Cutting tool insert

Details Cutting tool insert Cutting tool insert

2007-06-19

2007-06-19

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C427S419100, C427S419200, C427S419700, C428S336000, C428S472000, C428S325000, C428S697000, C428S698000, C428S701000, C428S702000

Reexamination Certificate

active

11133173

ABSTRACT:
The present invention relates to a cutting tool insert for side and face milling of rolled low alloyed steel at low and at moderate cutting speeds comprising a cemented carbide body and a coating and a method for making same. The cemented carbide body comprises WC, from about 7.3 to about 7.9 wt-% Co and from about 1.0 to about 1.8 wt-% cubic carbides of Ta and Nb and a highly W-alloyed binder phase with a CW-ratio of from about 0.86 to about 0.94. The coating comprises:a first (innermost) layer of TiCxNyOzwith a thickness of from about 0.1 to about 2 μm, and with equiaxed grains with size less than about 0.5 μma layer of TiCxNyOzwith a thickness of from about 2 to about 10 μm with columnar grains with a diameter of about less than about 5 μma layer of TiCxNyOzwith a thickness of 0.1-2 μm and with equiaxed or needlelike grains with size less than about 0.5 μman outer layer of a smooth, textured, finegrained α-Al2O3layer with a thickness of from about 2 to about 10 μm.The invention also relates to the use of such a cutting tool insert for side and face milling of rolled low alloyed steel at low and moderate cutting speeds.

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