Patent ID: 7871715
Filing Date: 2011-01-18
Classification: B22F,C22C,C23C,Y02T,Y10T

Abstract:
1. A surface-coated cutting insert comprising: an insert body having a substrate of tungsten carbide-based cemented carbide, titanium carbonitride-based cermet or ceramics; and a base layer, an intermediate layer and an outermost layer which are provided on a surface of the insert body, in order from the insert body side, wherein a cutting edge is formed at an intersecting edge line region where a rake face and a flank face of the insert body intersect, wherein the base layer and the outermost layer are made of a single layer or two or more layers formed of carbides, nitrides, oxides, or borides of one selected from the group consisting of periodic table Group IVa metals, Group Va metals, Group VIa metals, aluminum and silicon, or complex compounds thereof, and the intermediate layer is formed of primarily Al wherein the outermost layer is removed so as to leave primarily the intermediate layer exposed on at least the flank face and a flank face-side cutting edge portion of the intersecting edge line region that is connected to the flank face, with the outermost layer being left on at least part of the rake face inside a boundary with the intersecting edge line region and wherein the intermediate layer is exposed on 70% or more of the surface area of the flank face.