Optimization the machining parameters by using VIKOR and Entropy Weight method during EDM process of Al–18% SiCp Metal matrix composite

Rajesh Kumar Bhuyan,Bharat Chandra Routara

doi:10.5267/j.dsl.2015.11.001

Abstract

Article history: Received June 25, 2015 Received in revised format: October 12, 2015 Accepted November 15, 2015 Available online November 16 2015 The objective of this paper is to optimize the process parameters by combined approach of VIKOR and Entropy weight measurement method during Electrical discharge machining (EDM) process of Al-18wt.%SiCp metal matrix composite (MMC). The central composite design (CCD) method is considered to evaluate the effect of three process parameters; namely pulse on time (Ton), peak current (Ip) and flushing pressure (Fp) on the responses like material removal rate (MRR), tool wear rate (TWR), Radial over cut (ROC) and surface roughness (Ra). The Entropy weight measurement method evaluates the individual weights of each response and, using VIKOR method, the multi-objective responses are optimized to get a single numerical index known as VIKOR Index. Then the Analysis of Variance (ANOVA) technique is used to determine the significance of the process parameters on the VIKOR Index. Finally, the result of the VIKOR Indexed is validated by conformation test using the liner mathematical model equation develop by responses surface methodology to identify the effectiveness of the proposed method. Growing Science Ltd. All rights reserved. 6 © 201

Highlights

Metal matrix composite (MMC) materials are used for different applications in the manufacturing sector
Machining of Aluminium-Silicon carbide (SiC) based metal matrix composite (MMC) by conventional method is an interesting problem because at the time of machining the SiC ceramic particles embedded inside the MMC which are very difficult to machining due to its high strength, inherent brittleness, and low fracture toughness
The tool wear rate (TWR), Radial over cut (ROC) and Ra are considered as nonbeneficial while material removal rate (MRR) is considered as beneficial attribute

Summary

Introduction

Metal matrix composite (MMC) materials are used for different applications in the manufacturing sector. Machining of Aluminium-SiC based MMC by conventional method is an interesting problem because at the time of machining the SiC ceramic particles embedded inside the MMC which are very difficult to machining due to its high strength, inherent brittleness, and low fracture toughness. To overcome this type problem significant amount of Non-traditional machining process are available but in this study electrical discharge machining process is used for these experiments (Ji et al, 2012; Puhan et al 2013). Due to this spark discharge the material is removed by melting and vaporization from both the electrodes and erodes the surface in the shape of tool on the work piece (Laxman & Raj., 2014; Rao et al, 2011)

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