| 摘要 |
<p>A cutting insert has an insert body (1) having a shaft-shape, wherein a cutting edge portion (2) having a square rake face (5) is formed on an end portion of the insert body (1), and wherein the rake face (5) includes: a pair of side cutting edges (3) extending in a longitudinal direction of the insert body (1); a front cutting edge (4) extending in a transverse direction perpendicular to the longitudinal direction between each front ends of the side cutting edges (3); and a pair of protruded streaks (11) extending toward a corner portion (6) at which each of the side cutting edges (3) intersects the front cutting edge (4), each of the protruded streaks (11) including an outer wall face (14) having a protruded curved face which faces the adjacent side cutting edge (3) and protrudes toward the side cutting edge (3) as seen in a direction facing the rake face (5) and perpendicular to the longitudinal direction.</p> |
