DRILLING INDUCED ROUGHNESS ANALYSES USING TAGUCHI METHOD

Carbon fiber reinforced polymer (CFRP) composite is finding wide application in every field of engineering as they offer a great blend of quality, low weight and high modulus. It is well known that drilling is one of the most commonly used machining operations in CFRP composite for structural assemblies. The viability of drilling activity is based on surface roughness of the drilled holes. Thus, the present study aims to analyze the surface roughness while drilling of bi-directional carbon fiber reinforced polymer (BD CFRP) composites fabricated with and without nano particles. The BD CFRP composite laminates are made by hand-layup technique followed by Vacuum bagging for 24 hours. Taguchi L27 orthogonal array is utilized for conducting drilling experiments and Taguchi method is likewise chosen for predicting the qualities of the holes drilled by TiN coated carbide drills. The outcome of the study demonstrates that there is a good correlation between the experimental and the predicted results of surface roughness. The outcome of the study also demonstrates that the most extreme effect on surface roughness is because of drill diameter, followed by spindle speed, feed rate and point angle. The analysis of the study reveals that drill diameter of 4 mm, spindle speed of 3000 rpm, feed rate of 10 mm/min and point angle of 90° are the ideal machining parameters for least surface roughness.