Observation of Material Removal Process by Single Discharge in Air Gap
Observation of Material Removal Process by Single Discharge in Air Gap
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DOI：
10.1016/j.procir.2017.12.062
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Tani Takayuki;Yoshiki Tsujita;Hiromitsu Gotoh;Masaaki Okada;N. Mohri
中科院分区：
文献类型：
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作者：
Tani Takayuki;Yoshiki Tsujita;Hiromitsu Gotoh;Masaaki Okada;N. Mohri
电火花加工（EDM）可用于高精度加工。但材料去除率较低。材料去除率低的原因之一是，即使材料通过放电熔化，也只有一小部分熔化的材料被去除。从这个角度来看，理解在电火花加工中去除材料的过程是极其重要的。在本研究中，使用配备高倍率镜头的高速摄像机观察单次放电加工工件的状态。选择了一种机器条件，在这种条件下，可以在气隙中发现针电极的长脉冲持续时间，以便于观察材料的行为。采用带通滤光片（只允许特定波长通过）的观测系统使用激光束作为照明。在不受等离子体发射影响的情况下，可以观察到工件在放电过程中的行为。在一次放电期间，间歇性地发生了几次爆炸。因此，几个小陨石坑叠加在表面被观察到。
Electrical discharge machining (EDM) can be used to perform high-precision machining. However, the material removal rate is low. One of the reasons for the low material removal rate is that only a small part of the melted material is removed even when the material is melted by electrical discharge. From this viewpoint, understanding the process by which the material is removed in EDM is extremely important. In this study, the state of a workpiece being processed by a single discharge was observed using a high-speed camera equipped with a high-magnification lens. A machine condition was selected, in which a long pulse duration by the needle electrode can be found in air gap, to enable an easy observation of the material behavior. An observation system that employs a bandpass filter, which allowed only a specific wavelength to pass through, was constructed using a laser beam as illumination. The workpiece behavior during discharge could be observed without the influence of plasma emission. Several explosions intermittently occurred during a single discharge duration. Consequently, several small craters superposed on the surface were observed.