| 摘要 |
<p>Provided is a cutting insert where cutting resistance can be reduced under a wide range of cutting conditions, and where it is possible to treat debris in a stable manner. This cutting insert is provided with chip breaker grooves formed inside of corner cutting edges, and protruding sections which protrude upward from the chip breaker grooves. Each protruding section comprises a top surface, a front protruding surface, and side protruding surfaces. Each top surface intersects with both the front protruding surface and the side protruding surfaces. A first intersecting ridge line section where the front protruding surface intersects with the top surface extends linearly. Second intersecting ridge line sections where the side protruding surfaces intersects with the top surface extend from both ends of the first intersecting ridge line section in such a way that with increasing distances from the corner cutting edge, the distances from the corresponding side ridge cutting edges gradually increase. The front protruding surface is convexly curved outward. The side protruding surfaces are also convexly curved outward.</p> |
