Study on Multi-Objects Optomization in EDM with Nickel Coated Electrode using Taguchi - AHP – Topsis

Document Type : Original Article

Authors

1 No. 298, Cau Dien Street, Bac Tu Liem District, Hanoi.

2 Thai nguyen University of Technology (TNUT), Thai nguyen, Vietnam

3 Hanoi University of Industry, No. 298, Cau Dien Street, Bac Tu Liem District, Hanoi, Vietnam

Abstract

To improve productivity and quality of machining process using Electrical Dischagre Machining (EDM), a lot of electrodes such as coated and alloy electrodes has been applied. Study on multi-objects optimization in EDM with coated electrode will increase number of application of this field into practice. In this study, material removal rate (MRR) and surface roughness (SR) in Electrical Dischagre Machining using Niken coated aluminium electrode were optimized simultaneously using Taguchi - AHP – Topsis methods. Technological parameters including Peak Current (I), Gap Voltage (U) and pulse on time (Ton) were investigated. Titanium alloy (Ti-6Al-4V) was selected as workpiece in experimental process. The results show that combination among Taguchi - AHP - Topsis methods is suitable to solve multi-objects optimization in EDM. The optimized technological parameters are I = 30A, Ton = 500 µs, U = 50 V and optimized quality criterias are MRR = 0.17 mm3/min and SR = 8.76 µm.

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