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Simulation Of Abrasive Particle Collisions During Submerged Polishing Of CVD Coated Hardmetal Turning Inserts

  • : Dominic Smit1, Natasha Sacks1
  • : 1School of Chemical & Metallurgical Engineering and DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand
  • : PDF Download
  • : 2016

Abstract

The focus of this research was to study the surface finish of CVD (chemical vapour deposition) coated cemented tungsten carbide turning inserts with the aim of potentially improving the operational lifespan of the insert. A submerged polishing machine was designed, manufactured and used to conduct the polishing tests. Alumina-based slurries of varying grit sizes were employed, with the insert subjected to full submergence during polishing. Sample movement was both rotational and linear. Fluid simulations and collision theory calculations were employed to provide a better understanding of the collisions occurring between the coating and the abrasive grits during polishing. Result analysis included SEM and EDS measurements, elemental mapping and surface roughness measurements to better understand the impact of this method of submerged polishing

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