镍基高温合金多孔质电极电火花加工实验研究  

Experimental Study on Electro-discharge Machining of Ni-based High Temperature Alloy with Porous Electrode

作　　者：孔令蕾 蒋毅[1] 平雪良[1] 赵万生[2] 李其[1] 

机构地区：[1]江南大学机械工程学院/江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [2]上海交通大学机械与动力工程学院,上海200240

出　　处：《电加工与模具》2015年第2期8-12,共5页Electromachining & Mould

基　　金：国家自然科学基金资助项目(51205169)

摘　　要：采用一种由紫铜颗粒经高温烧结获得的多孔材料作为工具电极,并施加内冲液,分别在不同的加工方式、峰值电流、冲液流量和脉冲宽度下,对镍基高温合金GH4169进行多孔质电极电火花加工实验研究。结果表明:由于采用了分布式的内冲液,多孔质电极能以不抬刀方式加工,可获得比实体电极更高的材料去除率和更低的工具电极损耗率。但分布式内冲液对极间状态的改善作用受到峰值电流、脉冲宽度所导致的蚀除产物粒径的影响,当蚀除产物粒径过小或过大时,多孔质电极相对于实体电极的优势无法体现。A kind of porous material which is prepared by high temperature sintering of copper particles is applied as the tool electrode for electro-discharge machining of Ni-based high temperature alloy with inner-flushing. Experiments was carried out with different processing mode ,peak current, liquid flow rate and pulse width. Experimental results show that without tool lifting,higher material removal rate and lower tool electrode is able to be achieved by using porous electrqde than that of solid electrode,due to the distributed inner-flushing. But the improving effect of distributed inner-flushing on gap status is influenced by the debris size caused by peak current and pulse width. When the debris size is too large Or too small, the advantage of porous electrodes relative to solid electrodes can not be reflected.

关 键 词：电火花加工 多孔质电极 镍基高温合金 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]