| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cutting tool that inhibits chipping or peeling-off of a coating layer on a cutting edge and achieves improvement in welding resistance. <P>SOLUTION: A rotating tool such as a twist drill 1 is configured as follows. A base body 4 has a rod shape and includes a cutting edge 2 provided on the outer periphery, and a cutting-chip discharge groove 3 formed at a position further inwardly recessed than the cutting edge 2. The rotating tool is formed by coating one or more coating layers 5 on the surface of the base body. The surface of the cutting edge 2 has a second coating layer 5b, additionally formed on the side of the base body 4, in addition to a first coating layer 5a coated over the whole periphery of the base body 4. <P>COPYRIGHT: (C)2012,JPO&INPIT |
