Comparative Study on the Performance of Different Drill Bits for Drilling CFRP
In this work, experimental study was carried out to compare the machining performances of the three types of drills: (1) solid carbide drill, (2) diamond core drill, and (3) brad point bit for drilling CFRP. Comparative study of the performance of the tools was carried out in terms of delamination at hole entry and exit side. Experiment was conducted based on Taguchi’s orthogonal array technique. From the analysis of results, it is found that the performance of diamond core drill was better and resulted in lesser damages of holes. The lowest value for the delamination factor at entrance (1.093) and exit (1.101) was obtained at a spindle speed of 500 rpm, feed rate of 3 mm/min with the thrust force of 78 N. The use of diamond core drill is recommended for drilling CFRP in terms of economy and drilled hole quality.
KeywordsCFRP Drilling Delamination factor Fiber pull-out Cutting force
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