Indexable cutting insert

Cutting insert for chipforming machining of metal workpieces, comprising a polygonal body of wear resistant material including opposed top and bottom surfaces and a plurality of side walls extending therebetween, a plurality of cutting edges formed by the intersection of said side walls and at least one of said top and bottom surfaces, pairs of said cutting edges converging toward respective corners of said insert, said corners including curved corner cutting edge portions, a continuous land area extending inwardly from said cutting edge toward a center of the insert, a chip breaker groove located along each cutting edge inwardly of the associated land area, said chip breaker groove comprising a row of concave depressions extending along each cutting edge, said row of concave depressions including a pair of end depressions arranged at opposite ends of the associated cutting edge and situated adjacent respective corners of said insert, and a series of intermediate depressions extending between said pair of end depressions, said end depressions extending along respective end portions of a respective cutting edge, and said intermediate depressions extending along respective intermediate portions of a respective cutting edge, said end portions of adjacent cutting edges being separated by respective ones of said curved corner cutting edge portions, each of said cutting edge end portions being longer in length than each of said cutting edge intermediate portions as said top surface is viewed in plan, said cutting edge end portions being straight as said insert is viewed in side elevation and in top plan, and said cutting edge intermediate portions forming a wave shape as said insert is viewed in side elevation.