to rotate the workpiece together with the work spindle in a predetermined angular phase relation;
- a wheel head rotatably carrying a grinding wheel and mounted on the bed to be movable back and forth in a direction intersecting with a rotational axis of the work spindle;
- a control device for controlling the rotation of the work spindle and the back and forth movement of the wheel head in a correlation according to profile data defining a finish shape of the non-circular portion and for varying the rotational speed of the work spindle in accordance with a grinding condition;
- the detecting device comprising:
- a sensor arranged to face a non-circular portion being ground with the grinding wheel for sensing a maximum diameter portion of the non-circular portion to detect that the maximum diameter portion is rotating in a detection phase section when the work spindle is rotating in a low speed rotational phase region in which the control device controls the work spindle to rotate at a low speed;
- and
- abnormality judging means for judging that abnormal workpiece rotation is occurring, when the maximum diameter portion of the non-circular portion is not detected by the sensor with the work spindle rotating in the low speed rotational phase region.
Dependencies are inferred from the claim text.