EXPERIMENTATION AND ANALYSIS INTO MICRO-HOLE MACHINING IN EDM ON Ti-6AL-4V ALLOY USING BORON CARBIDE POWDER MIXED DE-IONIZED WATER
نویسندگان
چکیده
In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics have different chemical compositions, cooling rates and dielectric strengths. For this, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material removal rate (MRR), tool wear rate (TWR), overcut (OC), taperness and machining time (MT) during micro-machining of through holes on Ti-6Al-4V superalloy employing de-ionized water based dielectric other than conventional hydro-carbon oil i.e. kerosene. The paper also includes the comparative study of the micro-EDM machining characteristics employing boron carbide (B4C) powder as additive in deionized water dielectric at different discharge energies. The results shows that MRR and taperness of micro-hole is improved and TWR is reduced employing B4C powder than pure dielectric. Surface topography and recast layer formed during micro-hole machining by micro-EDM has also been investigated based on optical and SEM micrographs.
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