Patent ID: 8328472

Claim:
A cutting insert, comprising: a body including a top surface, a bottom surface, a plurality of side surfaces connecting the top surface and the bottom surface, the body further including a plurality of corner surfaces connecting adjacent side surfaces; one or more auxiliary cutting edges with a convex curve shape, the auxiliary cutting edges being formed at intersections between the top and bottom surfaces and one or more of the plurality of side surfaces; and one or more main cutting edges formed at intersections between the top and bottom surfaces and one or more of the plurality of corner surfaces, wherein each of the top surface and the bottom surface comprises a mounting surface and a rake surface extending at an inclined angle with respect to the mounting surface; wherein the main cutting edge in the top surface extends from an end point of an adjacent auxiliary cutting edge to a center of the main cutting edge in a direction towards the bottom surface, and from the center to a meeting point with another adjacent auxiliary cutting edge in a direction away from the bottom surface; and wherein the main cutting edge in the bottom surface extends from an end point of an adjacent auxiliary cutting edge to the center of the main cutting edge in a direction towards the top surface, and from the center to a meeting point with another adjacent auxiliary cutting edge in a direction away from the top surface.