CEMENTED CARBIDE INSERT FOR PARTING, GROOVING AND THREADING

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool insert useful for parting, grooving and threading in steel, stainless steels, and HRSA, under wet conditions, a cutting tool insert with improved resistance against plastic deformation and wear resistance and a cutting tool where the improved resistance against plastic deformation has not been obtained at the expense of lowered edge line toughness.;SOLUTION: The cutting tool insert for parting, grooving and threading in steel and stainless steels comprises a substrate and a coating. The substrate comprises WC, 7.5 to 10.5 wt.% Co, 0.7 to 1.1 wt.% Cr and 100 to 300 ppm Ti. Ti may partly be replaced by Ta to a weight ratio Ti/Ta of equal to or more than about 0.8. The coating comprises two (Ti, Al) N-layers with different Al/Ti-ratios, that is, an inner Al_yTi_1-yN-layer with y equals 0.4 to 0.67 with a thickness of 0.3 to 2.5 μm and an outer Al_wTi_1-wN-layer with w equals 0.15 to 0.35 with a thickness of 0.5 to 5.0 μm.;COPYRIGHT: (C)2009,JPO&INPIT