Study on Machinability Behaviour and Simultaneous Optimisation of Multiple Responses Using Taguchi‐Based Grey Relational Analysis in End Milling of Aluminum Hybrid Composites

The present work reveals the machinability characteristics of Al7068/Si 3 N 4 /BN hybrid composite materials. The composite materials were prepared through the liquid metallurgy technique with various weight fractions (0, 5, 10) of silicon nitride and hexagonal boron nitride particles. The experimental studies were performed on a CNC milling machine by varying cutting speed (600, 1200 and 1800 rpm), feed rate (150, 300 and 450 mm/min), and depth of cut (0.8, 1.2 and 1.6 mm). Taguchi’s plan of experiments ( L 27 orthogonal array design) and analysis of variance (ANOVA) were employed to investigate the effect of process parameters on surface roughness (Ra), cutting temperature, and material removal rate (MRR). Taguchi‐based grey relational analysis (GRA) was performed to identify the best process parameters combination for optimising the multiple responses simultaneously. ANOVA results revealed that the weight fraction of Si 3 N 4 is the most contributing parameter for multiple response characteristics.