Optimization of Wire Electrical Discharge Machining Process Parameters in AZ91 Magnesium Alloy Using Taguchi-Based Fuzzy Analytic Hierarchy Process (TFAHP) Method
doi: 10.14456/mijet.2024.2
Keywords:
Optimisation, EDM process, Taguchi method, fuzzy AHPAbstract
In the electrical discharge machining process optimization domain, a dominant approach to optimization is the Taguchi method, which is favoured for its simplicity and low-cost implementation requirements. However, the results obtained from the Taguchi method have been criticized as susceptible to errors and wrong decisions since it is based on crisp numerical values. Unfortunately, the impact of such wrong decisions cannot be tolerated as it has a chain effect on the non-financial aspects of the organization’s practice such as loss of goodwill. To reverse this issue, research is urgently desired. This article aims to optimize and fuzzifier the electrical discharge machining process parameters using the Taguchi method and the fuzzy analytic hierarchy process method. This article introduces a capturing mechanism of uncertainty and imprecision aspects into the Taguchi method and the Taguchi method has been modified as a new method termed the Taguchi method fuzzy analytic hierarchy process method (T-FAHP). The T-FAHP converts the crisp numerical values into fuzzy numbers which were optimized. The optimal parametric settings and rankings of factors were determined. The optimal parametric settings, delta values, ranks and comparison results were pursued. It was found that the optimal parametric setting did not change from those of the T-AHP results. It yielded A1B1C1D1E1F1 interpreted as pulse on time (160units), pulse off time (40units), pulse current (70 units), gap voltage (20 units), wire feed (4 units) and wire tension (4 units). The ranks were led by pulse current and last by wire feed. The ranking occurred in a different order but the first and the last positions were assigned to pulse current and wire feed, respectively. For the delta values, considering Taguchi AHP against when using the Taguchi-fuzzy analytical hierarchy process, we had a reduction of 16.49% for the pulse current, an increase of 28.57%, for the pulse off time, a decrease of 55.56%, for the gap voltage, no changes, for wire feed, no changes, for wire tension, an increase of roughly 10%. The results obtained from this study are suitable for use by process engineers in the machining industry for cost-effective machining decisions.
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