SURFACE-COATED CUTTING TOOL HAVING HARD COATING LAYER EXERTING EXCELLENT CHIPPING RESISTANCE

• Main Authors: ISHIGAKI TAKUYA, NAKAMURA DAIKI, YANAGISAWA MITSUAKI, HONMA HISASHI
• Format: Patent
• Language: English; Japanese
• Published: 03.09.2020
• Subjects: 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

To provide a surface-coated cutting tool having excellent chipping resistance and exerting superior cutting performance for a long term even in a high-speed intermittent cutting process for a cast iron or the like.SOLUTION: In a surface-coated cutting tool, a hard coating layer having an average layer thickness of 1.5-25.0 μm has: a layer of a tool surface side which consists mainly of a hexagonal crystal structure having an average layer thickness of 0.5-5.0 μm, satisfies 0.70≤xα≤0.95 and 0.0000≤yα≤0.0150 (here, xα, yα are the average values of atomic ratio) in a composition: (AlxαMe1-xα)(CyαN1-yα)(here, Me is one or more of Si, Zr, V, Cr, Nb, Hf and Mn), and has a push-in hardness of nanoindentation of 15-28 GPa; and the layer of a tool substrate side which consists mainly of a cubic crystal structure having the average layer thickness of 1.0-20.0 μm, satisfies 0.65≤xβ≤0.95 and 0.0000≤yβ≤0.0150 (xβ, yβ are the average values of atomic ratio) in the composition: (AlxβTi1-xβ)(CyβN1-yβ), and has the push-in hardness of nanoindentation of 30-45 GPa.SELECTED DRAWING: Figure 1 【課題】鋳鉄等の高速断続切削加工でも優れた耐チッピングを有し長期間優れた切削性能を発揮する工具を提供【解決手段】工具基体表面の１．５〜２５．０μｍの平均層厚の硬質被覆層は、平均層厚０．５〜５．０μｍの六方晶構造を主とする（ＡｌｘαＭｅ1 -ｘα）（ＣyαＮ１−yα）（ＭｅはＳｉ、Ｚｒ、Ｖ、Ｃｒ、Ｎｂ、Ｈｆ、Ｍｎの一種以上）が、０．７０≦ｘα≦０．９５かつ０．００００≦ｙα≦０．０１５０（ｘα、ｙαは原子比の平均値）でナノインデンテーション押込み硬さ１５〜２８ＧＰａの工具表面側の層と平均層厚１．０〜２０．０μｍの立方晶構造を主とする（ＡｌｘβＴｉ1 -ｘβ）（ＣyβＮ１−yβ）が０．６５≦ｘβ≦０．９５かつ０．００００≦ｙβ≦０．０１５０（ｘβ、ｙβは原子比の平均値）でナノインデンテーション押込み硬さ３０Ｇ〜４５ＧＰａの工具基体側の層とを有する表面被覆切削工具【選択図】図１