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Novel methods for high-speed observation of material removal and molten pool movement in EDM
Precision Engineering ( IF 3.6 ) Pub Date : 2020-07-29 , DOI: 10.1016/j.precisioneng.2020.07.009
Xiaoming Yue , Xiaodong Yang , Qi Li , Xiaohui Li

This paper proposes two new methods to observe discharge phenomena without interference from the plasma in electrical discharge machining. The first method uses a bandpass filter with a bandwidth of 800–820 nm and laser illumination with a wavelength of 800–820 nm. The second method also uses a bandpass filter with a bandwidth of 800–820 nm; however, in this method, the tungsten material is used not only as the tool electrode but also as the illumination source. First, the discharge process was observed using traditional methods to investigate the influence of the plasma on the observation of the discharge process. Then, the process of removing molten material from both the tool electrode and workpiece, as well as molten pool movement, was observed using the first method proposed in this paper. The material removed from the tool electrode was scattered upward along the end profile of the tool electrode, while the material removed from the workpiece was distributed along the horizontal direction. To explain these phenomena, the flow distribution in the gap was qualitatively analyzed using a fluid simulation. Finally, the discharge process was also observed using the second method proposed in this paper. A tungsten tool electrode can emit light with a wavelength of 800–820 nm, which shines on the observed region during the discharge process. The observation results verified the phenomenon of multiple explosions of the molten pool during the discharge process. Moreover, it was found that the material removed by the explosion of the molten pool was scattered in different directions and hardly influenced by the flow distribution in the gap.



中文翻译:

高速观察电火花加工中材料去除和熔池运动的新方法

本文提出了两种在放电加工中观察放电现象而不受等离子体干扰的新方法。第一种方法使用带宽为800-820 nm的带通滤光片和波长为800-820 nm的激光照射。第二种方法还使用带宽为800-820 nm的带通滤波器。然而,在该方法中,钨材料不仅用作工具电极,而且用作照明源。首先,使用传统方法观察放电过程,以研究等离子体对放电过程观察的影响。然后,使用本文提出的第一种方法观察了从工具电极和工件上去除熔融材料的过程以及熔池移动的过程。从工具电极去除的材料沿工具电极的端部轮廓向上散布,而从工件去除的材料沿水平方向分布。为了解释这些现象,使用流体模拟定性分析了间隙中的流动分布。最后,采用本文提出的第二种方法观察了放电过程。钨工具电极可以发出波长为800-820 nm的光,该光在放电过程中会照在观察到的区域上。观察结果证实了在排放过程中熔池多次爆炸的现象。此外,发现通过熔池爆炸而除去的材料在不同方向上分散并且几乎不受间隙中的流动分布的影响。

更新日期:2020-07-29
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