SURFACE-COATED CUTTING TOOL EXCELLENT IN DEFECT RESISTANCE

To provide a surface-coated cutting tool excellent in defect resistance.SOLUTION: A surface-coated cutting tool has a hard coating layer of total average thickness of 0.55-10.5 μm which has at least two layers of a lower layer of average thickness of 0.05-1.0 μm directly contacting the surface of a...

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Bibliographische Detailangaben
Hauptverfasser:	TATSUOKA SHO, ASARI SHOTA, KASHIWA NAOKI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BORING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY MILLING PERFORMING OPERATIONS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TURNING
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Beschreibung
Zusammenfassung:	To provide a surface-coated cutting tool excellent in defect resistance.SOLUTION: A surface-coated cutting tool has a hard coating layer of total average thickness of 0.55-10.5 μm which has at least two layers of a lower layer of average thickness of 0.05-1.0 μm directly contacting the surface of a tool substrate comprising a tungsten carbide-based hard metal, and an upper layer of 0.5-9.5 μm directly contacting the lower layer. The compressive residual stress value of the tool substrate is 300 MPa or more but 2,000 MPa or less. The lower layer is a Ti nitride layer or Ti carbonitride layer, and the upper layer satisfies 0.75≤Xavg≤0.90 and 0≤Yavg