Patent ID: 7182555

Claim:
An indexable insert comprising: an insert having a polygon face in a polygonal plate shape; a pair of cutting edges intersecting at corner parts of the polygon face and extending respectively therefrom, and formed on a ridge part of the polygon face; rake faces formed on the polygon face, gradually inclining away from the cutting edge, the angle of inclination thereof becoming smaller as the rake face extends away from the tip of the corner part along the cutting edge; a land formed along the cutting edge, inclining gradually to sink away from the cutting edge at an angle of inclination smaller than the angle of inclination of the rake face, the angle of inclination thereof becoming smaller as the land extends away from a tip of the corner part along the cutting edge; at least one main convex being a convex spherical face shape and formed away from the cutting edges on the rake faces, on the corner part; and at least one pair of sub convexes being a convex spherical face shape and formed respectively at positions further away from the corner parts than the main convex on the rake faces, along the pair of cutting edges.