摘要：微细电火花加工作为重要的非传统加工技术广泛应用于精密制造等领域，但加工效率低和加工质量差等问题严重制约了微细电火花加工技术的发展。为了改善微细电火花加工存在的问题，将磁场与微细电火花加工相结合，在不同的电极转速条件下研究外加磁场对Ti6Al4V微孔加工性能、加工精度和表面质量的影响。加工性能由材料去除率和电极磨损率表征，加工精度由过切和锥度表征，根据表面粗糙度和表面形貌来评估表面质量。试验结果表明：采用磁场微细电火花复合加工方法在Ti6Al4V上加工微孔时，材料去除率和电极磨损率增大，过切和锥度减小，表面粗糙度降低，加工精度和表面质量均得到改善。

关键词：微细电火花加工；磁场辅助；Ti6Al4V；表面质量

中图分类号：TG661；TH161.1文献标志码：ADOI：10.3969/j.issn.1000-7008.2021.07.004

Effect of Magnetic Field on Ti6Al4V Microholes in MicroEDM

Qu Yongqiang，Xu Jinkai，Yu Peng

Abstract:MicroEDM is an important nontraditional machining technology，which is widely used in precision manufacturing and other fields.However，the low processing efficiency and poor processing quality have seriously restricted the development of microEDM technology.In order to improve the problems of microEDM，the magnetic field and microEDM are combined together.Under different electrode speed conditions，the effect of external magnetic field on Ti6Al4V microhole machining performance，machining accuracy and surface quality is studied.Machining performance is characterized by material removal rate and electrode wear rate.Machining accuracy is characterized by overcut and taper，and the surface quality is evaluated based on surface roughness and surface topography.The result shows that using the compound machining method of magnetic field and microEDM to fabricate microholes on the Ti6Al4V，its material removal rate and electrode wear rate increase，overcut and taper decrease，surface roughness decreases，machining accuracy and surface quality are improved.

Keywords:microEDM；magnetic field assist；Ti6Al4V；surface quality