Electrochemical drilling with vacuum extraction of electrolyte

Electrochemical drilling with vacuum extraction of electrolyte
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真空抽取电解液的电化学钻孔

DOI:
10.1016/j.jmatprotec.2009.09.006
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发表时间:
2010-01
影响因子:
6.3
通讯作者:
Fang, X. L.
Fang, X. L.
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang, W.;Zhu, D.;Qu, N. S.;Huang, S. F.;Fang, X. L.

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电解液的正向流动模式在电化学钻井过程中得到了广泛的应用。但加工间隙内的电解液出现急剧发散流动,导致电解液异常溶解,甚至产生有害的火花。电解液逆流可以使加工过程稳定,但由于应用可行性差,很少使用。本文提出了一种真空抽提电解液的电化学钻孔方法。电解液的真空抽提极大地促进了逆流在电化学钻井中的应用。对不同电解液流动方式下加工间隙内的流动分布进行了数值和实验比较。采用真空抽提的反向流动可以提高工艺稳定性,同时减少火花和条纹的形成。对真空抽提的加工特性进行了实验研究。为减小电解液真空抽吸电解加工加工孔径向过切,采用正交设计优化初始加工间隙、外加电压、刀具进给速率和电解液浓度等工艺参数。在优化后的实验中,取得了良好的效果。
Forward flow pattern of electrolyte is widely used in electrochemical drilling (ECD) process. But electrolyte in the machining gap presents a sharp divergent flow which causes an abnormal dissolution and even harmful sparking. Reverse flow of electrolyte leads to a stable machining process but is rarely used due to the poor application feasibility. In this paper, an electrochemical drilling method with vacuum extraction of electrolyte has been proposed. Vacuum extraction of electrolyte greatly facilitates the application of reverse flow in electrochemical drilling. Flow distributions along the machining gap with different electrolyte flow pattern are compared numerically and experimentally. Reverse flow using vacuum extraction is shown to improve the process stability while diminishing sparking and formation of striations. Machining characteristics of vacuum extraction are investigated experimentally. To minimize the radial overcut of machined hole by electrochemical machining with vacuum extraction of electrolyte, the orthogonal design is used to optimize process parameters such as initial machining gap, applied voltage, tool feed rate, and electrolyte concentration. Good results have been obtained in the experiments with optimized parameters.
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