| 摘要 |
A cutting tool for cutting a lead-free copper-based bearing alloy containing 75 to 95% by mass Copper(Cu):, 1 to 15% by mass Bismuth(Bi), and 1 to 10% by mass hard particles comprising metal phosphide, boride, or carbide. The Cutting tool includes a rake surface, a clearance surface, and a cutting edge formed on a line of intersection between the rake surface and the clearance surface. A tip end site including the cutting edge comprises a diamond tip, and the diamond tip comprises a sintered body formed by sintering diamond particles having an average particle diameter (D50) between 0.2 mum and 1.6 mum. The cross section of the cutting edge preferably has a curved surface shape with a radius of curvature between 10 mum and 50 mum.
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