ANALYSIS OF THE DISC DRESSING EFFECTS ON GRINDING PERFORMANCE - PART 2: EFFECTS OF THE WHEEL TOPOGRAPHICAL PARAMETERS ON THE SPECIFIC ENERGY AND WORKPIECE SURFACE ROUGHNESS

摘要

This article is the second of two parts which analyze and simulate the disc dressing process and its effect on grinding performance. In the first part a new stochastic model of the prediction of wheel topography by diamond disc dresser was developed. It predicted the number of active cutting points per unit area and average slope of the asperities on an alumina grinding wheel. In the second part the effects of a disc dressing parameter which affect the wheel topography, specific energy, and workpiece surface roughness are evaluated. An upper bound analysis of a pyramidal indenter which moves on the workpiece is used for evaluation of the specific energy and modification of the grain tip. Modified grain tip was then used to predict the surface roughness of the ground workpiece. Dressing conditions with various speed ratios, cross feed rates and depths of dressing were investigated. In each case, the grinding forces and the surface roughness were experimentally measured, and then the effect of changing dressing parameters on the grinding performance was analyzed.