Open AccessOptimization of Wire EDM Process Parameters for Medical Grade Nickel Titanium Shape Memory Alloy
Author(s) -
Vinayak N. Kulkarni,
V. N. Gaitonde,
K S Nalavade,
Mrityunjay Doddamani,
Gajanan M. Naik
Publication year - 2020
Publication title -
strojnícky časopis/journal of mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.276
H-Index - 8
eISSN - 2450-5471
pISSN - 0039-2472
DOI - 10.2478/scjme-2020-0007
Subject(s) - nickel titanium , machining , materials science , electrical discharge machining , taguchi methods , surface roughness , orthogonal array , metallurgy , scanning electron microscope , titanium alloy , shape memory alloy , process (computing) , surface finish , alloy , mechanical engineering , composite material , computer science , engineering , operating system
Nickel Titanium (NiTi) alloys are the class of smart materials classified under shape memory alloys. The traditional machining of these alloys is hard because of various inherent mechanical characteristics of these alloys. Therefore, non-traditional machining process such as wire electro discharge machining (WEDM) has been employed for machining of such alloys. The present study is focused on multi-performance characteristic simultaneous optimization of WEDM process parameters, in which three system control factors, namely, pulse on time (T ON ), pulse off time (T OFF ) and wire feed (WF) are considered for simultaneously maximizing material removal rate (MRR), while minimizing surface roughness (SR) and tool wear rate (TWR). The simultaneous optimization is performed using Taguchi’s Quality Loss Function. Analysis of means and analysis of variance have been carried out to identify the significance level of each system control factor. The different levels of settings and the optimized setting have been analysed using scanning electron microscope images for surface morphological studies. The multi-response optimization investigations revealed that T ON is the major contributing factor and optimal performance values were obtained at T ON of 125μs, T OFF of 25μs and at WF of 4 m/min.