Abstract
SUMMARY This paper presents a comparison of the performance characteristics of titanium nitride (TiN) and zirconium nitride (ZrN) coatings on drills. The objective of this work was two-fold: to choose the best coating for machining tough materials tike Hasteloy; and to determine a method of predicting the wear of drills. A longer life of drills leads to increased productivity of drilling holes in certain components of environmental-control systems and fuel-control assemblies (in the aerospace industry) made of tough materials like Hasteloy. The comparison of the two coatings and tool wear was based on the measurement of static and dynamic forces and torques, power spectral density and acoustic-emission plots. The measurements were carried out using piezoelectric dynamometers and an acoustic-emission device. Upon analysis of the data, it was found that drills coated with TiN performed better than those coated with ZrN. It was also observed that the root-mean-square value of the acoustic-emission density an...
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