Abstract
The objective of this experimental study is to determine the influence of laser drilling parameters on a flat AISI 304 stainless steel sheet of 1mm thickness with pulsed Nd:YAG laser machining system. Taguchi’s L25 orthogonal array is used for the experimental design. The machining process parameters such as Lamp current, Pulse frequency, Air pressure and Pulse width are optimized with heat affected zone and hole taper parameters. Grey Relational Analysis (GRA) is used to solve such correlated multi-attribute optimization of drilling operation. The optimal setting parameters for multiple performance characteristics is lamp current at level-1, pulse frequency at level-5, air pressure at level-4 and pulse width at level-5 i.e., l1-f5-p4-W5. The Analysis of Variance (ANOVA) technique is carried out to check the significance of the models and observed that the lamp current, pulse frequency and air pressure are significant at 95% confidence level. Finally in the confirmation test, it is observed that the grey relational grade is improved from initial process parameter combination.
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