| 摘要 |
A tool in the form of a tapering borer or reamer has cutting portions adjacent the body of the tool with chip-receiving grooves therebetween, arranged alternately around the periphery of the tool. The cutting portions and the grooves may be of a helical configuration or may extend in a straight configuration parallel to the longitudinal axis of the tool. Each cutting portion has a cutting face and a relief face which intersect at a cutting edge. The cutting face defines a rake angle with respect to a first reference plane while the relief face defines a relief angle with respect to a second reference plane which is normal to the first reference plane. In order to improve chip removal from a workpiece being machined and the flow of chip material away therefrom, the relief angle of each cutting portion is dependent on the diameter of the generated surface defined by the cutting edges of the tool upon rotation thereof about its longitudinal central axis, said diameter varying in the longitudinal direction of the tool.
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