Abstract
The present work utilizes the CNC-controlled microwave drilling technique to produce the holes in kenaf-reinforced polypropylene composites. The influence of microwave power and feed rate on the hole characteristics, namely, circularity, overcut, taper angle, and surface roughness was investigated. Stereo microscopic images of the hole entrance and exit were used to evaluate the circularity, overcut and taper angle. Optical profilometer was used to acquire the surface roughness of drilled holes. The TOPSIS, GRA, and MOORA multi-criteria decision making techniques were implemented to optimize the microwave drilling process parameters. The 180 W of microwave power and 145 mm/min of the feed rate were the optimum process parameters to yield the best quality holes in kenaf-reinforced polypropylene composites.
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