Patent ID: 6835028
Filing Date: 2004-12-28
Classification: B23B,Y10T

Abstract:
An indexable insert adapted for turning, which comprises a nose cutting-edge having a nose radius R, a linear cutting edge, and a minor cutting edge formed between the nose cutting-edge and the linear cutting edge, whereinthe minor cutting edge comprises a first minor cutting edge having a radius Ra and a second minor cutting edge having a radius Rb, the first and second minor cutting edges successively extending from a nose tip to the linear cutting edge; the nose cutting-edge and the first minor cutting edge are connected such that, at a connection point between an arc assumed by the nose cutting-edge and an arc assumed by the first minor cutting edge, a smaller intersectional angle &thgr;x of a tangent T12 and a tangent T21 to the respective arcs is 1Â° or less; the first minor cutting edge and the second minor cutting edge are connected such that, at a connection point between the arc assumed by the first minor cutting edge and an arc assumed by the second minor cutting edge, a smaller intersectional angle &thgr;y of the tangent T21 and a tangent T22 to the respective arcs is 1Â° or less; and wherein Ra>R, Ra falls within a range of 3 mm to 20 mm, and Rb&gE;1.5 Ra.