Observation of Bubble Behavior in EDM with Ultrasonic Vibration
Observation of Bubble Behavior in EDM with Ultrasonic Vibration
复制标题
超声波振动电火花加工中气泡行为的观察
DOI：
10.1016/j.procir.2022.09.157
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
HIRAO Atsutoshi
中科院分区：
文献类型：
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作者：
CHENXUE Wang;SASAKI Tomohiro;HIRAO Atsutoshi
在电火花钻孔中，当纵横比超过5（L/D=5）时，加工速度逐渐减慢。作为解决方案，市场上EDM机床的Z轴配备了跳跃功能。此功能可有效去除加工碎屑和气泡。此外，管状电极和具有特殊孔的电极都是市售的。从管电极喷射或抽吸加工液以去除加工间隙之间的加工碎屑和气泡。因此，加工间隙始终是清洁的电介质加工液，结果，加工速度不会降低。但是，存在不能使用这些功能和管道电极的情况，为了解决这些问题，对电极和电介质工作流体施加超声波振动。已有报道，超声振动电火花加工影响加工速度。然而，在此过程中发生的现象类型尚未报告。在电火花深孔加工中，对电极和介质工作液施加超声振动，并利用高速显微镜观察了侧面工作间隙的现象。确认了通过施加超声波振动更有效地去除存在于侧工作间隙之间的气泡。如果不施加超声波振动，则气泡聚结。然而，通过施加超声波振动，确认气泡没有结合。
In electric discharge drilling the machining speed gradually slows down, when the aspect ratio exceeds 5 (L/D=5). As a solution, the Z-axis of the EDM machine on the market is equipped with a jump function. This function effectively removes machining debris and air bubbles. Also, both pipe electrodes and electrodes with special holes are commercially available. The machining fluid is ejected or sucked from the pipe electrode to remove machining debris and air bubbles between the work gap. Therefore, the working gap is always a clean dielectric working fluid, and as a result, the machining speed does not decrease. However, there are cases in which these functions and pipe electrodes cannot be used.To solve these problems, ultrasonic vibration was applied to the electrodes and dielectric working fluid. It has been reported that EDM with ultrasonic vibration affects machining speed. However, the type of phenomenon that occurs during this process has not been reported. In deep hole drilling by EDM, ultrasonic vibration was applied to the electrodes and dielectric working fluid, and the phenomenon at the side working gap was observed using a high-speed microscope. It was confirmed that the air bubbles existing between the side working gap were more effectively removed by applying ultrasonic vibration. If ultrasonic vibration is not applied, air bubbles coalesce. However, it was confirmed that the air bubbles were not united by applying ultrasonic vibration.