Patent ID: 8931979
Filing Date: 2015-01-13
Classification: B23C,Y10T

Abstract:
1. A cutting insert having top and bottom surfaces spaced apart from one another in a thicknesswise direction and front and rear surfaces spaced apart from one another in a widthwise direction, comprising; a first cutting edge and a second cutting edge formed in a lengthwise direction at intersection portions where the top surface intersects with the front surface and the rear surface, respectively; a third cutting edge and a fourth cutting edge formed in the lengthwise direction at intersection portions where the bottom surface intersects with the front surface and the rear surface, respectively; a plurality of recesses dividing the first to fourth cutting edges; rake surfaces formed on the front and rear surfaces and extending from each of the first to fourth cutting edges in an inward direction of the cutting insert; wherein the plurality of recesses extend in the widthwise direction along the top surface from the first cutting edge to the second cutting edge and along the bottom surface from the third cutting edge to the fourth cutting edge; wherein the plurality of recesses are symmetric with respect to a lengthwise centerline (A) running between the first and third cutting edges on the front surface in a front view of the cutting insert; and wherein the plurality of recesses are asymmetric with respect to a thicknesswise centerline (B) perpendicular to the lengthwise centerline (A), in said front view of the cutting insert.