Investigations on the performance of concentric flow dry wire electric discharge machining (WEDM) for thin sheets of titanium alloy

  • Bharat C. Khatri
  • Pravin P. Rathod


Dry wire electric discharge machining (WEDM) process has been proposed to cut intricate and complex profiles on difficult to cut thin materials with a view to improve material integrity and minimize environmental impact and operators health issues. However, longer cutting cycles and poor geometrical accuracy are the inherent drawbacks of the dry WEDM process.

In this paper, the authors have proposed a novel method using concentric flow of gaseous dielectric fluid for the dry WEDM process. The proposed method is intended to provide efficient flushing of debris from the sparking gap and minimizes the debris resolidification on the material surface. Which in turns, minimize the cutting cycles and improve geometrical accuracy of the work material. Titanium alloy, Ti-6Al-4 V (ASTM Grade 5) thin sheet was used for the experiments using side flow and concentric flow modes with a compressed air jet as dielectric media. Current, air pressure, pulse-on time and pulse-off time have been selected as process parameter, and the effects on cutting velocity (CV), kerf width (Kw) and material removal rate (MRR) were investigated. Results indicate that the proposed concentric flow system resulted in a higher CV and MRR and generated a lower Kw than side flow system of dielectric supply. Results of analysis of variance (ANOVA) indicated that current is the most significant parameter contributing to CV and MRR. However, air pressure and pulse-on time significant parameters for Kw for both the dielectric supply modes. Moreover, the response prediction models developed using regression analysis indicated good conformance with the actual results. Improved performance in the case of CDWEDM indicates that the concentric flow system of dielectric supply can be technically viable and economically feasible alternate to conventional side flow system in order to exploit the dry WEDM process effectively and efficiently.


Concentric flow Side flow Wire EDM Dry WEDM Titanium alloy 


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  1. 1.
    Ho KH, Newman ST (2003) State of the art electrical discharge machining (EDM). International Journal of Machine Tools & Manufacture 43:1287–1300CrossRefGoogle Scholar
  2. 2.
    Schumacher BM (2004) After 60 years of EDM the discharge process remains still disputed. J Mater Process Technol 149:376–381CrossRefGoogle Scholar
  3. 3.
    Lin YC, Lee HS (2009) Optimization of machining parameters using magnetic-force-assisted EDM based on gray relational analysis. International Journal of Advance Manufacturing Technology 42:1052–1064CrossRefGoogle Scholar
  4. 4.
    Khatri BC, Rathod PP, Valaki JB (2014) Ultrasonic vibration-assisted electric discharge machining (EDM): a research review. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture doi: 10.1177/0954405415573061
  5. 5.
    Tonshoff HK, Egger R, Klocke F (1996) Environmental and safety aspects of electro physical and electrochemical processes. CIRP Annals –Manufacturing Technology 45(2):553–568CrossRefGoogle Scholar
  6. 6.
    Valaki JB, Rathod PP, Khatri BC (2014) Environmental impact, personnel health and operational safety aspects of electric discharge machining: a review. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture , doi: 10.1177/0954405414543314
  7. 7.
    Ramani V and Cassidenti ML (1985) Inert-gas electrical discharge machining. NASA Technical Brief Number NPO15660Google Scholar
  8. 8.
    Kunieda M, Yoshida M (1997) Electrical discharge machining in gas. Annals of the CIRP 46(1):143–146CrossRefGoogle Scholar
  9. 9.
    Teimouri R, Baseri H (2013) Experimental study of rotary magnetic field-assisted dry EDM with ultrasonic vibration of workpiece. Int J Adv Manuf Technol 67:1371–1384CrossRefGoogle Scholar
  10. 10.
    Evertz S, Eisentraeger A, Dotti W, Klocke F, Karden A, Antonoglou G (2001) Environmental and industrial hygiene in connection with electrical discharge machining at high discharge energies. In: Proceedings of the 13th International Symposium on Electro machining (ISEM XIII), I, 193–210Google Scholar
  11. 11.
    Leao FN, Pashby IR (2004) A review on the use of environmentally-friendly dielectric fluids in electrical discharge machining. J Mater Process Technol 149:341–346CrossRefGoogle Scholar
  12. 12.
    Obara H, Ishizu N, Kawai T, Ohsumi T, Hayashi T (2000) Simulation of wire EDM (3rd report). JSEME 34(75):30–37 (in Japanese)Google Scholar
  13. 13.
    Kunieda M, Furudate C (2001) High precision finish cutting by dry WEDM. CIRP Anals- Manufacturing Technology 50(1):121–124CrossRefGoogle Scholar
  14. 14.
    Furudate C, Kunieda M, Bo YZ, Yamada H (2001) Improving Process Characteristics of DRY-WEDM. 10th International Conference on Precision Engineering (IPCE) 209–213Google Scholar
  15. 15.
    Azhiri RB, Teimouri R, Baboly MG (2014) Application of Taguchi, ANFIS and grey relational analysis for studying, modeling and optimization of wire EDM process while using gaseous media. Int J Adv Manuf Technol 71:279–295CrossRefGoogle Scholar
  16. 16.
    Shayan AV, Afza RA, Teimouri R (2013) Parametric study along with selection of optimal solutions in dry wire cut machining of cemented tungsten carbide (WC-Co). J Manuf Process 15(4):644–658CrossRefGoogle Scholar
  17. 17.
    Boopathi S, Sivakumar K (2013) Experimental investigation and parameter optimization of near-dry wire-cut electrical discharge machining using multi-objective evolutionary algorithm. Int J Adv Manuf Technol 67:2639–2655CrossRefGoogle Scholar
  18. 18.
    Abdulkareem S, Khan AA, Zain ZM (2011) Experimental investigation of machining parameters on surface roughness in dry and wet wire-electrical discharge machining. Adv Mater Res 265:831–836CrossRefGoogle Scholar
  19. 19.
    Kao CC, Tao J, Lee S, Shih AJ, Arbor A (2006) Dry wire electrical discharge machining of thin workpiece. Transactions of namri / sme 34:253–260Google Scholar
  20. 20.
    Okada A, Uno Y, Onoda S, Habib S (2009) Computational fluid dynamics analysis of working fluid flow and debris movement in wire EDMed kerf. CIRP Anals- Manufacturing Technology 58:209–212CrossRefGoogle Scholar
  21. 21.
    Wang S, Zeng Y, Liu Y, Zhu D(2010) Micro wire electrochemical machining with an axial electrolyte flow. Int J Adv Manuf Technol; doi: 10.1007/s00170-011-3858-5
  22. 22.
    Hoang KT, Yang SH (2015) Kerf analysis and control in dry micro-wire electrical discharge machining. Int J Adv Manuf Technol; doi: 10.1007/s00170-014-6764-9
  23. 23.
    Hoang KT, Yang SH (2014) Experimental study and process optimization for vibration-assisted dry micro-WEDM. J Korean Soc Precis Eng 31(3):215–222CrossRefGoogle Scholar

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© Springer-Verlag London 2017

Authors and Affiliations

  1. 1.School of EngineeringRK UniversityRajkotIndia
  2. 2.Mechanical Engineering DepartmentL.D. College of EngineeringAhmedabadIndia
  3. 3.Mechanical Engineering Department, Government Engineering CollegeBhujIndia

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