Electric discharge drilling with gas-assisted multi-hole slotted tool

Document Type : Article

Authors

1 Department of Mechanical Engineering, Hindustan College of Science and Technology, Mathura, India

2 Department of Mechanical Engineering, Graphic Era Deemed to be University, Dehradun, Uttarakhand, India

3 Department of Mechanical Engineering, GL Bajaj Institute of Technology and Management, Gr. Noida, India

Abstract

This paper proposes the use of a novel electrode containing modified design explicitly intended to promote gas-assisted tool rotation-induced debris removal. The proposed tool was observed to be efficient in dispensing the accumulation of eroded materials from the discharge gaps. In this work, the influence of process parameters like discharge current, tool speed, gas pressure, pulse duration, and duty cycle has been investigated on output responses: material removal rate (MRR), electrode wear ratio (EWR), and surface roughness (SR). A comparative study of the output responses was made with a solid rotary tool and the gas-aided multi-hole slotted tool. The outcome reveals that the application of the multi-hole slotted tool increased the MRR in AAEDD by 40-80%. Besides this, the EWR decreased in AAEDD by 17–25% compared to REDD. Moreover, the SR of the AAEDD process was comparatively higher (9-15%) than that of the REDD process. It has been found less surface crack, micro pores and recast layers on specimens machined by the AAEDD process in comparison to the REDD process. The present work proposed a novel method for improving the machining performance by improving the flushing efficiency of the machining gap on the way to improve the material removal mechanism.

Keywords


  1. References

    1. Ho, K.H. and Newman, S.T. “State of the art electrical discharge machining (EDM)”, Int. J. of Mach. Tools and Manuf., 43, pp.1287–300 (2003).
    2. Singh, N.K., Pandey, P.M., Singh, K.K., et al. “Steps towards green manufacturing through EDM process: A review”, Cogent Engineering, 3 pp.1272662 (2016).
    3. Singh, N.K., Pandey, P.M., and Singh, K.K. “Experimental investigation into the performance of EDM using argon gas-assisted perforated electrodes”, Mater. Manuf. Proc., 32(9), pp. 940-951 (2017).
    4. Wang, C.C. and Yan, B.H. “Feasibility study of rotary electrical discharge machining with ball burnishing for Al2O3/6061Al composite”, Int. J. of Mach. Tools and Manuf., 40, pp.1403–1421(2000).
    5. Singh, A., Kumar, P., and Singh, I. “Electrical discharge drilling of metal matrix composites with different tool geometries”, J. of Proc. Mech. Engg. doi: 10.1177/0954405413484726 (2013).
    6. Aliakabari, E. and Baseri, H. “Optimization of machining parameters in rotary EDM process by using the Taguchi method”,Int. J. Adv. Manuf. Technol., 62(9-12),pp.1041-1053 (2012).
    7. Teimouri, R. and Baseri, H. “Effects of magnetic field and rotary tool on EDM performance”, J. of Manuf. Proc., doi:10.1016/j.jmapro.2012.04.002 (2012).
    8. Gholipoor, A., Baseri, H., and Shakeri, M. “Investigation of the effects of magnetic field on near-dry electrical discharge machining performance”, Proc IMechE Part B: J. Eng. Manuf., 230(4), pp.744-751(2015).
    9. Gu, L., and Zhao, W. “Electrical discharge machining of Ti6Al4V with a bundled electrode”, Int. J. of Mach. Tools and Manuf., 53, pp.100–106 (2012).
    10. Zhao, W., Li, L., and Gu, L. “Influence of flushing on performance of EDM with bunched electrode”, Int. J. of Mach. Tools and Manuf., 58, pp.187–194 (2012).
    11. Xu, H., Gu, L., and Zhao, W. “Influence of flushing holes on the machining performance of blasting erosion arc machining”, Proc IMechE Part B: J. Eng. Manuf. doi: 10.1177/0954405415616585 (2012).
    12. Singh, N.K., Pandey, P.M., and Singh, K.K. “EDM with air assisted multi-hole tool”, Mater. Manuf. Proc.,doi: 10.1080/10426914.2015.1127954 (2015).
    13. Kuineda, M. and Furuoya, S. “Improvement of EDM Efficiency by Supplying Oxygen Gas into Gap”, CIRP Annals: Manuf. Technol. 40,pp.215-218(1991).
    14. Beravala, H. and Pandey, P.M. “Experimental investigations to evaluate the effect of magnetic field on the performance of air and argon gas assisted EDM processes”, J Manuf Process., 34, pp. 356-373 (2018).
    15. Wang, X., Shen, Y. “High-speed EDM milling with in-gas and outside-liquid electrode flushing technique”, Int J Adv Manuf Technol., 104, pp. 3191-3198 (2019).
    16. Sher, F., Sajid, Z., Tokay, B., et al. “Study of gas–liquid mixing in stirred vessel using electrical resistance tomography”, Asia-pacific J. Che. Engg., https://doi.org/10.1002/apj.2019
    17. Guodong, Li. And Wataru, N. “Realization of micro EDM drilling with high machining speed and accuracy by using mist deionized water jet”, Prec. Engg., 61, pp.136-146 (2020).
    18. Nastasi, R. and Koshy, P. “Analysis and performance of slotted tools in electrical discharge drilling”, CIRP Annals–Manuf. Technol., 63, pp. 205–18. doi:10.1016/j.cirp.2014.03.054 (2014).
    19. Yan, B.H., Huang, F.Y., Chow, H.M. et al. “Micro-hole machining of carbide by electric discharge machining”, J. Mate. Proc. Tech., 87, pp. 139–145(1999).
    20. Kumar, R. and Singh, I. “Productivity improvement of micro EDM process by improvised tool”, Precision Engineering., 51, pp. 529–535 (2018).
    21. Kumar, S. and Dhanbalan, S. “Influence on machinability and form tolerance of Inconel 718 in EDM using different diameter multi-hole Cu electrodes”, SN Appl. Sci., 1, pp. 396 (2019).
    22. Shara, N.K.A., Sher, F., George, A.Y., et al. “Electrochemical investigation of novel reference electrode Ni/Ni(OH)₂ in comparison with silver and platinum inert quasi-reference electrodes for electrolysis in eutectic molten hydroxide”, Int. J. hydrogen energy, 44(50), 27224-27236 (2019).
    23. Shara, N.K.A., Sher, F., Iqbal, S.Z., et al. “Electro chemical study of different membrane materials for the fabrication of stable, reproducible and reusable reference electrode”, J. energy chem., 49, 33-41 (2020).
    24. Patel, K.M., Pandey, P.M., and Rao, P.V. “Study on machinability of Al2O3 ceramic composite in EDM using response surface methodology”, J. of Engg. Mater. Technol., 133(2), pp. 021004-1-021004-10 (2011).
    25. Srivastava, V. and Pandey, P.M. “Performance evaluation of EDM process using cryogenically cooled electrode”, Mater. Manuf. Proc., 27(6), 683–8 (2012).
    26. Mohan, B., Rajadurai, A., and Satyanarayana, K.G. “Effect of SiC and rotation of electrode on electric discharge machining of Al-Si composite”, J. Mate. Proc. Tech.  124, pp. 297-304(2002).
    27. Singh, N.K., Pandey, P.M., and Singh, K.K. “A semi-empirical model to predict material removal rate during air-assisted electrical discharge machining”, J Braz. Soc. Mech. Sci. Eng., 41, pp. 122. https://doi.org/10.1007/s40430-019-1623-0 (2019).
    28. Teimouri, R. and Baseri, H. “Study of Tool Wear and Overcut in EDM Process with Rotary Tool and Magnetic field”, Advances in Tribology, doi: 10.1155/2012/895918 (2012).
    29. Koshy, P., Jain, V.K. and Lal, K. “Experimental investigation into electrical discharge machining with rotating disk electrode”, J. of Precis. Engg. 15, pp. 6-15 (1993).
    30. Chattopadhyaya, K.D., Verma, S., and Satsangi, P.C. “Development of empirical model for different process parameters during rotary electrical discharge machining of copper–steel (EN-8) system”, J. Mate. Proc. Tech., pp. 1454–1465 (2009).
    31. Das, S., Klotz, M., and Klocke, F. “EDM simulation: finite element-based calculation of deformation, microstructure and residual stresses”, J. Mater. Proce. Technol., 142,pp. 434- 451 (2003).
    32. Tao, J., Shih, A.J., and Ni, J. “Experimental study of the dry and near dry electrical discharge milling process”, J. of Manuf. Sci. and Engg. 130 (1), pp. 1-8 (2008).
    33. Beravala, H. and Pandey, P.M. “Modelling of material removal rate in the magnetic field and air-assisted electrical discharge machining”, Proc IMechE Part C: J Mech. Engg. Sci., 0(0) 1–12. DOI: 10.1177/0954406219892297 (2019).
    34. Kuppan, P., Rajadurai, A. and Narayanan, S. “Influence of EDM process parameters in deep hole drilling of Inconel 718”, Int. J. Adv. Manuf. Technol.,  38, pp.74–84 (2008).
    35. Srivastava, V. and Pandey, P.M. “Experimental investigation on electrical discharge machining process with ultrasonic-assisted cryogenically cooled electrode”, Proc IMechE Part B: J. Eng. Manuf., 227(2), (2012).
    36. Kuineda, M. and Yoshida M. “Electrical discharge machining in gas”, CIRP Annals: Manuf. Technol., 46 (1), pp. 143–6 (1997).