Sandvik Ab

ANGsa Kutscher

Bjorn Ljungberg

Anders Lenander

Leif Kesson

Kenneth Westergren

Staffan Soderberg

An oxide coated cutting tool including a body coated with refractory single- or multilayers one of which consists of single-phase .kappa.-Al.sub.2 O.sub.3 characterized by controlled microstructure with crystal planes preferably grown in the (210)-direction with respect to the exposed sure of the coated body. The oxide coated cutting tool exhibits increased wear properties when machining ball bearing steel.

Oxide coated cutting tool with increased wear resistance and method of

There is disclosed a coated cutting insert particularly useful for cutting in cast iron materials. The insert is characterized by a straight WC-Co cemented carbide body having a highly W-alloyed Co binder phase, a well-defined surface content of Co and a coating including an innermost layer of TiC.sub.x N.sub.y O.sub.z with columnar grains, a layer of a fine-grained, textured Al.sub.2 O.sub.3 layer and a top layer of TiC.sub.x N.sub.y O.sub.z that has been removed along the cutting edge line.

Coated cutting insert

There is provided a coated cutting insert particularly useful for finishing operations in milling of grey cast iron. The insert has a fine-grained WC-Co cemented carbide body and a coating of multiple layers of TiC.sub.x N.sub.y deposited at conditions aiming to minimize the decarburization of the cutting edge without any negative effects on the substrate. There is also disclosed a method of applying a TiC.sub.x N.sub.y layer by CVD technique on a cemented carbide cutting insert without eta phase formation and without etching of the binder phase.

An oxide coated cutting tool including a body coated with refractory single- or multilayers one of which consists of single-phase .kappa.-Al.sub.2 O.sub.3 characterized by controlled microstructure with crystal planes preferably grown in the (210)-direction with respect to the exposed surface of the coated body. The oxide coated cutting tool exhibits increased wear properties when machining ball bearing steel.

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Alvsjo, Sweden

ANGsa Kutscher