Spectroscopic measurement of arc plasma diameter in EDM
Spectroscopic measurement of arc plasma diameter in EDM
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DOI：
10.1016/j.cirp.2008.03.097
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发表时间：
2008-01-01
影响因子：
4.1
通讯作者：
Kunieda, M.
中科院分区：
文献类型：
--
作者：
Kojima, A.;Natsu, W.;Kunieda, M.
本文介绍了电火花加工中电弧等离子体直径的光谱测量方法。为了确定放电电流流过的电弧等离子体区域的直径，利用光谱学测量了单脉冲放电产生的等离子体中的径向温度分布，确定了电离度高的区域。研究发现，电弧等离子体在介质击穿后的几微秒内完成膨胀，而弹坑直径的增长速度相对于电弧等离子体的膨胀速度缓慢。这一新发现与传统的等离子体膨胀模型不同，该模型是基于对产生的陨石坑的观察和未经证实的假设建立的。此外，还量化了电弧等离子体直径随放电电流或间隙宽度的增加而增加，从而可以使用新建立的热源模型精确模拟放电坑的产生。(c) 2008年CIRP。
This paper describes the spectroscopic measurement of arc plasma diameter in EDM. In order to determine the diameter of the arc plasma area where discharge current flows, radial temperature distribution in plasma generated by a single pulse discharge was measured using spectroscopy, and the area with high degree of ionization was determined. It was found that arc plasma completes expanding within a few microseconds after dielectric breakdown, while the diameter of craters grows slowly in comparison with the expanding speed of the arc plasma. This new finding is different from conventional plasma expansion models established based on the observation of generated craters and unproven assumptions. Furthermore, increase in arc plasma diameter with increasing discharge current or gap width was quantified, enabling accurate simulation of discharge crater generation using the newly established heat source model. (c) 2008 CIRP.