CUTTING TOOL OF SURFACE-COATED CERMET WITH HARD COATING LAYER ACHIEVING EXCELLENT ANTI-CHIPPING PERFORMANCE IN HIGH-SPEED CUTTING WORK TO HARD-TO-CUT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool of surface-coated cermet, comprising a hard coating layer achieving excellent anti-chipping performance in high-speed cutting work to hard-to-cut material.;SOLUTION: This cutting tool of surface-coated cermet comprises the hard-coating layer, of which surface layer is composed of a reformed (Cr, Zr)₂O₃ layer, with part of Cr substituted with Zr. Using a field emission type scan electron microscope, an electron beam is radiated to each crystal grain comprising a hexagonal crystal lattice existing in a measurement range of a surface polished surface to measure an inclination angle formed by the normal lines of face (0001) and face (10-10) as crystal faces of the crystal grain. In a component atom shared lattice point distribution graph, produced on the basis of measurement inclination angles obtained as results, the highest peak exists at Σ3, and the distribution ratio of Σ3 in ΣN+1 is 60% or more.;COPYRIGHT: (C)2007,JPO&INPIT