| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary cutting multi-edged tool capable of working a cut difficult material with high accuracy and with high efficiency. SOLUTION: In this rotary cutting multi-edged tool, the tool excellent in working accuracy and working efficiency and reducing tool cost can be provided by making a cutting edge as a composite edge which is mainly made of monocrystal diamond tips and vapor phase synthetic diamond tips.
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