Sandvik Ab

&angst;ke &Ouml;stlund

Jeanette Persson

Leif &angst;kesson

Rickard Sundstr&ouml;m

Per Gustafson

Bj&ouml;rn Ljungberg

Mats Waldenstr&ouml;m

Per Lindskog

Ove Alm

A coated milling insert particularly useful for milling in low and medium alloyed steels with or without abrasive surface zones during dry or wet conditions at high cutting speed, and milling hardened steels at high cutting speed. The insert is characterized by a WC-Co cemented carbide with a low content of cubic carbides and a highly W-alloyed binder phase and a coating including an innermost layer of TiC N O with columnar grains and a top layer of TiN and an inner layer of &kgr;-Al O .

Coated milling insert

There is disclosed a method of sintering cemented carbide bodies including heating said bodies to the sintering temperature in a suitable atmosphere and cooling. If said cooling at least to below 1200&deg; C. is performed in a hydrogen atmosphere of pressure 0.4-0.9 bar cemented carbide bodies with no surface layer of binder phase are obtained. This is an advantage when said bodies are to be coated with wear resistant layers by the use of CVD-, MTCVD- or PVD-technique.

Sintering method

A coated cemented carbide cutting tool (indexable inserts) for the wet or dry milling, particularly at high cutting speeds, of stainless steels of different composition and microstructure, but also for the milling of non-stainless steels such as low carbon steels and low and medium alloyed steels is disclosed. The coated WC&minus;Co based cemented carbide insert includes a specific composition range of WC&plus;Co without any addition of cubic carbides by a low W-alloyed Co binder and by a narrow range defined average WC grainsize, and a hard and wear resistant coating including a multilayered structure of sublayers of the composition (Ti,Al,)N with repeated variation of the Ti/Al ratio.

Cemented carbide insert for turning, milling and drilling

A coated turning insert particularly useful for turning in stainless steel is disclosed. The insert is characterized by a WC&mdash;Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a coating including an inner layer of TiC,N,O,with columnar grains followed by a layer of fine-grained &kgr;-Al,O,and a top layer of TiN. The layers are deposited by using CVD-methods.

Growing community of inventors

Hägersten, Sweden

&angst;ke Östlund

Growing community of inventors

Hägersten, Sweden

&angst;ke &Ouml;stlund

&angst;ke Östlund