带微小内棱角穿透型窄槽的微细电火花加工  

Micro-EDM Process for Micro Through-slit with Inside Sharp Edge

作　　者：张龙[1] 佟浩[1,2] 李勇[1,2] 李岩 柴永生[1,3] 李朝将[1] 

机构地区：[1]清华大学机械工程系制造工程研究所/摩擦学国家重点实验室,北京100084 [2]精密超精密制造装备及控制北京市重点实验室,北京100084 [3]烟台大学机电汽车工程学院,山东烟台264005

出　　处：《电加工与模具》2013年第5期5-8,共4页Electromachining & Mould

基　　金：摩擦学国家重点实验室自主研究课题(SKLT11C5);精密超精密制造装备及控制北京市重点实验室开放课题(PMEC201202);中国博士后科学基金资助项目(2012M520254)

摘　　要：为实现带有微小内棱角穿透型窄槽的深度精度,消除内棱边圆角,提出了一种微细扁平成形电极穿槽电火花加工方法。该方法通过在线制作微细扁平电极,采用穿透成形加工方法,补偿加工中扁平电极损耗,实现微细窄槽的精密成形加工。在航空发动机压气机转子叶片上开展了验证性实验研究,加工出的缺陷槽宽度为85μm,深度为244μm,具有较明显的内棱角。In order to form the precision depth of micro through-slit with inside sharp edge,a novel micro EDM process was presented to machine the micro through slits using micro fiat electrodes to form the micro slits. The micro EDM process includes on-line fabrication of fiat electrodes and die- sinking EDM. During the die-sinking EDM, the fiat-electrode wear can be compensated by a penetrating length as the electrode passing through slit wall. The machining experiments were carried out on a blade of aeroengine compressor for the artificial crack slits, and the micro slit （85μm-wide and 244 μm-depth） with sharp edges was fabricated successfully.

关 键 词：航空发动机 微细电火花加工 叶片裂纹检测 扁平电极 微槽加工 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]