International Journal of Engineering Research ISSN:2319-6890 (online),2347-5013(print) Volume No.6, Issue No.5, pp :242-246 1 May 2017 DOI : 10.5958/2319-6890.2017.00011.3 Page 242 A Review on Optimization of Micro EDM Machining Performances Binayaka Nahak Department of Mechanical Engineering, I.I.T., B.H.U. Varanasi, India binayakanahak@gmail.com Abstract- Now these days there is a massive requirement in the production of microstructures by a unconventional method. Micro-EDM (μEDM) is a widely accepted unconventional machining option in which material erosion takes place from work-piece using a sequence of electrical spark. This method is used to manufacture micro-parts with the range of 50 μm -100 μm. This paper studied the optimization of various process parameters namely gap voltage, peak current and pulse duration to attain suitable μEDM performance measures such as Material Removal Rate (MRR), low Electrode Wear (EW) and good surface morphology of the microstructure accepted from μEDM machining process. Keywords: Micro-EDM, Material Removal Rate, Too Wear , Surface Morphology I. Introduction Diver C et al. [1] described that μEDM is a imitative of the EDM process for machining small microstructure. It is a well established process used to produce micro holes in metal utilized for numerous application namely spinner holes, turbine blades cooling channels, and drug delivery orifices. This method is quite similar to EDM process in which material erosion of conductive material takes place using generated spark between two conductive electrodes regardless of its hardness, strength etc. This paper brief study of the several papers represent the effect of process parameters on the machining performance related to μEDM with four headings namely MRR, EW, surface quality as well as microstructure of μEDMed component . II. Material Removal Rate Mechanism The MRR is the proportion of the volume (mm 3 ) of material remove of work-piece to the machining time (min). Minh Dang Nguyen et al. [2] revealed the application of deionized water for μEDM because it offers higher MRR as well as low tool wear than other fluid. On the other hand, higher value of frequency with small pulse interval decrease material erosion. In addition, the μEDMed surface with deionized water shows minor result from material movement because of a smaller amount debris observed in the μEDM machining. Fuzhu Han et al.[3] revealed the comparative use between transistor-type and traditional-type isopulse generator in μEDM. The transistor-type isopulse generator shows more removal rate and machining speed than traditional-type isopulse generator. G. Kibria et al.[4] observed the result of various dielectric namely boron carbide suspended kerosene, deionized water on machining performances during μEDM machining of titanium alloy. The deionized water shows more MRR and TWR than kerosene. Whereas boron carbide- mixed dielectrics shows higher value of MRR, but TWR reduces with kerosene dielectric. The deionized water shows lower white layer thickness on EDMed surface compared to kerosene. The higher value of MRR with the rise of pulse interval with B 4 C mixed kerosene as compared to pure kerosene and deionised water because of more spark discharge time. Mohammad Ahsan Habib et al. [5] represented the manufacturing of complicated electrodes for μEDM. For this purpose, In this study, the localized electrochemical deposition (LECD) is used due to its cheap with safety manufacturing process. This electrode is preferred as negative electrode polarity results more MRR than positive tool. On the other hand, tool RWR reduces with this negative tool. In addition, it is save time saving and cost method. Kun Liu et al. [6] demonstrated novel method used in μEDM based on pulse generator. This method is used to machine ceramic composite Si 3 N 4 -TiN and stainless steel. But the MRR of Si 3 N 4 -TiN composite is high compared to stainless steel whereas drastically low tool wear is observed. M. S. Azad et al. [7] optimized process performances of μEDM drilling of titanium alloy based on Taguchi method. The MRR improves with discharge energies. The end wear of electrode is source of errors for assessment of the electrode length. The side wears influence the form of the hole created .The voltage is the most important parameter in μEDM .Muhammad Pervej Jahan et al.[8] studied the improving surface characteristics with graphite nano particles blended in dielectric of μEDM and μEDM milling of cemented tungsten carbide. The presence of this enhance the surface finish, material erosion because of machining of more surface region and reduce the EWR. The powder-mixed μEDM milling offers even and perfect surface because of good flushing condition compared to sinking μEDM. G. Bissacco et al.[9] analysed both work piece and tool wear in μEDM milling of steel. Both the MRR and electrode wear volume increase with discharge energy. The volumetric wear ratio linearly rise with energy index. The proportion of cathode as well as anode wear reduce with decreasing discharge duration. E. Aligiri et al.[10] used a novel tool wear compensation process to estimate material removal volume in real time. The single electrical discharge electro-thermal model is combined with online