SURFACE COATED CUTTING TOOL

• Main Authors: SATO KENICHI, SANADA TOMOHIRO, TOJO SHUNSUKE, KOBAYASHI KO
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• 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; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TURNING

To provide a coated tool which has sufficient durability in a high-speed intermittent cutting work for alloy steel.SOLUTION: A surface coated cutting tool has a tool base body, and a hard coating layer including a lower layer and an upper layer on a surface of the tool base body. The lower layer is a Ti compound layer, and the upper layer has an average layer thickness of 2.0 to 20.0 μm and includes an Al2O3 layer. The number of grain boundaries, in which Ti and S are coexistent and are segregated, in two adjacent grain boundaries of Al2O3 crystal grains in the Al2O3 layer is 20% or more of the number of total grain boundaries.SELECTED DRAWING: Figure 2 【課題】合金鋼の高速断続切削加工において、十分な耐久性を有する被覆工具を提供する。【解決手段】工具基体と、該工具基体の表面に下部層と上部層を含む硬質被覆層を有する表面被覆切削工具であって、前記下部層はＴｉの化合物層であり、前記上部層は２．０〜２０．０μｍの平均層厚を有し、Ａｌ２Ｏ３層を含み、該Ａｌ２Ｏ３層内において隣接する２のＡｌ２Ｏ３結晶粒の粒界において、ＴｉとＳが共存して偏析している粒界の数が、全粒界の数の２０％以上である。【選択図】図２