| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系 === 107 === In this thesis, an electrochemical discharge machining transmission microscope, which composed of an transmission microscope, electrochemical discharge machining system, and image analysis system, was proposed for observing the formations of bubbles and the gas film during the machining. The mechanisms and relationships of the bubbles and the gas film evolution between their status and current signals need to be further investigated. An experimental setup with a conical/columnar electrode was constructed for the observations when there were with/without samples. Furthermore, a photograph of 10,000 shots per second by a high speed camera was taken to observe the status of the bubble and the the gas film evolution. As the result of the experimental, it showed that the bubbles and the gas film evolution was highly correlated with current signals. In the case of a columnar electrode, the largest volume was 3-17 seconds slower than the volume at the moment of the largest current. In the case of a conical electrode, the largest volume was 3-13 seconds slower than the volume at the moment of the largest current. Besides, the gas film of conical electrode was stable more fast than the columnar electrode, and the condition without quartz glass became stable more fast than the condition with quartz glass. From the images we got, it could be observed that of gas film broken and discharged was also observed, then the gas bubble was simultaneously produced to repair the defective gas film.
In this thesis, the microscopic observation system we mentioned was described first, and then we discussed the the bubbles and the gas film evolution with the microscopic observation system we mentioned. Finally, the results of the observation were discussed, and then the conclusions and future prospects were presented.
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