Study on parameter’s optimization for the minimizing of the residual stress in powder mixed near-dry electric discharge machining

Document Type : Article


1 Department of Mechanical Engineering, Delhi Technological University, Delhi, 110089, India

2 Department of Production and Industrial Engineering, Punjab Engineering College, Chandigarh, 160012, India



There are some undesired effects left in the machined products by electric discharge machining (EDM) and the most prominent among those is the residual stress. These induced residual stresses influence fatigue behavior, dimensional stability, and stress corrosion which is responsible for the failure of the machined product. It was observed that the products obtained by powder mixed near dry- EDM or (PMND-EDM) have a considerably low value of residual stress (RS). The objective of this research is to minimize the residual stresses induced in the machined workpiece (EN-31) by optimizing the process parameters which affects the machining characteristics significantly. Selected parameters were tool diameter, mist flow rate, metallic powder concentration, and mist pressure while the workpiece selected was EN-31 due to its desirable mechanical properties and immense applications in the manufacturing industry. The minimum value of residual stress at optimized values of process parameters was found to be 106.32 MPa.


 [1]     Kao C.C., Tao J., and Shih A .J. “Near dry electrical discharge machining”,  Int. J. Mach. Tool. Manuf.  47, pp. 2273–2281 (2007).
[2]     Gao Q., Zhang Q.H., and Zhang J.H. “Experimental study of powder-mixed near dry electrical discharge machining”, Chin. J. Mech. Engg. 45, pp. 169–175 (2009).
[3]     Shen Y., Liu H.Y., and  Zhang Y. “High-speed dry electrical discharge machining”,  Int. J. Mach. Tool. Manuf.  93, pp. 19–25 (2015).
[4]     Sundriyal S., Walia R.S., and Vipin.  “Powder Mixed Near Dry Electric Discharge Machining Parameter Optimization for Tool Wear Rate”, Advances in Unconventional Machining and Composites. Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Singapore (2020).
[5]     Yadav, V.K., Kumar P., and  Dvivedi A.  “Performance enhancement of rotary tool near-dry EDM of HSS by supplying oxygen gas in the dielectric medium”, Material. Manuf. Process. (2019)
[6]     Yadav V.K., Kumar P., and Dvivedi A. “Effect of tool rotation in near-dry EDM process on machining characteristics of HSS”, Material. Manuf. Process. (2019).
[7]     Sundriyal S., Walia R.S., and Vipin.  “Near Dry and Powder Mixed Near Dry Electric Discharge Machining”, Int. J. Engg. Adv. Tech. 9, pp. 2021-2025 (2019)
[8]     Sundriyal S., Walia R.S., Vipin., and  Tyagi M. “Investigation on surface finish in powder mixed near dry electric discharge machining method”, Materials Today: Proceedings. 25, pp. 808-809 (2019).
[9]     Gill A.S., and Kumar S.  “Investigation of Micro-Hardness in Electrical Discharge Alloying of En31 Tool Steel with Cu–W Powder Metallurgy Electrode“, Arab. J. Sci. Engg.  43, pp. 1499-1510 (2018).
[10]  Chundru V.R., Koona R., and  Pujari S.R.  “Surface Modification of Ti6Al4V Alloy Using EDMed Electrode Made with Nano- and Micron-Sized TiC/Cu Powder Particles”,  Arab. J. Sci. Engg.  44, pp. 1425–1436 (2019).
[11]  Rahul., Datta S., and Biswal B.B.  “A Novel Satisfaction Function and Distance-Based Approach for Machining Performance Optimization During Electro-Discharge Machining on Super Alloy Inconel 718”,  Arab. J. Sci. Engg.   42, pp. 1999–2020 (2017).
[12]  Lloyd H.K., and Warren R.H.  “Metallurgy of Spark-Machined Surfaces”,  J. Iron.  Steel Inst. 203, pp. 238–247 (1965).
[13]  Rebelo J.C., Dias A.M., and Kremer D.  “Influence of Pulse Energy on the Surface Integrity of Martensitic Steels”, J. Mat. Process. Technol.  84, pp. 90–96 (1998).
[14]  Crookall J.R., and Khor B.C. “Residual Stresses and Surface Effects in Electro Discharge Machining”, Proceedings 13th MTDR Conf, Birmingham, PP. 16-27 (1972).
[15]  Sundriyal S., Vipin., and  Walia R.S. “Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining”, Strojniški vestnik – J. Mech. Engg. 66, pp. 243-253 (2020).
[16]  Sundriyal S., Vipin., and  Walia R.S.  “Experimental Investigation of the Micro-hardness of EN-31 Die Steel in a Powder-Mixed Near-Dry Electric Discharge Machining Method”, Strojniški vestnik - J. Mech. Engg. 66: 184-192 (2020).
[17]  Ekmekci B., Elkoca O., and Tekkaya A.E.  “Residual Stress State and Hardness Depth in Electric Discharge Machining: De-Ionized Water as Dielectric Liquid”, Mach. Sci.  Technology.  9, pp. 39-61 (2007).
[18]  Ekmekci B., Tekkaya A.E., and Erden A.D.  “A semi-empirical approach for residual stresses in electric discharge machining (EDM) ”,  Int. J. Mach. Tool. Manuf. 46, pp.  858–868 (2006).
[19]  Kumar S., Grover S., and Walia R.S. “Effect of hybrid wire EDM conditions on generation of residual stresses in machining of HCHCr D2 tool steel under ultrasonic vibration”, Int. J. Interact. Des. Manuf12, pp. 1119-1137 (2018)
[20]  Liu J.F., and Guo Y.B. “Residual Stress Modeling in Electric Discharge Machining (EDM) by Incorporating Massive Random Discharges”, Procedia CIRP. 45, pp. 299 – 302 (2016).
[21]  Shabgard M., Seydi S., and Seyedzavvar M.  “Novel approach towards finite element analysis of residual stresses in electrical discharge machining process”, Int. J. Adv. Manuf. Technol.   82, pp.1805–1814 (2016).
[22]  Rao P.S., Ramji K., and  Satyanarayana B.  “Effect of wire EDM conditions on generation of residual stresses in machining of aluminum 2014 T6 alloy”,  Alex. Engg. J. 55, pp. 1077–1084 (2016).
[23]  Aruja E.   Displacement of X-Ray Reflexions. Nature  15453 (1944)
[24]  Shen Y., Liu Y., and   Sun W. “High-speed near dry electrical discharge machining. J. Mat. Process. Technol”,  233, pp.  9-18 (2016).
[25]  Kruth J.P., and Bleys P.   “Measuring residual stresses caused by wire EDM of tool steel”, Int. J. Elect. Mach.  5, pp. 23–28 (2000).
[26]  Talla G., Gangopadhyay S., Biswas C.K.  “Influence of Graphite Powder Mixed EDM on the Surface Integrity Characteristics of Inconel 625”, J. Part. Sci. Technol.  35, pp.  219-226 (2016).