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Study on the nano-powder-mixed sinking and milling micro-EDM of WC-Co

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Abstract

Present study investigates the feasibility of improving surface characteristics in the micro-electric discharge machining (EDM) of cemented tungsten carbide (WC–Co), a widely used die and mould material, using graphite nano-powder-mixed dielectric. In this context, a comparative analysis has been carried out on the performance of powder-mixed sinking and milling micro-EDM with view of obtaining smooth and defect-free surfaces. The surface characteristics of the machined carbide were studied in terms of surface topography, crater characteristics, average surface roughness (R a) and peak-to-valley roughness (R max). The effect of graphite powder concentration on the spark gap, material removal rate (MRR) and electrode wear ratio (EWR) were also discussed for both die-sinking and milling micro-EDM of WC–Co. It has been observed that the presence of semi-conductive graphite nano-powders in the dielectric can significantly improve the surface finish, enhance the MRR and reduce the EWR. Both the surface topography and crater distribution were improved due to the increased spark gap and uniform discharging in powder-mixed micro-EDM. The added nano-powder can lower the breakdown strength and facilitate the ignition process thus improving the MRR. However, for a fixed powder material and particle size, all the performance parameters were found to vary significantly with powder concentration. Among the two processes, powder-mixed milling micro-EDM was found to provide smoother and defect-free surface compared to sinking micro-EDM. The lowest value of R a (38 nm) and R max (0.17 μm) was achieved in powder-mixed milling micro-EDM at optimum concentration of 0.2 g/L and electrical setting of 60 V and stray capacitance.

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References

  1. Casas B, Torres Y, Llanes L (2006) Fracture and fatigue behavior of electrical discharge machined cemented carbides. Int J Refract Met Hard Mater 24:162–167

    Article  Google Scholar 

  2. Koshy P, Jain VK, Lal GK (1997) Grinding of cemented carbide with electrical spark assistance. J Mater Process Technol 72:61–68

    Article  Google Scholar 

  3. Ramasawmy H, Blunt L (2002) 3D surface topography assessment of the effect of different electrolytes during electrochemical polishing of EDM surfaces. Int J Mach Tools Manuf 42:567–574

    Article  Google Scholar 

  4. Wong YS, Lim LC, Rahuman I, Tee WM (1998) Near-mirror-finish phenomenon in EDM using powder-mixed dielectric. J Mater Process Technol 79:30–40

    Article  Google Scholar 

  5. Erden A, Bilgin S (1980) Role of impurities in electric discharge machining. In Proceedings of 21st International Machine Tool Design and Research Conference, Macmillan, London, pp. 345–350

  6. Jeswani ML (1981) Effects of the addition of graphite powder to kerosene used as the dielectric fluid in electrical discharge machining. Wear 70:133–139

    Article  Google Scholar 

  7. Narumiya H, Mohri N, Saito N, Otake H, Tsnekawa Y, Takawashi T, Kobayashi K (1989) EDM by powder suspended working fluid. In Proceedings of 9th ISEM, pp. 5–8

  8. Mohri N, Saito N, Higashi MA (1991) A new process of finish machining on free surface by EDM methods. Ann CIRP 40(1):207–210

    Article  Google Scholar 

  9. Kobayashi K, Magara T, Ozaki Y, Yatomi T (1992) The present and future developments of electrical discharge machining. In Proceedings of 2nd International Conference on Die and Mould Technology, Singapore, pp. 35–47

  10. Yan BH, Chen SL (1994) Characteristics of SKD11 by complex process of electric discharge machining using liquid suspended with aluminum powder. J Jpn Inst Light Met 58(9):1067–1072

    Google Scholar 

  11. Uno Y, Okada A (1997) Surface generation mechanism in electrical discharge machining with silicon powder mixed fluid. Int J Elec Mach 2:13–18

    Google Scholar 

  12. Wang CH, Lin YC, Yan BH, Huang FY (2001) Effect of characteristics of added powder on electric discharge machining. J Jpn Inst Light Met 42(12):2597–2604

    Google Scholar 

  13. Tzeng YF, Lee CY (2001) Effects of powder characteristics on electro discharge machining efficiency. Int J Adv Manuf Technol 17:586–592

    Article  Google Scholar 

  14. Pecas P, Henriques EA (2003) Influence of silicon powder mixed dielectric on conventional electrical discharge machining. Int J Mach Tools Manuf 43:1465–1471

    Article  Google Scholar 

  15. Kung KY, Horng JT, Chiang KT (2009) Material removal rate and electrode wear ratio study on the powder mixed electrical discharge machining of cobalt-bonded tungsten carbide. Int J Adv Manuf Technol 40:95–104

    Article  Google Scholar 

  16. Chow HM, Yan BH, Huang FY, Hung JC (2000) Study of added powder in kerosene for the micro-slit machining of titanium alloy using electro-discharge machining. J Mater Process Technol 101:95–103

    Article  Google Scholar 

  17. Tan PC, Yeo SH, Tan YV (2008) Effects of nano-sized powder additives in micro-electrical discharge machining. Int J Precis Eng Manuf 9(3):22–26

    Google Scholar 

  18. Jahan MP, Anwar MM, Wong YS, Rahman M (2009) Nanofinishing of hard materials using micro-EDM. Proc IMechE, Part B: J Engineering Manufacture 223(9):1127–1142

    Article  Google Scholar 

  19. Jahan MP, Wong YS, Rahman M (2009) A study on the fine-finish die-sinking micro-EDM of tungsten carbide using different electrode materials. J Mater Process Technol 209:3956–3967

    Article  Google Scholar 

  20. Jahan MP, Wong YS, Rahman M (2009) Effect of non-electrical and gap control parameters in the micro-EDM of WC-Co. J Mach Form Technol 1/2:51–78

    Google Scholar 

  21. Jahan MP, Wong YS, Rahman M (2009) A study on the quality micro-hole machining of tungsten carbide by micro-EDM process using transistor and RC-type pulse Generator. J Mater Process Technol 209(4):1706–1716

    Article  Google Scholar 

  22. Lee SH, Li XP (2001) Study of the effect of machining parameters on the machining characteristics in EDM of tungsten carbide. J Mater Process Technol 115:344–355

    Article  Google Scholar 

  23. Tzeng YF, Chen FC (2005) Investigation into some surface characteristics of electrical discharge machined SKD-11 using powder-suspension dielectric oil. J Mater Process Technol 170:385–391

    Article  Google Scholar 

  24. Jahan MP, Wong YS, Rahman M (2010) A comparative experimental investigation of deep-hole micro-EDM drilling capability for cemented carbide (WC-Co) against austenitic stainless steel (SUS 304). Int J Adv Manuf Technol 46(9–12):1145–1160

    Article  Google Scholar 

  25. Yan BH, Huang FY, Chow HM, Tsai JY (1999) Micro-hole machining of carbide by electrical discharge machining. J Mater Process Technol 87:139–145

    Article  Google Scholar 

  26. Wu KL, Yan BH, Huang FY, Chen SC (2005) Improvement of surface finish on SKD steel using electro-discharge machining with aluminum and surfactant added dielectric. Int J Mach Tools Manuf 45:1195–1201

    Article  Google Scholar 

  27. Bleys P, Kruth JP, Lauwers B, Schacht B, Balasubramanian V, Froyen L, Humbeeck JV (2006) Surface and sub-surface quality of steel after EDM. Adv Eng Mater 8:15–25

    Article  Google Scholar 

  28. Kansal HK, Singh S, Kumar P (2007) Technology and research developments in powder mixed electric discharge machining (PMEDM). J Mater Process Technol 184:32–41

    Article  Google Scholar 

  29. Amorim FL, Weingaertner WL (2005) The influence of generator actuation mode and process parameters on the performance of finish EDM of tool steel. J Mater Process Technol 166:411–416

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore, 119260

    Muhammad Pervej Jahan, Mustafizur Rahman & Yoke San Wong

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  1. Muhammad Pervej Jahan
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  2. Mustafizur Rahman
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  3. Yoke San Wong
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Correspondence to Mustafizur Rahman.

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Jahan, M.P., Rahman, M. & Wong, Y.S. Study on the nano-powder-mixed sinking and milling micro-EDM of WC-Co. Int J Adv Manuf Technol 53, 167–180 (2011). https://doi.org/10.1007/s00170-010-2826-9

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  • DOI: https://doi.org/10.1007/s00170-010-2826-9

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