| 摘要 |
A cutting insert includes a rake face region located on an upper surface, a flank located on a front surface, and a cutting edge located at an intersection between the rake face region and the flank. At least three types of projections having different distances from the cutting edge are on the rake face region. When these three types of projections are arranged in the order of increasing distance from the cutting edge, namely, a first projection, a second projection and a third projection, the top of the second projection is lower than an imaginary straight line connecting the top of the first projection and the top of the third projection in the side view. |
