Compared with a copper wire electrode,molybdenum wire with a poor conductor is usu-ally used as the electrode in high speed wire-cut electrical discharge machining (HSWEDM),so the resistance of an ultra-fine wire cannot be ignored.To study the differences of discharge character-istics between the ultra-fine wire and the conventional diameter wire,the continuous discharge waveform of two kinds of wire electrodes was compared.It was found that there was a multi-channel discharge phenomenon in the discharge waveform cutting by ultra-fine wire.Through the establishment of a discharge equivalent circuit model and the simulation analysis of the electro-static field,it was found that the reason why ultra-fine wire is easy to form multi-channel discharge phenomenon is that the potential difference between the wire and the workpiece increased linearly along the axis of the wire.Besides,etching products like metal particles will distort the electric field between the electrodes.Both of them make it easy to form a multi-channel discharge in machining.The results show that the distributions of the equivalent resistance and the peak current are affected by the multi-channel discharge position.Multi-channel discharge can disperse energy and increase effective discharge frequency.Compared with the 0 mm spacing,at a spacing of 100 mm,the machining efficiency increases by 8.7％,the surface roughness decreases by 37.7％,and the average recast layer thickness decreases by 46.6％ under the condition of ultra-fine wire-EDM.

Ming ZHANG;Zhidong LIU;Hongwei PAN;Cong DENG;Mingbo QIU

College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

中国航空学报（英文版）

[1]Ming ZHANG;Zhidong LIU;Hongwei PAN;Cong DENG;Mingbo QIU-.Multi-channel discharge characteristics cutting by ultra-fine wire-EDM)[J].中国航空学报（英文版）,2022(02):308-319

HSWEDM

Multi,channel,discharge,characteristics,cutting,by,ultra,fine,wire,Compared,copper,molybdenum,poor,conductor,usu,ally,used,high,speed,electrical,machining,resistance,cannot,ignored,To,study,differences,between,conventional,diameter,continuous,waveform,two,kinds,electrodes,was,compared,It,found,that,there,multi,phenomenon,Through,establishment,equivalent,circuit,model,simulation,analysis,static,field,reason,why,easy,potential,workpiece,increased,linearly,along,axis,Besides,etching,products,like,metal,particles,will,distort,Both,them,make,results,show,distributions,peak,current,affected,position,disperse,energy,effective,frequency,spacing,efficiency,increases,surface,roughness,decreases,average,recast,layer,thickness,under,condition

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