| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated cemented carbide broach which can ensure its precision over a long period of time by optimizing a cemented carbide available for the broach. SOLUTION: In the coated cemented carbide broach which is formed of the cemented carbide at least at a cutting edge portion, the cemented carbide contains WC having a mean particle size≤1.5μm, and has a coercive force in the range≥12 kA/m and <20 kA/m. Provided that a saturation magnetization value is represented by R and a value of 202×Co wt.%/100 is represented by S, a saturation magnetization ratio R/S satisfies the relationship of 0.65≤R/S≤0.95. Further a rake of the cutting edge is set in the range of larger than 0°and not larger than 10°. COPYRIGHT: (C)2007,JPO&INPIT
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