Physical and electrical characteristics of EDM debris
Physical and electrical characteristics of EDM debris
复制标题
DOI：
10.1016/j.jmatprotec.2015.09.019
复制
发表时间：
2016-03-01
影响因子：
6.3
通讯作者：
Clare, A. T.
中科院分区：
文献类型：
--
作者：
Murray, J. W.;Sun, J.;Clare, A. T.
在 EDM 中，碎片在每次火花之前的放电间隙的电气条件中起着关键作用。尽管如此，尚未对所有长度尺度的碎片进行分析，因此尚未完全了解放电过程产生的碎片的性质。在这项研究中，对设置为负极性的两种电极材料（硅和碳化钛）进行加工产生的碎片进行离心分离，并使用 SEM 和 TEM 进行成像。分析表明，电极碎片的尺寸为 1 nm 或更小，最大为 10 μm。颗粒尺寸分布的总体分析用于构建基于格子玻尔兹曼方法框架的电场模型，模拟此类碎片的存在对电场强度的影响。该方法被证明能够捕获电场的局部变化并定性预测电场强度相对于碎片浓度增加的正确趋势。此类数据对于预测和控制放电间隙尺寸以及了解碎片堆积对不受控制的火花的影响非常重要。 (C) 2015 年作者。由 Elsevier B.V. 出版
In EDM, debris plays a key role in the electrical conditions of the discharge gap prior to each spark. Despite this, analysis of debris at all length-scales has not yet been performed, and therefore the nature of debris produced by electrical discharge processes is not fully understood. In this study debris created by the machining of two electrode materials set as negative polarity, silicon and titanium carbide, was centrifuged and imaged using SEM and TEM. From this analysis it was shown that electrode debris is 1 nm or lower and up to 10 mu m in size. Population analysis of the particle size distribution was used to inform an electric field model based on a lattice Boltzmann method framework, simulating the effect of the presence of such debris on the electric field strength. This method is shown to be able to capture the local variation of the electric field and predict qualitatively the correct trend of the electric field strength increasing against the debris concentration. Such data is important for prediction and control of discharge gap size, as well as understanding the impact of a build-up of debris on uncontrolled sparking. (C) 2015 The Authors. Published by Elsevier B.V.