介质氧化特性对钛合金电火花加工电极损耗的影响研究

Research on the Influence of Dielectric Oxidbility on Electrode Wear in EDM of Titanium Alloy

研究了工作介质的氧化特性对钛合金电火花加工电极绝对损耗、相对损耗率及电极表面微观形貌的影响规律。结果表明,具有氧化特性的工作介质可在加工过程中使电极氧化,并在电极表面形成一层氧化保护膜,减小带电粒子对基体的轰击,从而降低电极绝对损耗;介质的氧化特性也会对钛合金电火花加工效率和排屑产生影响,使电极相对损耗率呈先减小、后增长、再趋于稳定的趋势;极间氧气增多能增大放电爆炸力,使电极表面微裂纹和气孔数量增多;工作介质存在一个最佳氧化性能,可使钛合金加工的电极损耗达到最佳状态。

This paper has studied how the oxidbillity of dielectric will influence the processability of titanium alloy EDM,such as electrode absolute wear, electrode relative wearing rate and electrode surface microsmic topography. The result shows that dielectrics of oxidbillity can oxidize the electrode during processing and form an oxide layer on it which can reduce the bump of electronics to the electrode,thereby its absolute wear is lower. The oxidbillity of dielectric will affect the material removal rate and the expulsion of elaboration product in titanium alloy EDM to make the electrode relative wearing rate increase after decrease,and then to stability. The more oxygen there is in the discharge gap,the bigger the explosive power will be,which will produce more microcracks and gas holes on electrode surface. There is an optimal range for the oxidbillity of dielectric to make the electrode wear of titanium alloy EDM achieve better machining effect.