| 摘要 |
<p>A cutting insert comprising at least one cutting edge (5), a rake surface (2) which extends from the cutting edge (5), a relief surface (3) which intersects the rake surface (2) with the cutting edge (5) disposed therebetween, a recess (6) which is, when viewed from the cutting edge (5), located behind the rake surface (2) so as to be recessed downward from the rake surface (2), and at least one protrusion (7) which protrudes upward from the bottom surface (6a) of the recess. The entire protrusion is disposed below an extension surface of the rake surface (2), and at least one portion of the upper surface of the protrusion is separated from the extension surface of the rake surface as the at least said portion is separated from the cutting edge.</p> |
