Patent ID: 7875316

Claim:
A method for manufacturing a surface-coated cutting insert, comprising the steps of: forming a cutting edge at an intersecting edge line region where a rake face and a flank face intersect on an insert body having a substrate of tungsten carbide-based cemented carbide, titanium carbonitride-based cermet or ceramics; coating a surface of the insert body with, in order from the insert body side, a base layer, an intermediate layer and an outermost layer such that the base layer and the outermost layer are 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 2 O 3 ; and removing the outermost layer by wet blasting so as to leave primarily the intermediate layer exposed on part of the surface of the insert body, including at least the flank face and at least a flank face-side cutting edge portion of the intersecting edge line region that is connected to the flank face, but excluding at least part of the rake face inside a boundary with the intersecting edge line region, wherein the intermediate layer is exposed on 70% or more of the surface area at the flank face.