| 摘要 |
<p>A cutting insert is provided with an insert main body formed in the shape of a tetragonal plate, and the insert main body has a pair of tetragonal faces (2) and four side faces (3). Four cutting edges (7) are formed at ridge lines between the adjacent side faces (3), each of which is provided with a major cutting edge (5) and a pair of minor cutting edges (6) extending from both ends of the major cutting edge (5). Four tetragonal rake faces (8) are formed on a pair of side faces (3a, 3a), the three sides of each of which is formed by the major cutting edge (5) and the pair of minor cutting edges (6). A major cutting edge (5a) continuing to a first rake face (8a) and a major cutting edge (5b) continuing to a second rake face (8b) extend in a different direction to each other so as to intersect in an X-letter shape.</p> |
