Hard coating film for cutting tool
AssigneeKorloy Inc.
InventorsJin-han Gwon, Seung-su Ahn, Je-hun Park
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Abstract
The present invention relates to a cutting tool composed of a hard base material, such as cemented carbide, cermet, ceramic, and cubic boron nitride, and a hard coating film formed on the hard base material. A hard coating film for a cutting tool according to the present invention is formed in a multi-layered structure on a base material of a cutting tool, wherein the hard coating film includes one or more layers of a coating film made of an oxide and one or more layers of a coating film made of a nitride, and is characterized in that the O/(O+N) ratio in an edge center of the cutting tool is lower than the O/(O+N) ratio in a region 100 μm or further away from the edge center in the entire hard coating film.
Claims5
A hard coating film formed in a multi-layered structure on a base material of a cutting tool, wherein:
- the hard coating film includes one or more layers of a coating film made of an oxide and one or more layers of a coating film made of a nitride;
- and
- in the entire hard coating film, an O/(O+N) ratio in an edge center of the cutting tool is lower than an O/(O+N) ratio in a region 100 μm or further away from the edge center by 0.05 to 0.15.
Dependencies are inferred from the claim text.