| 摘要 |
A cutting insert (14') comprises, at a forward end thereof, a cutting portion (66) having a cutting edge (98) and, at a rear end thereof, a locating portion (80). The locating portion (80) comprises an upper locating surface (82') and a lower locating surface (84). The upper locating surface (82') is divided into three sections, namely, a forward section (92) adjacent the cutting portion (66), a rear section (94) distal the cutting portion (66) and a middle section (96) located between the forward (92) and rear (94) sections. In a side view of the cutting insert (14'), the upper locating surface forward section (92) and the lower locating surface (84) lie on third (L3) and fourth (L4) straight lines, respectively. The upper locating surface rear section (94) lies on a fifth straight line (L5) that forms a third acute angle (±3) with the fourth straight line (L4), and the third (L3) and fifth (L5) straight lines are non-collinear. The third (L3) and fourth (L4) straight lines form a second acute angle (±2) therebetween, and converge to a point rearward of the cutting insert (14'). |
