Sandvik Ab

Sandvik Intellectual Property Ab

Gregor Kullander

Anders Piirhonen

Anders Jonsson

Ingrid Reineck

Torbj&ouml;rn Selinder

Torbjörn Selinder

Helene S Brandrup-Wognsen

The present invention relates to a coated cutting tool (e.g.&#x2014;cemented carbide insert) useful for grooving or parting of steel or stainless steel components such as tubes and bars. The insert is characterised by a WC-Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a hard and wear resistant coating including a multilayered structure of sublayers of the composition (TiAl)N with a periodic and repeated variation of the Ti/Al ratio.

Coated grooving or parting insert and method of making same

The present invention relates to a coated cutting tool insert useful for grooving or severing steel components such as steel or stainless steel tubes and bars. The insert is characterized by WC&#x2014;Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a relatively thin coating including an inner layer of TiCNOwith columnar grains followed by a layer of fine grained &#x3ba;&#x2014;AlOand a top layer of TiN.

Coated grooving or parting insert

A method of making a cutting tool, the cutting tool having a WC&mdash;Co based cemented carbide body and a multi-layer coating, the method including: applying a first innermost bonding layer TiN to the body; applying a second layer in the form of a multilayered structure having sublayers of (Ti Al )N where x varies according to 0.45<x<0.55 and 0.70<x<0.80; applying a third layer of (Ti Al )N where x is 0.45<x<0.55; and applying a forth outermost layer on TiN.

Method of making grooving or parting insert

The present invention relates to a coated cutting tool (e.g.&mdash;cemented carbide insert) useful for grooving or parting of steel or stainless steel components such as tubes and bars. The insert is characterised by a WC-Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a hard and wear resistant coating including a multilayered structure of sublayers of the composition (Ti Al )N with a periodic and repeated variation of the Ti/Al ratio.

The present invention relates to a coated cutting tool insert useful for grooving or severing steel components such as steel or stainless steel tubes and bars. The insert is characterized by WC&mdash;Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a relatively thin coating including an inner layer of TiC,N,O,with columnar grains followed by a layer of fine grained &kgr;&mdash;Al,O,and a top layer of TiN.

There is now provided a body of cemented carbide, Si.sub.3 N.sub.4 or another ceramic material, coated by at least one CVD or PVD diamond or cBN layer with a chromium nitride, chromium carbide or chromium carbonitride layer. The chromium-containing layer is outside the diamond layer which in the case of more than one diamond layer is the outermost diamond layer of the coating. Improved machining properties are obtained.

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Älvsjö, Sweden

Gregor Kullander