| 摘要 |
A cutting tool comprises a bit-holder fed at a prescribed feed amount f per revolution in a feeding direction and a throw-away tip made of superhard metal and including a rake face, an bottom face parallel to the rake face, and cutting blade edges. The throw-away tip is provided with recess on at least one of the rake and bottom faces thereof. A distance w3 between a side surface defining the recess and the cutting blade edge in the feeding direction is defined within a range satisfying the following formula represented by; f</=w3</=5f. Therefore rare and expensive cutter material can be saved, and the throw-away tip can be prevented from being damaged by cutting heat because its radiating area is made larger.
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