Abstract
Summary Results of experimental investigation into the tool life scatter which occurs in face milling with titanium nitride mated high speed steel indexible inserts are presented and discussed. The tools investigated were coated under closely controlled conditions using Physical Vapour Deposition (PVD) technology. The scatter between the four corners of a single indexible insert was found to be very significant. Many important questions in relation to substrate preparation for coating, mating process conditions and method of cutting tool implementation in the machining process arise as a result of the analysis undertaken. It is shown that the orientation, location and method of fixing of the cutting took in the coating chamber effect the tool life scatter.
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