Surface-coated cutting tool with coated film having strength distribution of compressive stress
AssigneesSumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.
InventorHideki Moriguchi
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Abstract
A surface-coated cutting tool according to the present invention includes a base material and a coated film formed on the base material. The coated film serves as an outermost layer on the base material and has compressive stress. The compressive stress is varied so as to have strength distribution in a direction of thickness of the coated film. The strength distribution is characterized in that the compressive stress at a surface of the coated film continuously increases from the surface of the coated film toward a first intermediate point located between the surface of the coated film and a bottom surface of the coated film and the compressive stress attains a relative maximum point at the first intermediate point.
Claims32
A surface-coated cutting tool, comprising:
- a base material;
- and
- a coated film formed on said base material;
- wherein
- said coated film serves as an outermost layer on said base material and has compressive stress,
- said compressive stress is varied so as to have strength distribution in a direction of thickness of said coated film, and
- said strength distribution is characterized in that the compressive stress at a surface of said coated film continuously increases from said surface of said coated film toward a first intermediate point located between said surface of said coated film and a bottom surface of said coated film and the compressive stress attains a relative maximum point at said first intermediate point.
Dependencies are inferred from the claim text.