Method of machining using coated cutting tools
AssigneeKennametal Inc.
InventorsAnakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal, Roger A. Baillargeon, William D. Ewald
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Abstract
Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains. The cutting tool has been found to be particularly useful in the machining of titanium alloys and superalloys.
Claims18
A method of machining titanium alloys and high temperature superalloys comprising the steps of:
- machining an alloy selected from the group consisting of titanium alloys and high temperature superalloys at a predetermined speed with a cemented carbide cutting tool having a refractory coating;
- wherein said refractory coating has an inner CVD layer and an outer PVD layer;
- and wherein said cemented carbide consists essentially of tungsten carbide grains bonded together by a binder selected from the group consisting of cobalt and cobalt alloys;
- and wherein said cobalt forms about 3 to 10 weight percent of said cemented carbide;
- and wherein said PVD layer has a residual compressive stress.
Dependencies are inferred from the claim text.