Improvement of blade platform accuracy in ECM utilizing an auxiliary electrode
Improvement of blade platform accuracy in ECM utilizing an auxiliary electrode
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DOI：
10.1080/10426914.2020.1752920
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发表时间：
2020-05
影响因子：
4.8
通讯作者：
An Zhang;Zhengyang Xu;Jiangwei Lu;Yudi Wang
中科院分区：
文献类型：
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作者：
An Zhang;Zhengyang Xu;Jiangwei Lu;Yudi Wang
摘要电解加工是一种能加工复杂结构的高效加工技术。然而，对于带有平台的叶片，常用的电火花加工方法只考虑型面的加工精度。由于杂散腐蚀，平台表面会出现锥度，降低加工精度。提出了一种利用带辅助电极的阴极工具(AE)提高电解加工叶片平台精度的新方法。具体地说，将AE安装在阴极刀具上，以改变电场并抑制杂散电流，有助于提高加工精度。在本研究中，对电场的模拟表明，声发射减小了杂散电流的范围和大小，减小了平台的预测锥度。对SS304、Inconel718和Ti-48Al-2Cr-2Nb(TiAl 4822)三种不同材料的叶片进行了加工试验。结果表明，利用声发射可以更好地控制叶片平台的杂散腐蚀。SS304、Inconel718和TiAl4822叶片平台的最佳锥度分别为−0.097°、−0.086°和−0.080°，与使用带绝缘层的阴极加工相比，分别减少了50.7%、61.3%和77.6%。
ABSTRACT Electrochemical machining (ECM) is an efficient technique that can produce complex structures. However, for a blade with platform, the common ECM method only considers the machining accuracy of the profile. Owing to the stray corrosion, a taper can appear on the surface of the platform and reduce processing precision. This study presents a novel method for improving blade platform accuracy in ECM utilizing a cathode tool with an auxiliary electrode (AE). Specifically, an AE is installed on a cathode tool to change the electric field and restrain stray current, contributing to greater machining accuracy. In this study, the simulations for electric field demonstrate that both the range and size of stray current are reduced and the predicted taper of the platform is reduced by the AE. Blade machining experiments were conducted for three different materials, namely, SS304, Inconel 718, and Ti-48Al-2Cr-2Nb (TiAl 4822). It was confirmed that stray corrosion of the blade platform can be better controlled by utilizing an AE. The optimal tapers of the SS304, Inconel 718, and TiAl 4822 blade platforms were −0.097°, −0.086°, and −0.080°, respectively, which represented reductions of 50.7%, 61.3%, and 77.6%, compared to the processing done by utilizing a cathode with an insulating layer.