Effect of multipass cutting on surface roughness in wire electrical discharge machining of metal matrix composites
Journal Title: Carbon - Science and Technology - Year 2014, Vol 6, Issue 3
Abstract
The workpiece produced by wire electrical discharge machining (WEDM) has the surface variations caused by simultaneous heating and cooling process during machining. The thermally affected layers have great effect on mechanical and metallurgical properties. It is not possible to achieve good surface finish (Ra) with a single pass. After the machining process few finishing passes have to be used to produce a better surface finish. In this paper an attempt is made to achieve maximum surface finish by using multi cutting passes in WEDM. The Metal Matrix Composite (MMC) workpieces were machined at one, two and three cutting passes and the Ra of the workpieces of MMC is measured. Field Emission Scanning Electron Microscopy (FESEM) picture is analyzed to study the white layer or recast layer and heat affected zone (HAZ) in the machined surface of the workpiece. By the experimental results, it is found that Ra value is reduced by increasing the number of cutting passes. In rough cutting pass the white layer is formed which increases the surface cracks and craters. In semi finish cutting passes the thickness of the white layer is reduced and it decreases the surface cracks and craters and in finish cutting pass the white layer is completely removed.
Authors and Affiliations
S. Ramesh, N. Natarajan, V. Krishnaraj
Keywords
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