Authors: Anand Sharma; M.P. Garg; Kapil Kumar Goyal; Anish Kumar
Addresses: Department of Mechanical Engineering, JMIT, Radur, Haryana, India ' Department of Mechanical Engineering, D.A.V. University, Jalandhar, Punjab, India ' Department of Mechanical Engineering, M.M. Engineering College, Mullana, Haryana, India ' Department of Mechanical Engineering, M.M. Engineering College, Mullana, Haryana, India
Abstract: In recent years, more and more newer and hard to machine materials have been developed with an ever increasing demand of machining the complex shapes which has lead the conventional machining operations reach their limitations. In the present work, an attempt is made to machine the 6063 aluminium metal matrix composite, which is the combination of Al alloy 6063 reinforced with zirconium silicate 5% (i.e., Al 6063/ZrSiO4p) using wire electrical discharge machining (WEDM). Experiments have been designed through Box-Behnken design (BBD) approach of response surface methodology (RSM). The empirical models for response characteristics viz. cutting rate and surface roughness have been developed considering the WEDM input process parameters. Analysis of variance (ANOVA) and F-test are performed to study the significance of process parameters on the response outputs. To aid in selecting the best combination of settings, the concept of desirability is utilised. Scanning electron microscopy (SEM) of machined surfaces is carried out to understand the effect of various process parameters on work piece material surface characteristics. The confirmation experiments have been conducted for the optimal parameters suggested by developed empirical models and it has been observed that the experimental results are in good agreement with the predicted results.
Keywords: metal matrix composites; aluminium MMCs; wire EDM; electrical discharge machining; WEDM; Box-Behnken design; BBD; response surface methodology; RSM; analysis of variance; ANOVA; scanning electron microscopy; SEM; electro-discharge machining; zirconium silicate; ZrSiO4; cutting rate; surface roughness; surface quality; process parameters.
International Journal of Machining and Machinability of Materials, 2016 Vol.18 No.4, pp.392 - 411
Received: 07 Apr 2015
Accepted: 31 Oct 2015
Published online: 13 Jul 2016 *