Coated cutting tool insert

Details Coated cutting tool insert Coated cutting tool insert

2011-03-01

2011-03-01

Turner, Archene (Department: 1784)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C051S307000, C051S309000, C428S325000, C428S336000, C428S472000, C428S698000, C428S701000, C428S702000, C427S419100, C427S419200, C427S419700

Reexamination Certificate

active

07897247

ABSTRACT:
The present invention discloses coated cutting tool inserts particularly useful for turning of nodular cast iron preferably at high speeds, comprising a cemented carbide substrate comprising from about 5 to about 9 wt-% Co and from about 1 to about 5 wt % cubic carbides and balance WC of 86-94 wt-%, and a coating comprising a first layer of TiCxNyOzwith equiaxed grains, a layer of TiCxNyOzwith a thickness of less than about 10 to about 15 μm with columnar grains, a layer of TiCxNyOzwith a thickness of from about 0.1 to about 2 μm and with equiaxed or plate-like grains, a layer of α-Al2O3with thickness from about 3 to about 8 μm, an outer layer of a multilayered structure of TiN+TiC with TiC being the outermost layer and a total thickness of from about 0.5 to about 2 μm and wherein the outer coating layer has been removed in the edge line and on the rake face so that the α-Al2O3layer is on top along the cutting edge line and on the rake face and the outer TiC layer is the top layer on the flank face.

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