| 摘要 |
The present invention relates to a cutting insert which ensures fracturing resistance and chipping resistance on light cutting of stainless steel, thereby suppressing the occurrence of burrs at a cutting boundary to prevent abnormal wear. The cutting insert is provided with a cutting edge (5) which has a corner section (6) that forms a convex arc shape when seen in a planar view from direction facing the rake face (2) and a linear section (7) that is in contact with the corner section (6) at least at one end of the corner section (6) and extends linearly. The cutting edge (5) is provided with a first region (A) along the corner section (6) when seen in a planar a second region (B) along the linear section (7) and a third region (C) between the first region (A) and the second region (B). A rake angle of the cutting edge (5) in the third region (C) is made greater than rake angles of the cutting edges (5) in the first region (A) and the second region (B). |
