Cutting tool
AssigneeKYOCERA Corporation
InventorsMasahiro Waki, Mitsuru Hasegawa
Life of this patent
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Abstract
A cutting tool with a substrate which is coated with a coating layer containing TiaAlbNbdMe(C1-xNx), where M represents one or more elements selected from among Si, W, Mo, Ta, Hf, Cr, Zr and Y, where 0.1≦a≦0.7, 0≦b≦0.8, 0.02≦d≦0.25, 0≦e≦0.25, a+b+d+e=1.0 and 0≦x≦1 and is provided with a rake face; a flank face; a cutting edge between the rake face and the flank face; and droplets on the surface of the coating layer. The droplets include finer droplets having particle diameters of 300 nm or less; and coarser droplets having particle diameters of 1000 nm or more. The flank face has a higher percentage of the finer droplets than the rake face. An Nb content in the coarser droplets on the flank face is higher than an Nb of the coarser droplets on the rake face.
Claims8
A cutting tool, comprising:
- a substrate comprising a rake face and a flank face;
- a coating layer on the substrate, comprising Ti1-a-b-cAlaSibMc(C1-xNx) where M is at least one selected from the group consisting of Y, Group-4, 5, and 6 metals, excluding Ti, wherein following equations are satisfied at the rake face:
- 0.3≦a≦0.7;
- 0.01≦b≦0.2;
- 0≦c≦0.3;
- and
- 0<x≦1, and
- the following equations are also satisfied:
- 1.05≦Sif/Sir≦3.2 and
- 1.03≦Alr/Alf≦1.6,
- where Sir is a proportion of Si in the coating layer at the rake face, Sif is a proportion of Si in the coating layer at the flank face, Alr is a proportion of Al in the coating layer at the rake face, and Alf is a proportion of Al in the coating layer at the flank face.
Dependencies are inferred from the claim text.