THE OPTIMIZATION OF SURFACE ROUGHNESS OF AZ91D MAGNESIUM ALLOY USING ANOVA IN BALL BURNISHING PROCESS

Abstract

Ball burnishing is a simple, cost-effective and fast finishing process generally applied to better the surface roughness of machine parts. In this study, the Taguchi L18 orthogonal array method is used to find the optimal surface roughness in ball burnishing of AZ91D magnesium alloy. The orthogonal array, the signal-to-noise ratio, and ANOVA (analysis of variance) method is employed to study the performance characteristics in ball burnishing process of AZ91D alloy bars. The purpose of this study is to perform an ANOVA to determine the effects of the (burnishing force, burnishing speed, feed rate and number of passes parameters) on the surface roughness data obtained after the ball burnishing applied to the AZ91D bars. The optimum burnishing parameter was determined based on signal-to-noise (S/N) ratio. Data was analyzed by means of the ANOVA method. The main results of the statistical analysis highlight the great influence of the feed rate, burnishing force and number of passes on surface roughness among the set of factors and their interactions considered.