Multi-Performance Characteristics Optimisation for Titanium 6Al-4V ELI Using Taguchi and Weighted Utility Function
Keywords:
Multi-Performance Characteristics Optimisation, Titanium 6Al-4V ELI, Taguchi Method, Weighted Utility Function, Wire-cut EDM, Cutting Rate, Residual Stress, Micro-hardness.Abstract
In the present study, a multi-response optimisation method based on the weighted utility concept is proposed for wire-cut electrical discharge machining of Titanium 6Al-4V ELI alloy. The machining attributes being explored are cutting rate, residual stress and micro-hardness of the machined surface. In this examination, Taguchi and Utility Function design of experimentation is arranged and executed as a robust design methodology. The investigation indicated that the utility function of cutting rate, residual stresses, and micro-hardness increases with increasing peak current and gap voltage, whereas it decreases with increasing wire feed rate and flushing pressure. Out of the six selected controllable parameters, the significant contributors to the overall utility function of the proposed alloy machining are flushing pressure, Peak current, Gap voltage, Duty cycle, and Wire feed rate. Wire tension is a less significant factor. Nonlinear relationships were observed for duty cycle and wire tension. Multi-response optimisation using the utility concept provides collective optimisation of both responses to improve the process mean.
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