THROWAWAY CUTTING TIP OF SURFACE-COATED CERMET WITH HARD COATING LAYER ACHIEVING EXCELLENT ANTI-CHIPPING PERFORMANCE IN HIGH-SPEED CUTTING WORK

摘要

PROBLEM TO BE SOLVED: To provide a coated cutting tip with a hard coating layer achieving excellent anti-chipping performance in high-speed cutting work. SOLUTION: This coated cutting tip comprises the hard coating layer of a lower layer of Ti compound and an upper layer ofα-type Al2O3which are formed by deposition on the surface of tip base material. Polishing fluid including SiC grains as spray polishing material is sprayed by wet blast as a layer of subject material composed of a layer of metal nitride out of CrN, HfN, ZrN, and VN, each having average layer thickness of 0.5-5μm, is formed by deposition along the whole surface of the upper layer ofα-type Al2O3for polishing the surface of the upper layer ofα-type Al2O3, except for the subject material layer at the periphery of a tool mounting hole to achieve a surface roughness Ra of 0.2μm. COPYRIGHT: (C)2007,JPO&INPIT