| 摘要 |
<p>A thread cutting insert includes main cutting edges that have a pair of thread cutting edges and wiper thread cutting edges for full profile on side edges of a rake face formed on the insert body respectively. / The pair of thread cutting edges is formed in a convex V shape as viewed in a plane facing the rake face, and the wiper thread cutting edges for full profile are connected to posterior ends of the thread cutting edges, / An inner portion of a V-shaped projection of the rake face, which is formed on the front side of the wiper thread cutting edge for full profile by the pair of thread cutting edges, is formed not to protrude from the thread cutting edges as viewed in the plane, / A first convex protrusion projecting from the rake face, a second convex protrusion higher than the first convex protrusion, and the third convex protrusion higher than the first and second convex protrusions project on the rear side of the wiper thread cutting edge for full profile of the rake face as viewed in the plane, and the first and second convex protrusions are positioned closer to the main cutting edge than the third convex protrusions.</p> |
