EXPERIMENTAL ANALYSIS ON DRILLING OF GLASS FIBER REINFORCED PLASTICS (GFRP) MANUFACTURED BY HAND LAY-UP
Keywords:
GFRP, Delamination, Feed rate, Cutting speed, Drill diameter, ANOVA , TaguchiAbstract
Drilling of glass fibre reinforced plastic (GFRP) composite is substantially different from metallic materials due to its mechanical properties. The drilling of this material may generate delamination of drilled holes on the workpiece. The purpose of this paper is to investigate the influence of the drilling parameters, such as cutting speed, feed rate and drill diameter on delamination produced when drilling a GFRP composite. Drilling is a frequently practiced machining process in industry due to the need for component assembly in mechanical pieces and structures. Hence it is essential to obtain optimum drilling parameters minimizing delamination at drilling of GFRP composites. A plan of experiments, based on the techniques of Taguchi, was established considering drilling with prefixed cutting parameters in a hand lay-up GFRP material. The analysis of variance (ANOVA) was performed to investigate the drilling characteristics of GFRP’s using twist drills with appropriate geometries. The optimum drilling parameter combination was obtained by using the analysis of signal-to-noise ratio.
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