| 摘要 |
A cutting insert removably mounted on an insert seat (4) formed in a peripheral of a tool body (1) rotated around an axis O and of substantial disc shape, comprising a substantially planar insert body (10) of a substantially square shape in plan view, a flank (11) at an upper face of the bods (10), a rake face (12) at a side of the body (10) intersecting with the flank (11), and a cutting edge (13) at an intersection ridge between the rake face (12) and the flank (11). The cutting edge (13) is a substantial involute in side view of the body (10), the rake face (12) is inclined to an inside of the body (10) from an upper toward a lower face, and at least a front end (12a) arranged in a peripheral of the tool body is concave constituting a part of a substantially conical side face. |
