Optimizationof wire cut EDM parameters of higher MRR for titanium alloy 6242

Dec 2017 / by R. PRASANNA, P. SHANMUGHASUNDARAM and M. UTHAYKUMAR

Titanium alloys are difficult to machine in traditional machining method. Wire cut electrical discharge machining enables machining of all engineering materials. This article deals with machining of titanium alloy employing wire cut EDM. Taguchi and analysis of variance methods (ANOVA) were used to find optimum level of process parameter such as pulse on, pulse off, voltage, wire feed rate on material removal rate of titanium alloy. Material removal rate were studied against different process parameters, such as pulse on, pulse off, voltage, wire feed rate. Taguchi’s L9 orthogonal array has been used to conduct the experiments. Significance of this parameter on responses was determined by analysis of variance (ANOVA). Main effect plot for S/N ratio are determined to find the optimum parameter for higher material removal rate. Delta rank was obtained for material removal rate to find the priority of process parameter. Finally machined surface for optimum parameter is concluded with the analyzation of SEM micrograph.
Keywords: Ti-6242, wire cut EDM, Taguchi, delta rank, ANOVA, material removal rate

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Performance study on VCR engine using blends of waste engine oil fuel and diesel

Dec 2017 / by R. BHARAT BALAJI, R. SIVAPRAKASAM and R. GOPINATHAN

Fossil fuel exhaustion and strict emission norms are attracting the researchers to pursue an alternative means of fuel for IC engines. In parallel, the used engine oils are disposed in a rather careless way causing serious pollution to air and water bodies. Due to fossil fuel scarcity and ever increasing costs, used engine oils can be processed and used as an alternate fuel. By filtering with chemicals and blending, a fuel with similar properties to diesel can be obtained from used engine oil. Also the performance characteristics of the produced fuel are tested and found out to be comparable with that of diesel fuel. In this study, samples of used engine oil collected from automobiles are cracked by pyrolysis and different percentage of blends with fresh diesel are done, which are then analyzed on a VCR engine. The cracking process is presented in this article along with its characteristics tested out. The analyzed results are then tabulated and compared to diesel fuel.
Keywords: Fuel scarcity, waste engine oil, VCR engine, blending, pyrolytic cracking

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