Surface coated cutting tool
AssigneesSumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.
InventorsHideki Moriguchi, Makoto Setoyama, Miki Miyanaga, Junya Okida, Sachiko Koike, Daiji Tabayashi
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Abstract
A surface-coated cutting tool of the present invention includes a substrate and a coated layer formed on the substrate, and the coated layer is a physical-vapor-deposition layer having a thickness of 10 μm or more. A surface region having a thickness of 1 μm from a surface of the coated layer includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress, and the integrated residual stress of the surface region falls within the range of −1.5 to 1.5 GPa in any region included in the surface region.
Claims20
A surface-coated cutting tool comprising:
- a substrate;
- and
- a coated layer formed on the substrate,
- wherein the coated layer is a physical-vapor-deposition layer having a thickness of 10 μm or more;
- wherein the coated layer has a surface region having a thickness of 1 μm from a surface of the coated layer, the surface region includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress;
- wherein the integrated residual stress of the surface region falls within the range of −1.5 to 1.5 GPa in any region included in the surface region, and
- wherein the surface region includes a region from the surface of the coated layer to a thickness of 0.3 μm or less that includes a point Z2, wherein the point Z2 indicates a point where the tensile stress on the surface side changes to a compressive stress as viewed from the surface side.
A surface-coated cutting tool comprising:
- a substrate;
- and
- a coated layer formed on the substrate,
- wherein the coated layer is a physical-vapor-deposition layer having a thickness of 10 μm or more;
- wherein the coated layer has a surface region having a thickness of 1 μm from a surface of the coated layer, the surface region includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress;
- wherein the integrated residual stress of the surface region falls within the range of −1.5 to 1.5 GPa in any region included in the surface region, and
- wherein the surface region of the coated layer includes a point, at a first depth of 0.3 μm or less from the surface of the coated region, at which the integrated residual stress changes from the tensile stress to the compressive stress.
Dependencies are inferred from the claim text.