Abstract
ABSTRACTCutting tool inserts have been fabricated using alumina with different amounts of silverby conventional powder metallurgical route. The machining performance of thesecomposite inserts vis-a-vis that of commercial zirconia toughened alumina inserts havebeen evaluated by dry turning operations on steel bars under a wide range of cuttingparameters. The experiments consisted of measurement and examinations of the staticand the dynamic components of the cutting force spectra, flank wear of the tool, surfaceroughness on the work piece, and chip morphology. Analyses of the fluctuations in thedynamic force spectra using a new approach based on a quasi-fractal model have beenused to reveal the potential of different tool materials with respect to their cuttingperformance. Examinations and pertinent discussion of the operative wear mechanismsduring machining by the developed composites vis-a-vis their structure-propertyrelations are some essential supplements of this investigation.
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