金刚石烧结电极放电烧蚀加工蚀除机理  

The Mechanisms of Processing by Spark-induced Combustion with Sintered Diamond Electrode

作　　者：邱明波[1] 凌加健[1] 陈龙海[1] 刘志东[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《机械工程学报》2015年第3期190-195,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51205197;51175256);航空科学基金(2011ZE52060);江苏省自然科学基金(Bk2011732)资助项目

摘　　要：为了提高电火花加工效率,采用内部随机分布金刚石颗粒的管状烧结磨头作为放电诱导烧蚀加工电极。首先利用烧结电极金属基体和钛合金材料产生电火花诱导放电,通过电极内部进气孔冲入助燃氧气,使材料表面产生电火花诱导烧蚀。其次利用电极中的金刚石颗粒在线修整烧蚀加工的氧化表面,提高烧蚀效率及表面质量。对钛合金TC4进行钻削试验,从高效烧蚀加工及金刚石颗粒修整作用两个过程分别对该加工方法的微观蚀除机理做了具体分析,并与常规电火花钻削、紫铜电极烧蚀钻削进行对比,分析了材料去除率、表面质量等指标。结果表明,在相同试验条件下,金刚石烧结电极的烧蚀加效率是常规电火花钻削加工的14.5倍,并获得了近似机械加工的表面质量。Use the tubular sintered grinding head with random distribution of diamond particles inside as the electrode of spark-induced combustion. Electric spark discharge is induced by metallic matrix of the electrode and TC4, and though the oxygen inlet from the air intake inside of the electrode, spark-induced combustion is happened on the surface of TC4. Excessive oxide is removed by diamonds inside the electrode, and the surface quality can be improved. Test of TC4 drilling is processed. The analysis of mechanisms of processing and MRR and surface quality putted forward from park-induced combustion and finished by diamonds. And be contrasted with the drilling by EDM and normal red copper electrode. The results show that the machining efficiency of discharge combustion which is based on diamond sintered electrode is 14.5 times higher than the machining of conventional EDM drilling, and its surface quality is similar to mechanical treatment under the same experimental conditions.

关 键 词：钛合金 烧结电极 放电烧蚀 蚀除机理 TC4 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]