In this paper, an effective approach, Taguchi grey relational analysis, has been applied to experimental results of wire cut electrical discharge machining (WEDM) on Inconel 825 with consideration of multiple response measures. The approach combines the orthogonal array design of experiment with grey relational analysis. The main objective of this study is to obtain improved material removal rate, surface roughness, and spark gap. Grey relational theory is adopted to determine the best process parameters that optimize the response measures. The experiment has been done by using Taguchi's orthogonal array L36 (21 × 37). Each experiment was conducted under different conditions of input parameters. The response table and the grey relational grade for each level of the machining parameters have been established. From 36 experiments, the best combination of parameters was found. The experimental results confirm that the proposed method in this study effectively improves the machining performance of WEDM process. © 2013 Springer-Verlag London.

Rajyalakshmi G

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Venkata Ramaiah P.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

The International Journal of Advanced Manufacturing Technology

Wire electrical discharge machining (WEDM), is the most commonly used thermoelectric method to machine electrically conductive materials because of its ability to machine any complex and intricate shapes with increased precision and dimensional accuracy. In this study, the fatigue samples are prepared through WEDM process according to Taguchi's L9 orthogonal array (OA) of experiments by varying the pulse time (TON/TOFF) and wire speed, each at three levels. The parametric effect on fatigue life, surface roughness (SR), material removal rate (MRR), recast layer depth and microstructure is studied. The recast layer and microstructure of the machined samples were analysed using scanning electron microscopy (SEM). From the results, the fatigue life of the component decreases (53.86%) as the TON time increases (108 μs to 112 μs). This reduces the surface quality by 21.37% and increases the depth of recast layer. Simultaneously, an improvement of 14.31% in MRR was obtained by increasing the TON from 108 μs to 112 μs and wire speed from 1 m/min to 3 m/min. The optimal level of the factors for better responses was found by Taguchi response graph and variance analysis. Grey relational analysis (GRA) was done for overall process optimisation. © 2018 Inderscience Enterprises Ltd.

International Journal of Machining and Machinability of Materials

Response optimisation in wire electrical discharge machining of AISI H11 tool steel using Taguchi - GRA approach

In the research work, an attempt is made to join nickel-based alloy 825 by employing CO2 laser beam welding. Successful full penetration weld joint of a 5 mm thick plate is achieved with a very low heat input of 120 J-mm−1. Narrow weld bead width of 0.6 mm at the root and 1.6 mm at the cap is observed fusion zone; the interface and base metal microstructures have been examined using both optical and scanning electron microscopic techniques to understand the microstructural changes which have occurred due to laser welding. A range of tests of Vickers micro hardness, tensile and impact tests had been performed on the weldment to ascertain the mechanical properties of the joint. Tensile failure at the base metal and a 180° root bend test conducted on the weldment ascertain the soundness of the weld joint produced. An attempt is made to correlate the microstructure and mechanical properties of the weldment. Intermetallics TiN and Al4C3 observed in the SEM\EDS analysis at the fusion zone are found to have improved the weld metal strength and hardness. © 2017 Canadian Institute of Mining, Metallurgy and Petroleum.

Canadian Metallurgical Quarterly

Investigations on metallurgical and mechanical properties of CO2 laser beam welded Alloy 825

In this paper, a new effective approach, Taguchi grey relational analysis has been applied to experimental results in order to optimize the high-speed turning of Inconel 718 with consideration to multiple performance measures. The approach combines the orthogonal array design of experiments with grey relational analysis. Grey relational theory is adopted to determine the best process parameters that give lower magnitude of cutting forces as well as surface roughness. The response table and the grey relational grade graph for each level of the machining parameters have been established. The parameters: cutting speed, 475 m/min; feed rate, 0.10 mm/rev; depth of cut, 0.50 mm; and CW2 edge geometry have highest grey relational grade and therefore are the optimum parameter values producing better turning performance in terms of cutting forces and surface roughness. Depth of cut shows statistical significance on overall turning performance at 95% confidence interval. © 2011 Springer-Verlag London Limited.

International Journal of Advanced Manufacturing Technology

Multi-objective optimization of surface roughness and cutting forces in high-speed turning of Inconel 718 using Taguchi grey relational analysis (TGRA)

Archives of Civil and Mechanical Engineering

AFM surface investigation of Inconel 825 with multi wall carbon nano tube in electrical discharge machining process using Taguchi analysis

Electrode wear and material removal rate during EDM of aluminum and mild steel using copper and brass electrodes

European Journal of Operational Research

Prediction of index futures returns and the analysis of financial spillovers—A comparison between GARCH and the grey theorem

Multi response optimization of machining parameters of drilling Al/SiC metal matrix composite using grey relational analysis in the Taguchi method

Multiple process parameter optimization of wire electrical discharge machining on Inconel 825 using Taguchi grey relational analysis

Journal	Data powered by TypesetThe International Journal of Advanced Manufacturing Technology
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	0268-3768
Open Access	No