首页|Fabrication of micro holes using low power fiber laser:surface morphology,modeling and soft-computing based optimization
Fabrication of micro holes using low power fiber laser:surface morphology,modeling and soft-computing based optimization
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Fiber laser micromachining is found extensive applications at industrial level because it is cheap and sim-ple to use.Due to its high strength and low conductivity titanium is difficult to machine with conventional methods.In this investigation,micro holes were fabricated using a 30 W fiber laser on 2 mm thick α-titanium(Grade 2)and the process parameters were optimized through response surface methodology(RSM)and teaching learning-based optimiza-tion(TLBO)approach.Experimental runs were designed as per rotatable central composite design(RCCD).Mate-rial removal rate(MRR),hole circularity(HC),deviation in diameter(DEV)and heat affected zone(HAZ)were selected as output.A third-order polynomial prediction model was established using RSM.Analysis of variance(ANOVA)sug-gested that the developed model was 93.5％accurate.The impact of input factors on responses were studied by 3D sur-face plots.RSM desirability indicates that optimum micro drilling conditions are scan speed 275.43 mm/s,frequency 24.61 kHz,power 36.23％and number of passes 49.75.TLBO indicates that optimum micro drilling conditions are scan speed 100 mm/s,frequency 20 kHz,power 20％and number of passes 50.Comparison between RSM and TLBO suggested that TLBO provided better optimization results.Surface morphology of the fabricated micro holes was ana-lyzed with scanning electron microscopy(SEM).
NETL
NSTL
万方数据
