Effect of the Micro Wire-EDM Process Parameters on the Recast Layer in the Molybdenum Micromachining

Document Type: Original Article

Authors

1 Faculty of New sciences & Technologies, University of Tehran, Tehran, Iran *Corresponding author

2 Micro/Nano-Manufacturing Technologies Development Laboratory, Faculty of New sciences & Technologies, University of Tehran, Iran

3 Faculty of New sciences & Technologies, University of Tehran, Tehran, Iran

Abstract

The Micro wire electrical discharge machining (Micro wire-EDM) process is a modern machining process with various applications in manufacturing micro-parts. The recast layer remaining on the machined surfaces is an inevitable complication of this process. This layer can subsequently affect the machined parts performance. To optimize the recast layer in the micro wire-EDM of the molybdenum microparts, effect of the process parameters on the distribution amplitude of the recast layer was investigated using the Taguchi method. The obtained results showed that the optimal levels of the micro wire-EDM process parameters for achieving the optimal distribution amplitude of the recast layer are as follows: spark pulse-on time of 0.2 μs, cutting speed of 7 mm/min, process voltage of 17 V, and wire tension of 0.45 kg. Also the importance order of the effect of the process parameters on the distribution amplitude of recast layer is as follows: spark pulse-on time, process voltage, cutting speed, and wire tension.

Keywords


[1]     Rupajati, P., Soepangkat, B. O. P., Pramujati, B., and Agustin, H. C. K., “Optimization of Recast Layer Thickness and Surface Roughness in the Wire EDM Process of AISI H13 Tool Steel Using Taguchi and Fuzzy Logic”, Applied Mechanics and Materials, Vol. 493, 2014, pp. 529-534.

[2]     Newtona, T. R., Melkote, S. N., Watkins, T. R., Trejo, R. M., and Reister, L., “Investigation of the effect of process parameters on the formation and characteristics of recast layer in wire-EDM of Inconel 718”, Materials Science and Engineering, Vol. 513, 2009, pp. 208-215.

[3]     Shahali, H., Yazdi, M. R. S., Mohammadi, A., and Iimanian, E., “Optimization of surface roughness and thickness of white layer in wire electrical discharge machining of DIN 1.4542 stainless steel using micro-genetic algorithm and signal to noise ratio techniques”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 226, No. 5, 2012, pp. 803-812.

[4]     Puri, A. B., Bhattacharyya, B., “Modeling and analysis of white layer depth in a wire-cut EDM process through response surface methodology”, The International Journal of Advanced Manufacturing Technology, Vol. 25, No. 3, 2005, pp. 301-307.

[5]      Rajesha, S., Jawalkar, C. S., Mishra, R. R., Sharma, A. K., and  Kumar, P., “Study of Recast Layers and Surface Roughness on Al-7075 Metal Matrix Composite During EDM Machining”, International Journal of Recent advances in Mechanical Engineering, Vol. 3, No. 1, 2014, pp. 53-62.

[6]     Zhang, Y., Liu, Y., Ji, R., and Cai, B., “Study of the recast layer of surface machined by sinking electrical discharge machining using water-in-oil emulsion as dielectric”, Applied Surface Science, Vol. 257, 2011, pp .5989-5997.

[7]     Ekmekci, B., “Residual stresses and white layer in electric discharge machining (EDM)”, Applied Surface Science, Vol. 253, No. 23, 2007, pp. 9234-9240.

[8]     Chiang, K., Chang, F. P., and Tsai, D. C., “Modeling and analysis of the rapidly resolidified layer of SG cast iron in the EDM process through the response surface methodology”, Journal of Materials Processing Technology, Vol. 182, No. 1, 2007, pp. 525-533.

[9]     Azam, M., Jahanzaib, M., Abbasi, J. A., Abbas, M., Wasim, A., and Hussain, S., “Parametric analysis of recast layer formation in wire-cut EDM of HSLA steel”, The International Journal of Advanced Manufacturing Technology, 2016, pp. 1-10.

[10]  Mohamed, A. R., Asfana, B., and Ali, M. Y., “Investigation of Recast Layer of Non-Conductive Ceramic due to Micro-EDM”, In Advanced Materials Research, Vol. 845, 2014, pp. 857-861.