Study on Micro EDM Aided by Ultrasonic Vibration in Nitrogen Plasma Jet

ZHANG Congyang; ZOU Rimao; YU Zuyuan

doi:10.16080/j.issn1671–833x.2019.11.032

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Study on Micro EDM Aided by Ultrasonic Vibration in Nitrogen Plasma Jet

更新时间：2025-10-30

- Study on Micro EDM Aided by Ultrasonic Vibration in Nitrogen Plasma Jet
- Aeronautical Manufacturing Technology Vol. 62, Issue 11, Pages: 32-38(2019)
- 作者机构：
  
  大连理工大学机械工程学院,大连,116024
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671–833x.2019.11.032
  CLC：
- Published：2019
- 稿件说明：
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张从阳，邹日貌，余祖元. 超声辅助等离子体中微细电火花加工技术研究[J]. 航空制造技术, 2019, 62(11): 32-38.

ZHANG Congyang, ZOU Rimao, YU Zuyuan. Study on Micro EDM Aided by Ultrasonic Vibration in Nitrogen Plasma Jet. Aeronautical Manufacturing Technology, 2019, 62(11): 32-38.
张从阳，邹日貌，余祖元. 超声辅助等离子体中微细电火花加工技术研究[J]. 航空制造技术, 2019, 62(11): 32-38. DOI： 10.16080/j.issn1671–833x.2019.11.032.

ZHANG Congyang, ZOU Rimao, YU Zuyuan. Study on Micro EDM Aided by Ultrasonic Vibration in Nitrogen Plasma Jet. Aeronautical Manufacturing Technology, 2019, 62(11): 32-38. DOI： 10.16080/j.issn1671–833x.2019.11.032.

摘要

冷等离子体射流中微细电火花加工在一定程度上获得了比纯气体介质中更好的加工性能。然而由于放电脉冲能量小，造成放电间隙小，使得电蚀产物排出困难，短路、拉弧等不正常放电现象仍然频繁发生，严重影响了加工的质量和稳定性。为此，提出在工件上施加超声振动的方法以改善冷等离子体射流中微细电火花加工过程的稳定性，并探究其加工特性。针对电火花加工的击穿距离、材料去除率、表面粗糙度以及工具电极相对损耗率等工艺指标，进行了工艺试验。试验结果表明：工件施加超声振动以后，熔融的电蚀产物更容易从工件表面剥离；当以冷等离子体和压缩空气混合射流为加工介质时，超声辅助等离子体中微细电火花加工性能得以明显改善，材料去除率提高13%，表面粗糙度降低19%，电极相对损耗率降低13%。

Abstract

The micro-EDM in nitrogen plasma jet (NPJ) obtained better processing performance than that in gas. However

due to the small discharge gap and the difficult exfoliation of the molten material

the abnormal discharge phenomena such as short circuit and arcing still occurred frequently. These phenomena seriously affected the quality and stability of the processing. In this paper

a new method of applying ultrasonic vibration to the workpiece is proposed to improve the processing performance of micro-EDM in NPJ. The process experiments were carried out on process indexes such as discharge distance

material removal rate (MRR)

surface roughness and tool electrode relative wear rate (TWR) of EDM. The experimental results show that after the ultrasonic vibration is applied to the workpiece

the molten material is more easily exfoliated from the surface of the workpiece. When the mixture of nitrogen plasma jet and high velocity air jet (NPJ+HVAJ) is used as the dielectric in the proposed method

the MRR increased by 13%

the surface roughness decreased by 19%

and the TWR decreased by 13%.

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