Phan Nguyen - No. ۲۹۸, Cau Dien Street, Bac Tu Liem District, Hanoi.
Ngoc -Vu Ngo - Thai nguyen University of Technology (TNUT), Thai nguyen, Vietnam
Nguyen Tam - Hanoi University of Industry, No. ۲۹۸, Cau Dien Street, Bac Tu Liem District, Hanoi, Vietnam

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-۶Al-۴V) 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 = ۳۰A, Ton = ۵۰۰ µs, U = ۵۰ V and optimized quality criterias are MRR = ۰.۱۷ mm۳/min and SR = ۸.۷۶ µm.

Taguchi, TOPSIS, MRR, SR, EDM