Cutting insert and cutting tool having same mounted thereon

Abstract

A cutting insert according to an embodiment of the present invention is a double-sided cutting insert comprising an upper surface, a lower surface, a side surface, a cutting edge, and a mounting hole penetrating the upper surface and the lower surface, in which the upper surface is provided with a single upper surface boss portion that surrounds the mounting hole and is flat, the cutting edge includes a main cutting edge, a corner cutting edge extending from the main cutting edge, a sub-cutting edge extending from the corner cutting edge, and a side portion extending from the sub-cutting edge, a first main cutting edge flank surface extending from the main cutting edge forms an acute angle with an extension line of the upper surface boss portion, a sub-cutting edge chip breaker surface extending from the sub-cutting edge is at a gradually increasing angle with the extension line of the upper surface boss portion, as the sub-cutting edge chip breaker surface is distanced away from the corner cutting edge, and when the cutting insert is viewed into the upper surface, a side portion surface extending from the side portion is concavely recessed.

Dependencies are inferred from the claim text.