Abstract
Taguchi methods have been in use for a long time to improve the performance of industrial equipment and product quality. In this study, Taguchi methodology has been used for the simultaneous optimization of hole taper (HT) and hole circularity (HC) during laser beam drilling (LBD) of carbon fiber-reinforced plastics (CFRP) of different thicknesses. Experiments were conducted based on the L9 orthogonal array using pulse current, pulse width, assist gas pressure and thickness as input parameters. Multiple signal-to-noise ratios (MSNRs) were used as an index for the multi-objective optimization. Optimum level of input parameters and its contribution on overall hole quality have been identified. It has been observed that thickness and pulse width are the two most critical factors for hole geometry during LBD of CFRPs. The robust method of Taguchi can be conveniently used for multi-objective optimization of LBD of CFRP, and it increases the HC by 35.45% and decreases the HT by 3.01 percent.
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