Effect Of Drilling Parameters In Drilling Of Glass Fiber Reinforced Vinylester/Carbon Black Nanocomposites
R.M. Kulkarni, H. N. Narasimha Murthy, G.B.Rudrakshi, Sushilendra
Key words: DOE, S/N ratio, Grey relational analysis, SEM, GFRP
ABSTRACT: This paper focused on investigating the effects of drilling parameters like spindle speed (600rpm, 1860 rpm and 2700 rpm), Feed rate (0.1mm/rev, 0.2mm/rev and 0.3mm/rev), drill point angle (1180, 1100 and 900), drill material (HSS, Co-HSS and Tungsten Carbide) and carbon black (0, 4 and 8 wt %) on the responses: thrust force and delamination factor (entry and exit) in drilling of carbon black dispersed vinyl ester GFRP, by Design of Experiments approach. Drilling experiments were designed to control the drilling parameters based on L27Orthogonal Array. The experimental results were analyzed using MINITAB V16. Signal-to-Noise (S/N) ratio, ANOVA and Grey Relation Analysis (GRA) were employed to analyze the effect of drilling parameters on the quality of the drilled holes. Minimum value of thrust force was obtained for 4 wt% carbon black, 2700 rpm, 0.1 mm/rev, 1100 drill point angle and HSS drill. Delamination was minimum for 4 wt% carbon black, 2700rpm, 0.1mm/rev, 4mm diameter with Tungsten Carbide (WC) drill. SEM confirmed that delamination at the exit is greater than delamination at the entry.
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