| 摘要 |
A metal cutting insert (1) having an arcuately shaped cutting edge (14); a rake surface (15) extending inwardly from the cutting edge and chip forming means (16) located inwardly of said rake face; and comprising a pair of curved chip deflector surfaces (16a,16b) sloping uniformly and smoothly away from said rake surface towards respective deflector surface peaks (17a,17b); the deflector surfaces being concavely curved in an axial direction and convexly curved in a lateral direction; a valley portion (18) extending longitudinally and centrally between said deflector surfaces; the deflector surfaces sloping uniformly away from said side relief flanks towards said valley portion in a direction towards the bottom face so as to merge smoothly with said valley portion via smoothly curved corners; the lateral extent of each deflector surface diminishing uniformly from a maximum adjacent said rake surface to a minimum adjacent the respective surface peak. |
