微细电火花深沟槽螺旋电极钛合金微孔加工  

Micro-hole Machining of Titanium Alloy with Micro-EDM Deep Groove helical Electrode

作　　者：许金凯[1] 马光胜 于朋 崔广续 XU Jin-kai;MA Guang-sheng;YU Peng;CUI Guang-xu(School of Mechatronic Engineering,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学机电工程学院

出　　处：《长春理工大学学报（自然科学版）》2019年第6期29-33,共5页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省重点科技项目(20180201057GX);吉林省科技发展规划(20190101005JH);中国“111”工程(D17017)

摘　　要：在微细电火花微小孔精密加工中,由于微孔精密加工脉冲能量小,使电极与工件之间产生的放电间隙较小,当微孔加工深度较深时电蚀产物难以从狭小的放电间隙排出,过多的电蚀产物会增加二次放电概率和造成放电频繁短路,使加工回退,造成加工不稳定。为改善加工状态采用单旋深沟槽螺旋电极进行加工实验,实验通过制备Φ0.21 mm单旋深沟槽螺旋电极对Ti6Al4V进行微孔加工。并通过对不同沟槽深度的电极进行大量实验。实验结果得出深沟槽螺旋电极能明显的改善微孔加工质量、降低加工时间和减小电极损耗。并且当沟槽深度为直径的50%时电极损耗最小,沟槽深度为直径的60%时微孔加工形貌最优。In the precision machining of micro-holes by micro-EDM,the discharge gap between the electrodes and the workpiece is small because of the small pulse energy in the precision machining of micro-holes.When the depth of mi-cro-hole processing is deeper,it is difficult for the corrosion products to be removed from the narrow discharge gap.Too many corrosion products will increase the probability of secondary discharge and cause frequent short circuit of dis-charge,which will make the processing backward and unstable.In order to improve the processing condition,sin-gle-spin deep groove helical electrode was used for processing experiments.The experiment was carried out on Ti6Al4V by fabricating 0.21mm single-spin deep groove helical electrode.A large number of experiments were carried out on electrodes with different groove depths.The experimental results show that the deep groove helical electrode can significantly improve the quality of micro-hole processing,reduce the processing time and the electrode loss.Moreover,when the groove depth is 50%of the diameter,the electrode wear is the smallest;and when the groove depth is 60%of the diameter,the micro-hole processing morphology is the best.

关 键 词：螺旋电极 微细电火花 钛合金微孔加工 电极损耗 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]