Cutting tool and tool with holder
AssigneeNgk Spark Plug Co., Ltd.
InventorHideki Kato
Life of this patent
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Abstract
A cutting tool 1 includes a hard coating formed on the surface of a substrate formed of, for example, a hard material of cemented carbide (WC-Co-type cemented carbide) equivalent to JIS K10 and polished into the shape of ISO SPGN120312. The cutting tool 1 has a plate-shape with a rake face (the main surface side) that is wider than the opposite face. The hard coating has a thickness in the range of from 1 μm to 5 μm, is formed of a TiAlN material, and has a Ti/Al ratio of 1. Coarse grains present in the hard coating and having a size not less than coating thickness occupy an area percentage not greater than 5% by area. The hard coating has a surface roughness Ra of not greater than 0.1 μm and a surface roughness Rz of not greater than 1 μm.
Claims8
A cutting tool comprising:
- a substrate;
- and
- a TiAlN coating formed on the substrate,
- wherein the coating has a thickness in the range of from 1 to 5 μm, and coarse grains present in the coating and having a size that is not less than the thickness of the coating occupy not greater than 5% of the surface area of the coating.
Dependencies are inferred from the claim text.