| 摘要 |
A hard machining process uses a cylindrical tool (21) of ceramic or other hard machining material of comparatively low cost that provides a circular cutting edge to be engaged in cutting relation with hardened workpiece (20) to be machined. As tool cutting edge wear occurs, the tool (21) is rotated through a small angle to bring into contact with the workpiece (20) a fresh portion of the cutting edge. It is not necessary to rotate that tool (21) sufficiently to effect replacement of the entire cutting edge portion in engagement with the tool. Sufficient angular movement of the tool is made to replace that of the cutting edge that has the greatest effect on the finish of the machined workpiece (20), which is the cutting location where the removed chip is thinnest.
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