| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 100 === Since quartz is a hard and brittle material, it is difficult to achieve high efficiency and high reliability using conventional methods, especially in the manufacturing of micro parts and components. Electrochemical discharge machining (ECDM) is an emerging non-traditional machining process that involves high-temperature melting assisted by accelerated chemical etching. During ECDM, gas film will be formed on the tool electrode surface due to electrochemical reaction and then result in discharge phenomenon. Therefore both the structure and stability of gas film have significant effect factors on the efficiency and precision of machining. During ECDM, the impact of high heat discharged and the differences in electrolyte cycle cause gas film to be irregular in structure and unstable in status. As a result, both the quality and efficiency of ECDM are undermined. Therefore, this study will first explore the effect of different electrode types for processing performance, and in order to improve the stability of gas film structure, this study attempt to use the tunable magnetic field (electromagnet) effect keeps bubbles move quickly form the tool electrode. both the stability of gas film structure and the efficiency of electrolyte cycle in micro holes are greatly enhanced.
According to the experimental results, by changing the electrode shape, that machining time was reduced by 73.8%, can be substantially improved processing efficiency. Then increase the tunable magnetic field, that machining time was reduced by 49.5%, and the standard deviation of the processing time achieve 91.8%. Finally, tunable magnetic field generated by asymmetric gas film type, further enhance the capacity of the electrolyte cycle. Thus machining time was reduced by 24.4% again.
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