Abstract: An indexable cutting insert is disclosed in which, an insert body is formed into a polygonal plate-like shape when viewed from the front, and has a cutting face and a flank face. In the insert body, a cutting edge is formed at an intersection of the cutting face and the flank face. The cutting face is formed into an inclined face downsloped toward the inner side of the front face of the insert body. A breaker face is formed on the front face connected with the cutting face. The breaker face projects outwardly in the direction of the thickness of the insert body with respect to the extended plane stemming from the cutting face. On the cutting face, protrusions projecting out from the cutting face are formed, and when viewed from the front, extend towards the inner side from the periphery of the insert body. The protrusion has a ridge portion, which extends perpendicular to the direction of the thickness of the insert body.

Abstract: A surface-coated blade member for cutting tools comprises a metal substrate of a super hard alloy and a coating on at least one surface of said substrate, said coating being composed of a layer of vapor deposited titanium on the surface of said metal substrate and at least one layer of vapor deposited titanium compound on said layer of titanium, and said layer of titanium compound being selected from the group consisting of titanium carbide, titanium nitride, titanium carbo-nitride, titanium oxy-carbide and titanium oxy-carbo-nitride, said layer of titanium being no larger than 2 .mu.m thick and said layer of titanium compound being 0.5 to 10 .mu.m thick.

Abstract: A sputtering apparatus for coating by the use of a target cathode within a vacuum chamber an article to be treated which is held on an article holding means within the vacuum chamber. The target cathode is of a tubular skeleton structure and is disposed so as to surround the article holding means.

Abstract: The surface-coated blade member for cutting tools comprises a metal substrate and a coating on at least one surface of said substrate, said coating composed of a layer of vapor deposited titanium on the surface of said metal substrate and at least one layer of vapor deposited titanium compound on said layer of titanium, and said layer of titanium compound being selected from the group consisting of titanium carbide, titanium nitride, titanium carbonitride, titanium oxy-carbide and titanium oxy-carbo-nitride, said layer of titanium being no larger than 2 .mu.m thick and said layer of titanium compound being 0.5 to 10 .mu.m thick. A process for producing such a blade member is also disclosed.