| 摘要 |
<p>A cutting insert (22) of a trigonal shape. The cutting insert has a peripheral surface (34) that extends between two opposing identical end surfaces (28). A median plane (M) bisects the cutting insert between the end surfaces. A through bore (36) extends between the end surfaces. A cutting edge, formed at the intersection of each end surface with the peripheral surface, is divided into three identical cutting sections (40). Each cutting section is located between two vertexes (38) of the trigonal shape. Each cutting section has a convex primary cutting edge (42) and a concave secondary cutting edge (44) that merge together. An insert tangential abutment surface (50) is located between the cutting edge and the through bore. A primary relief surface (52) forms an insert internal obtuse angle (α) with a first reference plane (P1). A secondary relief surface (54) forms an insert internal acute angle (β) with a second reference plane (P2).</p> |
