| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool with a hard coating layer for exhibiting excellent abrasion resistance, in the high speed strong intermittent cutting work of alloy steel. <P>SOLUTION: The surface-coated cutting tool is provided by depositing and forming the hard coating layer formed of (Cr, Al, M)N (here, M is Nb or Ta) on a surface of a tool base body constituted of tungsten carbide group cemented carbide or titanium carbonitride group cermet. The hard coating layer is constituted as an alternate laminated structure of a thin layer A constituted of a granular crystal (Cr, Al, M)N and a thin layer B constituted of a columnar crystal (Cr, Al, M)N. The thin layer A and the thin layer B have layer thicknesses of 0.05-2 μm, respectively. The crystal grain size of the granular crystal is 30 nm or smaller, and the crystal grain size of the columnar crystal is 50-500 nm. <P>COPYRIGHT: (C)2012,JPO&INPIT |
