Experimental Investigation and Optimization in Edge Milling of NEMA G-11 GFRP/Epoxy Composites

摘要

NEMA (National Electrical Manufacturers Association)standard G-l 1, glass fiber reinforced plastic (GFRP /Epoxy) composite is an excellent insulating material for transformer and inductive appliances. This studyfocuses on an effective approach for the optimization of edge milling parameters with multiple performance characteristics based on Grey-Taguchi method. LI8 orthogonal array has been used for planning the experiments. Four cutting parameters selected for this investigation are milling strategy, spindle speed, feed rate and depth of cut. Resultant machining force F, delamination factor DF and surface roughness parameter Ra are the chosen output performance measures. From the response table of the average grey relational grade (GRG), it is found that the largest value of the GRG is for the up milling, spindle speed is of 1500 rpm, feed rate of 200 mm/min and depth of cut 0.2 mm. Milling strategy and feed rate has the most dominant role in influencing the surface roughness.