Patent ID: 7665933
Filing Date: 2010-02-23
Classification: B23B,Y10T

Abstract:
1. A cutting insert comprising: an insert body formed in a shaft-shape; a cutting edge portion that is formed on a front end portion of the insert body and has a square rake face; a pair of side cutting edges that are formed along both sides of the rake face and extend in a longitudinal direction of the insert body; a front cutting edge that is formed along the front end of the rake face between each of front ends of the side cutting edges and extends in a transverse direction perpendicular to the longitudinal direction; and a pair of protruded streaks that are formed on the rake face and extend toward each of corner portions at which each of the side cutting edges intersects the front cutting edge; and a pair of projections which are each formed on the rake face between a front end of the protruded streak and the corner portion so as to be separated from the protruded streak.