气雾介质放电诱导烧蚀成形加工技术研究

Study on the Technology of Forming Processing by Spark-induced Combustion in Aerosol Medium

利用氧气与水产生雾化工作介质,使金属与间歇通入极间的气雾介质发生烧蚀,以获得较高的材料去除率。在氧气关闭阶段,则通过内冲液对烧蚀表面进行电火花加工修整,去除烧蚀产生的氧化层,在提高蚀除效率的同时,获得较好的表面质量(简称冲液雾化烧蚀)。分析了该加工方法的极间放电状态及微观加工过程,并以Cr12工件进行成形加工实验,与常规水中电火花加工及间歇通氧烧蚀加工进行对比,结果表明:冲液雾化烧蚀加工的材料去除率比间歇通氧烧蚀加工提高近1.45倍,比常规水中电火花加工提高约9.59倍;电极质量相对损耗比间歇通氧烧蚀加工增加约45%,比常规水中电火花加工减少近50%;加工表面比间歇通氧烧蚀加工更光整,表面微观形貌与常规水中电火花加工更接近,且无明显烧蚀重熔颗粒。

The jetted liquid and atomization ablation is a process which uses the aerosol generatedby oxygen and water as the discharge medium to imprbve the material removal rate and get a bettersurface quality at the same time. In the stage of oxygen injection, ablation occurs between the metal andthe aerosol medium to obtain a higher material removal rate,and in the stage of no oxygen,the oxidelayer covering ablation surface is trimmed by EDM of inner jetted dielectric. The inter-electrodedischarge status and micro-machining process Of this process are researched. And the new process iscompared with conventional EDM and ablation machining in intermittent oxygen medium using Crl2 asthe work-piece. The results show that the material removal rate of jetted liquid and atomization ablationis nearly 1.45 times of ablation in intermittent oxygen medium,and about 9.59 times of conventionalEDM. The quality relative rate of electrode improves about 50 % than ablation in intermittent oxygenmedium,and nearly 40 % lower than conventional EDM. The finished surface is closer to theconventional EDM which has no obvious remelted ablation particles. It is smoother than the theablation surface in intermittent oxygen medium.