Laminated Carbide Cutting Tool Insert

The insert has a cemented metal carbide core containing a majority of tungsten carbide and possibly other metal carbides bonded with an iron group metal, e.g. cobalt, nickel or iron providing a tough, deformation resistant material which can withstand the stresses of machining.

The core material has a thin layer of crater-resistant cemented carbide disposed on the rake face thereof, said crater-resistant layer containing tungsten carbide and substantial amounts of a carbide of a metal chosen from Groups IVb and Vb of the periodic table, the percentage of the Group IVb and Vb carbides is greater in the crater-resistant layer than in the core material. A thin coating of hard surface material coated on the composite substrate's rake face and flanks provides a coated, laminated structure which is resistant to cratering, flank wear and deformation even under high speed machining conditions.


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