Surface-coated cutting tool
AssigneeMitsubishi Materials Corporation
InventorHidetoshi Asanuma
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Abstract
In a surface-coated cutting tool in which a hard coating layer having a total layer thickness of 0.5 to 10 μm is deposited on a surface of a tool body made of WC-based cemented carbide or TiCN-based cermet, the hard coating layer has an alternately laminated structure of A layers and B layers, in a case where the A layer is: (AlaTi1-a)N (here, a is in atomic ratio), the A layer satisfies 0.50≤a<0.75, in a case where the B layer is: (AlbTi1-b)N (here, b is in atomic ratio), the B layer satisfies 0.75≤b≤0.95, and when a layer thickness per layer of the A layers is represented by x (nm) and a layer thickness per layer of the B layers is represented by y (nm), 5y≥x≥3y and 250 (nm)≥x+y≥100 (nm) are satisfied.
Claims1
A surface-coated cutting tool in which a hard coating layer having a total layer thickness of 0.5 to 10 μm is deposited on a surface of a tool body made of tungsten carbide cemented carbide or titanium carbonitride cermet, wherein
- (a) the hard coating layer has an alternately laminated structure of A layers and B layers,
- (b) in a case where the A layer is expressed by a composition formula:
- (AlaTi1-a)N (here, a is in atomic ratio), the A layer satisfies 0.50≤a<0.75,
- (c) in a case where the B layer is expressed by a composition formula:
- (AlbTi1-b)N (here, b is in atomic ratio), the B layer satisfies 0.75≤b≤0.95, and
- (d) when a layer thickness per layer of the A layers is represented by x (nm) and a layer thickness per layer of the B layers is represented by y (nm), 5y≥x≥3y and 250 (nm)≥x+y≥100 (nm) are satisfied.
Dependencies are inferred from the claim text.