Multi-objective Optimization of CNC Drilling Parameters on Machining of HcHcr Steel Using Taguchi’s Technique and Grey Relational Analysis

Abstract

AbstractIn this present research paper, multi-objective optimization of CNC Drilling parameters on machining of HcHcr steel using Taguchi’s and GRA and work considered four input parameters (point angles, spindle speeds, feed rates, drills diameter) and two output parameters (surface roughness, delamination). Initially, experimentation is carried out using Taguchi’s (L27) orthogonal array, and multi-objective optimization is done with Taguchi’s based grey relational analysis. HSS twist drills are used for machining. Additionally, comparative analysis is carried out between single objective and multi-objective optimization technique and the result shows optimum combinations of drilling parameters using Taguchi’s method are 136° point angle (A3); 2700 RPM spindle speed (B3); 80 mm/min feed rate (C1) and 10 mm drill diameter (D2), i.e., A3B3C1D2 for surface roughness and 136° point angle (A3); 2700 RPM spindle speed (B3);80 mm/min feed rate (C1) and 10 mm drill diameter (D3), i.e., A3B3C1D3 for delamination. Furthermore, ANOVA analysis carried out to determine significant CNC drilling parameters and results shows spindle speeds (42.296%) is most significant process parameter used for surface roughness (SR) followed by feed rates (28.930%), drill diameters and point angles; spindle speed (64.4247%) is most significant parameter for delamination subsequently feed rates (19.832%) drill diameters and point angles and spindle speed (60.095%) is most significant for multi-objective optimization subsequently feed rates (26.94%) drills diameter and point angles.KeywordsDrillingTaguchi’s methodOptimizationGRAANOVA