| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated high speed tool steel-made gear cutting tool which realizes excellent wear and abrasion resistance of a hard coated layer in high speed gear cutting working of alloy steel. SOLUTION: On a surface of a high speed tool steel substrate of this surface coated high speed tool steel-made gear cutting tool, (a) the tool is composed of an upper part layer and a lower part layer made of (Cr, Al, B) N each, and the upper part layer and the lower part layer have average layer thickness of 0.5 to 1.5μm and 2 to 6μm, respectively, (b) the upper part layer has an alternately laminated layer structure composed of a thin layer A and a thin layer B having average layer thickness of one layer of 5 to 20 nm each, the thin layer A is composed of a (Cr, Al, B) N layer satisfying composition formula: (Cr<SB>1-(E+F)</SB>Al<SB>E</SB>B<SB>F</SB>) N, and the thin layer B is composed of a (Cr, Al, B) N layer satisfying composition formula: (Cr<SB>1-(M+N)</SB>Al<SB>M</SB>B<SB>N</SB>) N, and (c) the lower part layer is formed by depositing the hard coated layer composed of a (Cr, Al, B) N layer having a single phase structure and satisfying composition formula: (Cr<SB>1-(X+Y)</SB>Al<SB>X</SB>B<SB>Y</SB>) N. COPYRIGHT: (C)2007,JPO&INPIT
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