| 摘要 |
Provided is a cutting insert including an insert body in the form of a substantially rhombic flat plate, a rake face on at least one rhombic surface of the insert body, a corner portion provided at a corner of the rake face, and at least one pair of cutting edges provided at a side ridge portion of the rake face and crossing the corner portion. A breaker projection is provided on the rake face near the corner portion so as to bulge gradually along a bisector of the corner portion with distance from the corner portion. The breaker projection includes a front apex portion substantially in the shape of a convex circular arc in a section along the bisector and a side portion which includes a recess substantially in the shape of a concave circular arc in a section perpendicular to the bisector.
|
