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Experimental studies on Wire EDM for surface roughness and kerf width for shape memory alloy

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Abstract

The present experimental work was carried out on wire electrical discharge machine (WEDM) over NiTi shape memory alloy for biomedical applications. Improving of machineability of intricate profiles in biomaterial applications is a challenging task. The experiments were performed on WEDM by using a brass wire of 0.25 mm diameter, as tool electrode. A range of 4 to 8 ampere of current, range of 60-120 µs of pulse on time, range of 15-45 µs of pulse off time, range of 11-15 cm2/gm of wire tension and range of 4-8 m/min wire feed were selected as input parameters. The influence of these parameters was observed on surface roughness and kerf width during fabrication of rectangular slots. The discharge craters, voids, microcracks and white layer have been observed in machined surface by scanning electron microscopy (SEM). It was observed that at higher values of discharge energy, the recast layer thickness increases. The higher recast layer found is 15.88 at Ip = 8, Ton = 120, Toff = 30, WT = 11, Wf = 4. The performance of responses was analysed by the response surface methodology and artificial neural network modelling. The obtained values of 0.993 and 0.995 from ANN model shows strong correlation between selected parameters. The obtained desirability is 0.957 that presents the developed model and is quite significant for both responses.

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Acknowledgement

The authors would like to thank Prof. S.A.C. Ghani, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang, Malaysia for guidance. The authors gratefully acknowledge the financial support given by the Malaysian Ministry of Higher Education, Universiti Malaysia Pahang (www.ump.edu.my) and UMP Automotive Engineering Centre (AEC) for Fundamental Research Grants Scheme (FRGS), RDU160135.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Manipal University Jaipur, Dehmi Kalan, Jaipur, Rajasthan, 303 007, India

    ASHISH GOYAL

  2. Centre for Nanoscience and Nanotechnology, Jamia Milia Islamia, Jamia Nagar, New Delhi, 110 025, India

    HUZEF UR RAHMAN

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Correspondence to ASHISH GOYAL.

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GOYAL, A., UR RAHMAN, H. Experimental studies on Wire EDM for surface roughness and kerf width for shape memory alloy. Sādhanā 46, 160 (2021). https://doi.org/10.1007/s12046-021-01684-3

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