| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cutter with less power consumption and capable of performing high speed boring and high accurate cutting, by developing a thin tip capable of suppressing progress of a crack at generation of the crack. Ž<P>SOLUTION: An age-hardening material is used for a metal sheet 9 involved in the tip 4 or a substrate 2. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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