| 摘要 |
A cutting tool (10; 30; 50) is provided which comprises a curved cutting edge (13; 33; 53) at a nose (12; 32; 52), a pair of straight cutting edges (14, 14: 34, 34; 54, 54) between which the nose is located, and a chamfer (15; 35; 55) extending along the cuzved cutting edge and the straight cutting edges. A portion of the chamfer extending along the curved cutting edge forms a curved ridge (15a; 35a; 55a) at the junction with a tool face (17; 37; 57) and increases in width from a junction (P1) of the curved cutting edge and each of the straight cutting edges to a midpoint (Q) of the curved cutting edge when observed in plan. <IMAGE> |
