| 摘要 |
PROBLEM TO BE SOLVED: To provide further excellent machining accuracy when highly accurate machining such as mirror finishing is performed by a dry method by using a single crystal diamond tool. SOLUTION: A plurality of annular grooves 30 as grooves for heat radiation are provided on an outer peripheral surface of a body 12, and thereby a temperature rise of the body 12 due to heating generated in cutting edges 24 and 26 and a rake face 22, etc. during cutting and further thermal expansion of the body 12 according to the temperature rise are suppressed. As a result, position changes of cutting edges 24 and 26 of the single crystal diamond 14 caused by the thermal expansion of the body 12, that is, displacement to an axial direction distal end side is suppressed, to obtain further excellent machining accuracy, even when the highly accurate machining such as mirror finishing is performed by the dry method. COPYRIGHT: (C)2010,JPO&INPIT |
