Coated cutting insert and manufacturing method thereof
AssigneeSumitomo Electric Hardmetal Corp.
InventorsNaoya Omori, Yoshio Okada, Minoru Itoh, Susumu Okuno, Shinya Imamura
Life of this patent
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Abstract
A coated cutting insert according to the present invention includes a base layer formed on a substrate and an indicating layer formed on a part of the base layer. The indicating layer is formed on a flank face, on the base layer on the entire surface or a part of a region A2 except for a specific region A1, and on a rake face, on the base layer on the entire surface or a part of a region B2 except for a specific region B1. In the region A1 and the region B1, the base layer is exposed at the surface, and has compressive residual stress in one or both of the region A1 and the region B1.
Claims16
A coated cutting insert comprising:
- a substrate;
- a base layer formed on said substrate;
- and
- an indicating layer formed on a part of said base layer;
- wherein
- said substrate has at least one surface serving as a rake face and other at least one surface serving as a flank face, the rake face and the flank face continue to each other with a cutting edge lying therebetween,
- said base layer exhibits a color different from that of said indicating layer,
- said indicating layer is formed on said flank face, on said base layer on an entire surface or a part of a region A2 except for a region A1 extending from said cutting edge with a width of at least 0.2 mm to less than 4.0 mm, and on said rake face, on said base layer on an entire surface or a part of a region B2 except for a region B1 extending from said cutting edge with a width of at least 0.2 mm to less than 4.0 mm,
- in said region A1 and said region B1, said base layer is exposed at a surface, and at least one layer constituting the exposed base layer has compressive residual stress in one or both of said region A1 and said region B1, and
- said compressive residual stress is stress of which absolute value is at least 0.1 GPa.
A method of manufacturing a coated cutting insert including a substrate, a base layer formed on the substrate and an indicating layer formed on a part of the base layer, comprising the steps of:
- forming the base layer on the substrate;
- forming the indicating layer on said base layer, which has a color different from that of said base layer;
- and
- removing said indicating layer formed in a region on a flank face of said substrate, including at least a region A1 extending from a cutting edge with a width of at least 0.2 mm to less than 4.0 mm, and in a region on a rake face of said substrate, including at least a region B1 extending from said cutting edge with a width of at least 0.2 mm to less than 4.0 mm.
Dependencies are inferred from the claim text.