Influence of Electrodes and Parameters on Micro-EDM Drilling Performances of 304L Stainless Steel

摘要

The current work concerns with studying the effect of micro electrical discharge machining (Micro-EDM) parameters, including; the types of electrodes, the pulse current and the pulse on time on the process responses performances like; material removal rates (MRR), tool wear ratio (TWR), surface roughness (SR), overcut (OC) and the holes taper for micro-EDM holes-drilling of a biomaterial stainless steel 304L workpieces with 250–300 μm dimensions. The experimental results were designed and modeled by using the response surface methodology (RSM), the analysis of variance (ANOVA) and the statistical Expert system 10.0 software program. The results show that the use of higher pulse current up to (16 A) improved the MRR, OC and the taperness of the produced micro-holes, while the use of lower pulse current (8 A) improved the EWR. The using of pulse on duration values up to (75 μs) improved the taperness of the produced micro-holes, while it has fewer influences on the other output parameters. Results also indicated that the MRR reached a maximum value of (0.81×10