||Generally, the machining targets of wire electrical discharge machines are metals. As for machining quartz glass, due to its higher scale of hardness and its brittleness, it is difficult to apply machining on this material. Electrochemical discharge machining is one of the machining processing ways which uses high temperature melting made from arc discharge and assists with etching. This thesis adopts wire electrochemical discharge machining (WECDM) with titrated electrolyte flow to process quartz glass. When operating with this method, it’s necessary to keep the stability of arc discharge phenomenon or the distance between the copper wire and the quartz glass cannot be kept. This will lead the unsuccessful cutting and the required accuracy cannot be reached.|
This study used camera image to observe wire′s position during processing. If the quartz glass was not successfully removed when machining, the wire polar would be oppressed when the wire touched to the material, and the wire would be bent. At this moment, the copper wire was withdrawn to proper distance, and the machining continued again. The experiment showed that the processing succeeded under the feed rate of 1000μm/min, and the error range could be reduced below 10μm when carving quartz glass was under 700μm. However, when machining depth over 1000μm, the frequency and intensity of current is too strong and unstable enough and led to worse controlling effect so that the error range could not be limited within 10μm. The result shows that this experiment reduced 43% machining time in comparison with the best operative rate 350μm/min among all the current documents. The accuracy was improved and the efficiency was better than before.
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