US RE40,025 E1
Coated grooving or parting insert and method of making same
Anders Jonsson, Gävle (Sweden); Anders Piirhonen, Sandviken (Sweden); Torbjörn Selinder, Stockholm (Sweden); and Gregor Kullander, Älvsjö (Sweden)
Assigned to Sandvik Intellectual Property AB, Sandviken (Sweden)
Filed on Jun. 08, 2006, as Appl. No. 11/449,012.
Application 11/449012 is a reissue of application No. 09/652026, filed on Aug. 31, 2000, now 6,342,291, filed on Jan. 29, 2002.
Int. Cl. B32D 9/00 (2006.01)
U.S. Cl. 428—216  [51/307; 51/309; 428/325; 428/336; 428/467; 428/472; 428/697; 428/698; 428/699] 7 Claims
OG exemplary drawing
 
1. A cutting tool comprising:
a cemented carbide body comprising WC with an average grain size of about 1.4 μm, 12-13 wt-% Co, 0.4-1.8 wt-% TaC+NbC, and a low W-alloyed binder phase with a CW-ratio of 0.82-0.91; and
a coating comprising:
a first innermost 0.1-0.5 μm thick layer of TiN;
a second layer comprising a multilayered structure of 0.05-0.2 μm thick sublayers of a composition (TixAl1-x)N in which x varies repeatedly between the two ranges 0.45<×<0.55 and 0.70<×<0.80, a first sublayer of (TixAl1-x)N adjacent to the TiN bonding layer having an x-value of 0.45<×<0.55, a second sublayer of (TixAl1-x)N having an x-value of 0.70<×<0.80 and a third sublayer having x of 0.45<×<0.55, the sequence of sublayers alternating and repeating until 12-25 sublayers are built up;
a third 0.1-0.5 μm thick layer of (TixAl1-x)N, where x is 0.45<×<0.55; and
a fourth outermost 0.1-0.2 μm layer of TiN;
wherein the total coating thickness is 1-8 μm and the thickness of the second layer constitutes 75-95% of the total coating thickness.