极间自混氧改善钛合金电火花加工特性研究

Research on Self-mixed Oxygen in Discharge Gap to Improve the Processing Characteristics of Titanium Alloy Electrical Discharge Machining

提出了极间自混氧钛合金电火花加工(EDM)方法。利用工作介质中的过氧化氢添加剂在加工区域自动产生氧气的方式,使极间处于氧气和液体混合存在的状态,有效改善钛合金EDM性能。研究了极间自混氧对材料去除率(MRR)、相对电极损耗(EWR)和表面质量(SQ)的影响。结果表明:材料去除率、相对电极损耗和表面粗糙度均随过氧化氢溶液含量的增加呈先增长后下降的趋势,电导率可作为过氧化氢溶液含量的衡量依据。

In this paper, a method based on self-mixed oxygen in a discharge gap is proposed for titanium alloy electrical discharge machining. In traditional mixed-air electrical discharge machining （EDM）, it is difficult for the gas to get into the discharge gap. To solve the problem, hydrogen peroxide is added into distilled water as dielectric to produce oxygen auto- matically during the machining process, which forms a new type of EDM based on self-mixed oxygen. The influence of self- mixed oxygen on material removal rate （MRR）, electrode wearing rate （EWR） and surface quality （SQ） is studied. Results show that when the content of hydrogen peroxide grows, MRR, EWR and SQ all present a tendency of first increasing and then decreasing. And the electrical conductivity of the dielectric can be taken as a basis when measuring the content of hy- drogen peroxide.