| 摘要 |
PROBLEM TO BE SOLVED: To provide a covered cutting tool compounded with an agglutination resistant film causing no separation of the film and abnormal abrasion by a thermal crack and a hard film excellent in oxidation resistance and abrasion resistance by restraining an increase in frictional resistance caused by agglutination with a machining material and a welding phenomenon. SOLUTION: In this covered cutting tool for alternately and respectively covering a cutting tool base body with one or more layers of an A layer composed of a Cr nitride and a B layer composed of a Till nitride, the A layer is constituted by having at least two or more kinds of crystal structures.
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