Surface-coated cutting tool
AssigneeSumitomo Electric Hardmetal Corp.
InventorsYoshio Okada, Naoya Omori, Minoru Itoh, Norihiro Takanashi, Shinya Imamura, Susumu Okuno
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Abstract
A surface-coated cutting tool comprising a substrate, and a coating formed thereon, characterized in that the coating includes a first coating containing TiCN and a second coating containing α-type Al2O3, the first coating is interposed between the substrate and the second coating, and the second coating has compressive stress S1 on the rake face and tensile stress S2 on the flank face, with the compressive stress S1 and the tensile stress S2 being defined by the following expression; 441 MPa≦|S1−S2|≦3500 MPa.
Claims8
A surface-coated cutting tool comprising:
- a substrate;
- and
- a coating formed on said substrate, wherein
- said coating includes a first coating containing TiCN and a second coating containing α-type Al2O3,
- said first coating is located between said substrate and said second coating and has tensile stress, or is released from tensile stress to substantially have no stress, and
- said second coating has compressive stress S1 on a rake face and tensile stress S2 on a flank face, with said compressive stress S1 and said tensile stress S2 defined by the following expressions (I) and (I)′:
- 441 MPa≦|S1−S2|≦3500 MPa (I)
- |S1|>441 MPa (I)′.
Dependencies are inferred from the claim text.