Double negative indexable cutting insert with projecting lateral contact surfaces and the cutting tool

摘要

A double negative indexable cutting insert (14) has a switch shaft (a), two opposite end faces (36), a peripheral lateral surface (38), which extends between them, and opposite side cutting edges (46), which is between the end faces (36) and the peripheral lateral surface (38) are formed. A median plane (p) is located in the middle between the end faces (36), extends through the peripheral lateral surface (38) and is perpendicular to the shifting axis (a). The peripheral lateral surface (38) has at least one projection (54), which in a plan view of each end face (36) in an outward direction relative to the shifting axis (a) extends. The projection (54) has two lateral contact surfaces (60) which, in the outward direction to the median plane (p) converge towards. In each cross section perpendicular to the median plane (p), which by means of the two opposite side cutting edges (46) and also by the at least one projection (54), is not a portion of the circumferential surface (38) lying on the inside with respect to an imaginary line (l1), the opposed side cutting edges (46) connects.