在電解液中添加粉末對電化學放電線切割加工特性的影響; The effect of electrolyte powder-mixed on Wire Electrochemical Discharge Machining

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题名:	在電解液中添加粉末對電化學放電線切割加工特性的影響;The effect of electrolyte powder-mixed on Wire Electrochemical Discharge Machining
作者:	何嘉哲;He,Jia-Jhe
贡献者:	機械工程學系
关键词:	碳化矽;石墨粉;電化學放電;silicon carbide;graphite powder;Electrochemical Discharge Machining
日期:	2013-07-24
上传时间:	2013-08-22 12:15:24 (UTC+8)
出版者:	國立中央大學
摘要:	本實驗在加工時增加了電解液更新的效果，使電解液成液滴狀包覆石英玻璃而向下滴落，可避免電解氣泡堆積於加工出入口處影響氣膜的穩定性及產生擴槽現象；以提高加工效率。雖然其具有不錯的加工特性，但是其加工過後溝槽的表面精度較差。因此在電解液中分別添加了石墨粉和碳化矽磨粒，利用送線將磨粒帶入細微溝槽中進行加工，期望能改善其加工後的表面精度並探討添加磨粒後是否會有附加其他類型的加工方式以及加工特性。本研究所使用的線電極為線徑φ0.15mm的黃銅線，選用的工件為厚度1.1mm的石英玻璃。在實驗中選擇了加工電壓、進給速度與電解液流量來對電化學放電線切割加工的加工特性作一系列的討論。最後可由實驗結果得知，加工電壓的大小會直接影響到加工深度及切槽精度。進給速度為f＝300 μm/min時，在該速率中放電能量與材料移除搭配適當且線電極不會壓破絕緣氣膜，會得到較好的加工品質。在電解液流量為4 c.c/min時，電解液反應速度能充分補充於加工區域，使得絕緣氣膜穩定，加工速率較佳。另外添加石墨粉會使放電能量分散，可穩定放電時的電流以及添加碳化矽磨粒所增加的研磨機制皆可使得溝槽表面粗造度降低、擴槽量變小。 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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