Surface-coated cutting tool and method for manufacturing the same
AssigneeSumitomo Electric Hardmetal Corp.
InventorsShinya Imamura, Hideaki Kanaoka, Anongsack Paseuth, Satoshi Ono, Kouhei Yoshimura
Life of this patent
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Abstract
A surface-coated cutting tool includes a base material and a coating formed on the base material. The base material is a cemented carbide or a cermet. A surface of the base material includes a rake face, a flank face, and a cutting edge face connecting the rake face to the flank face. The base material has an oxygen concentration of less than or equal to 1 at. % at a depth position of 0.4 μm from the cutting edge face. The coating includes a hard layer. A topmost layer in the hard layer has a compressive stress of more than or equal to 1.5 GPa in absolute value.
Claims7
A surface-coated cutting tool comprising a base material and a coating formed on the base material,
- the base material being a cemented carbide or a cermet,
- a surface of the base material including a rake face, a flank face, and a cutting edge face connecting the rake face to the flank face,
- the base material having an oxygen concentration of less than or equal to 1 at. % at a depth position of 0.4 μm from the cutting edge face,
- the coating including a hard layer,
- a topmost layer in the hard layer having a compressive stress of more than or equal to 1.5 GPa in absolute value.
Dependencies are inferred from the claim text.