Coated cemented carbide insert

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Reexamination Certificate

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C051S307000, C051S309000, C428S336000, C428S628000, C428S701000, C428S702000

Reexamination Certificate

active

07153562

ABSTRACT:
The present invention relates to a cutting tool insert particularly for turning of steel comprising a cemented carbide body, a coating with a post treatment witha first, innermost layer system of one or several layers of TiCxNyOzwith x+y+z≦1 with a total thickness of 0.7–4.5 μma second multilayer system consisting of a totally 5–31 alternating Al2O3and TiCxNyOz(x+y+z≦1), preferably κ-Al2O3and TiN, the Al2O3-layers having an individual layer thickness of <0.5 μm and the TiCxNyOz-layers 0.01–0.2 μm with a total thickness of the multilayer of 1.0–4.0 μm. The multilayer is exposed along the edge line and into the rake and flank face, at least 0.02 mm, from the edge line on the rake face, preferably the contact length of the chip at most 0.9 mm, and 0.02–0.20 mm on the flank face.

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Swedish Office Action dated Jul. 16, 2003.
K. Dreyer et al., “Development and tool like behaviour of super-wear-resistant multilayer coatings on hardmetals,” pp. 112-117.
S. Ruppl et al., “Microstructure and deposition characteristics of κ-Al2O3,”J. Phys. IV France9 (1999), pp. 349-355.

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