| 摘要 |
<p>An object is to provide a sintered cubic boron nitride tool which can perform stable machining without causing any defect for a long lifetime even under a high-load cutting condition and a high-efficiency cutting condition. The sintered cubic boron nitride tool is such that: assuming a reference length longer than five times an average particle size of cubic boron nitride is S, when a total length of profile curves of cubic boron nitride included in the reference length S of the chamfer honing surface is LCC, when a total length of profile curves of the binder phase included in the reference length S of the chamfer honing surface is LCB, and a ratio of LCC to LCB is PC (PC=LCC/LCB), and when a total length of profile curves of cubic boron nitride included in the reference length S of the round honing surface is LRC, a total length of profile curves of the binder phase included in the reference length S of the round honing surface is LRB, and a ratio of LRC to LRB is PR (PR=LRC/LRB), then, a ratio of PR to PC (PR/PC) satisfies the relation of 1.2‰¦PR/PC‰¦8.0.</p> |
