| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 101 === In this experiment, the process is added with a new effect of the electrolytic solution by letting the electrolytic solution to coat on a quartz glass in the shape of a droplet while dripping down, in order to avoid the bubbles released during the electrolysis accumulating at the inlet and outlet of the processing area and affecting the gas film stability and developing slit expansion phenomenon, therefore, to increase the process efficiency. Although the process has pretty good features, however, the surface of the slit is less refined after the process. Therefore, graphite powder and silicon carbide abrasive granules are added separately in the electrolytic solution. Using transport lines to bring the granules into the thin fine slit to perform the polishing process, hopefully to improve the surface fineness after the polishing process and to investigate whether, after adding the granules, other types of process and process features can be added.
The wire electrode used in this study is a brass wire with φ0.15mm in diameter; the selected work piece is the quartz glass of 1.1mm thickness. In the experiment, the process voltage, the feed rate and the electrolytic solution flow volume are selected for a series of discussions in relevant to the process feature of electrochemical discharge wire cutting process. Finally, based on the experimental results, the scale of the process voltage directly impact the processing depth and slit fineness. When the feed rate (f) = 300 μm/min; the electrical energy discharged and materials removed under such feed rate are arranged appropriately; and the wire electrode does not crush the insulating gas film, a better process quality is obtained. When the electrolytic solution flow volume is equal to 4 c.c/min, the electrolytic solution response rate is able to fully supplement the process area in order to maintain the gas film stability and to achieve a better process efficiency. The graphite powder can diversify the electrical energy discharged and stabilize the electrical current during the electrical energy discharge. In addition, the accession of the polishing mechanism by adding silicon carbide abrasive granules can reduce the surface roughness of the slit and the expansion of the slit.
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