| 摘要 |
A machining apparatus, in which a plurality of user set programs in relation to one axis is written and the amount of the infeed motion of the grinding wheel is increased to restrain the change of the load of the grinding wheel, improves a machining accuracy and achieve a longer life of the grinding wheel. When the grinding wheel 30 cut arc portions 11 A, 11 C, U having its diameter of which is gradually small according to a position apart from the shoulder, the numerical controller 40 controls a rotation of the workpiece 10 around said C-axis, a motion of a grinding wheel 30 relative to the workpiece 10 along an X-axis and Z-axis to trace an arc profile of the arc portion 11 A, 11 C, U of the extending portion, and an infeed motion of the grinding wheel 30 to the workpiece 10 along the X-axis to increase gradually an amount of the infeed motion of the grinding wheel 30 to the workpiece 10 along the X-axis in order to grind the extending portion to the arc profile and in order to increase gradually a grinding load of the grinding wheel 30.
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