Patent ID: 6612786
Filing Date: 2003-09-02
Classification: B23B,Y10T

Abstract:
A cutting tool of a polycrystalline hard sintered material adapted to cut a hardened steel or a cast iron, comprising a cutting edge that comprises the polycrystalline hard sintered material which contains at least 20 vol % of CBN,wherein a radius of curvature in cross section of a ridge of said cutting edge has a range of 5 &mgr;m to 30 &mgr;m, a flank and a rake face or negative land of the cutting tool are smoothly continued at said radius of curvature in cross section, and a surface roughness of the ridge of the cutting edge has a range of 0.1 &mgr;m to 1.0 &mgr;m corresponding to an average roughness (Rz) of a ten point system.