| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool material using a cBN sintered body for a blade, having a high breakage strength. SOLUTION: The tool material in a columnar shape is formed of the cBN sintered body at one end and a WC-based cemented carbide at the other, wherein: the WC-based cemented carbide comprises a cemented carbide A and a cemented carbide B longitudinally, with one end of the cemented carbide A having a faying surface C with the cBN sintered body and the other having a faying surface D with the cemented carbide B; the cemented carbide A has a WC average grain size d1 (μm) within a range of 2≤d1≤4 and contains Co in an amount of 6-12% by mass; the cemented carbide B has a WC average grain size d2 (μm) within a range of 0.3≤d2≤1 and contains Co in an amount of 5-11%; and the tool material 1 has a length L (mm) and a diameter D (mm) within the ranges of 3≤L≤60 and D≤6, respectively. COPYRIGHT: (C)2009,JPO&INPIT
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