| 摘要 |
PROBLEM TO BE SOLVED: To provide a broach made of coated cemented carbide, capable of maintaining precision of the broach for a long period by optimizing cemented carbide used for the broach. SOLUTION: In this broach made of coated cemented carbide, cemented carbide is used at least for a cutting edge part, and the cemented carbide has average WC grain size of 1.5μm or less, and coercive force of 12 kA/m or more and less than 20 kA/m. With a saturated magnetization value set as R, and the value of 202×Co wt%/100 as S, a saturated magnetization ratio R/S is 0.65≤R/S≤0.95. The coating layer is solid lubricant film including a hard carbon film. COPYRIGHT: (C)2007,JPO&INPIT
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