电极摇动对微细电火花加工微孔深径比的影响  

Effects of Planetary Movement of Electrode on Aspect Ratio of Micro Hole Drilled by Micro EDM

作　　者：朱应宝[1] 余祖元[1] 李剑中[1] 郭学杰[1] 殷国强[1] ZHU Yingbao;YU Zuyuan;LI Jianzhong;GUO Xuejie;YIN Guoqiang(Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education,Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,大连116024

出　　处：《航空制造技术》2017年第3期56-61,共6页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金资助项目(51475075);高等学校博士学科点专项科研基金资助项目(20120041110033)

摘　　要：微细电火花具备加工任何导电材料和大深径比微孔的能力。但是随着孔深度的增加,气泡和加工屑很难排出孔外,导致频繁的非正常放电,从而使得电火花常规放电状态下微孔的深径比有限,然而电极摇动可以为电火花狭小放电间隙提供一个非均匀的流场,提高了排屑能力,这有助于提高微孔的深径比。着重研究微孔加工在去离子水和油两种介质下,电极摇动参数和电参数对微孔深径比的影响。试验结果表明:电火花常规放电状态下微孔的深径比随着摇动半径和电容的增加而增加,摇动速度对微孔深径比则没有明显的影响,这为实际生产中加工大深径比微孔提供了参考依据。Micro EDM has the ability to drill high aspect ratio micro holes in metallic materials.With the increasingof depth of micro holes drilled by micro EDM,abnormal discharges appears frequently because machining debris andgaseous bubbles cannot be effectively removed from hole.Therefore,the aspect ratio of micro hole is limited.While theplanetary movement of electrode can increase the aspect ratio of micro hole duo to improving machining debris removalability.The impact factors of the planetary movement parameters and electrical parameters on the aspect ratio of micro holeare studied,Experimental results indicate that the aspect ratio of micro hole increases along with the increase of eccentricradius and capacitor under different machining conditions.The planetary movement speed is irrelevant to the aspect ratio ofmicro hole.These results are helpful for actual production to improve the aspect ratio of micro hole.

关 键 词：微细电火花加工 电极摇动 深径比 摇动半径 摇动速度 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]