What is it about?

In this study, the machinability characteristics of Al/B4C-Gr hybrid composite were investigated using wire electrical discharge machining (WEDM). In the experiments, the machining parameters of wire speed, pulse-on time and pulse-off time were varied in order to explain their effects on machining performance, including the width of slit (kerf) and surface roughness values (Rz and Rt). According to the Taguchi quality design concept, a L18 (21×32) orthogonal array was used to determine the S/N ratio, and analysis of variance (ANOVA) and the F-test were used to indicate the significant machining parameters affecting the machining performance. From the ANOVA and F-test results, the significant factors were determined for each of the machining performance criteria of kerf, Rz and Rt. The variations of kerf, Rz and Rt with the machining parameters were statistically modeled via the regression analysis method.

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Why is it important?

In this the effects of control factors in the use of WEDM for the machining of B4C-Gr hybrid composites in particular were determined, thus compensating for the lack of coverage in the literature.


The most effective parameter on kerf, and on Rz and Rt surface roughness was pulse-on time, with contribution ratios of 75.63%, 43.29% and 36.76%, respectively. Other effective parameters for kerf were pulse-off time and wire speed, with respective contribution ratios of 9.15% and 9%. The correlation coefficient (R2) of the predictive equations developed for the estimation of minimum kerf, and Rz and Rt surface roughness by linear regression analysis was calculated as 0.98, 0.828 and 0.855, respectively. The high correlation coefficients reflect the reliability of the developed equations. The error ratios of the estimated results obtained by the Taguchi method and predictive equations were less than 10% and indicated the reliability of the statistical analyses.

Prof.Dr. Ali Riza Motorcu
Canakkale Onsekiz Mart Universitesi

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This page is a summary of: Wire Electrical Discharge Machining of a Hybrid Composite: Evaluation of Kerf Width and Surface Roughness, Uludağ University Journal of The Faculty of Engineering, April 2016, Uludag University Journal of the Faculty of Engineering,
DOI: 10.17482/uujfe.21303.
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