Seco Tools Ab

Stefan Ostlund

Jenni Zackrisson

Erik Sundstrom

Carlos Bueno Martinez

A cutting tool insert is formed from a cemented carbide body and a coating particularly useful in medium-rough to rough turning of stainless-steels and superalloys. The cemented carbide body is formed from cemented carbide with a composition of 7.0-12.0 wt-% Co, 5.0-11.0 wt-% cubic carbide forming metals from group IVb, Vb and VIb of the periodic table, preferably Ti, Nb and Ta, and balance WC with a 10-30 &#x3bc;m essentially cubic carbide phase free and binder phase enriched surface zone. The coating includes an MTCVD Ti(C,N) as the first layer adjacent the body having a thickness of from &#x3e;2.5 to 7.0 &#x3bc;m, on top of which an &#x3b1;AlOlayer is present, with a thickness of between 2.0 and 5.0 &#x3bc;m, and a total thickness of the coating of between 5.5 and 9.5 &#x3bc;m. The alumina layer has a (006) texture.

Coated cutting tool for medium-rough to rough turning of stainless steels and superalloys

The present invention relates to a cutting tool insert comprising a cemented carbide body and a coating particularly useful in fine to medium-rough turning of stainless-steels. The cemented carbide body consists of a cemented carbide with a composition of 5.0-9.0 wt-% Co, 5.0-11.0 wt-% cubic carbide forming metals from group IVb, Vb and VIb of the periodic table, preferably Ti, Nb and Ta, and balance WC with a 10-30 &#x3bc;m essentially cubic carbide phase free and binder phase enriched surface zone. The coating comprises an MTCVD Ti(C7N) as the first layer adjacent the body having a thickness of from 2.5 to 7.0 &#x3bc;m, on top of which an &#x3b1;-AlOlayer is present, with a thickness of between 2.0 and 5.0 &#x3bc;m, and a total thickness of the coating between 5.5 and 9.5 &#x3bc;m. The alumina layer has a (006) texture.

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Fagersta, Sweden

Stefan Ostlund