High-speed dry electrical discharge machining |
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| Affiliation: | 1. Research Scholar, School of Engineering, RK University, Rajkot 360020, India;2. Mechanical Engineering Department, Government Engineering College, Bhavnagar 364001, India;3. Mechanical Engineering Department, Government Engineering College, Bhuj 370001, India;4. Mechanical Engineering Department, School of Engineering, RK University, Rajkot 360020, India;1. Department of Mechanical Engineering, Curtin University, Bentley, WA 6102, Australia;2. Adelaide Microscopy, the University of Adelaide, Adelaide, SA 5005, Australia;3. School of Engineering, Deakin University, Waurn Ponds 3220, Australia;1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2. Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipment and Control, Tsinghua University, Beijing 100084, China |
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| Abstract: | A novel high-speed dry electrical discharge machining (EDM) method was proposed in this study. Using this method, the material can be rapidly melted by extremely high discharge energy and flushed out of the discharge gap by high-pressure and high-speed air flow. The material removal rate (MRR) of dry EDM was significantly improved by the proposed method. The MRR of dry EDM is usually in tens mm3/min, whereas the MRR of the proposed method can be as high as 5162 mm3/min, which improves the MRR by 2nd to 3rd order of magnitude. Investigation was conducted systemically. The influences of work piece polarity, discharge current, pulse duration time, gas pressure, and electrode rotation speed on machining performance were studied. The machining mechanism of this method was thoroughly analyzed. Moreover, the re-solidified layer, surface morphology, elementary composition, and phase of AISI 304 stainless steel for high-speed dry EDM were also investigated. Theoretical and technical foundations were laid for the industry application of dry EDM. |
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| Keywords: | Dry EDM High-speed machining Material removal rate Air |
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