摘要
在微细电火花加工(EDM)中电极损耗是不可避免的,而针对电极损耗的研究大都是在油工作液中,很少针对气中放电时的电极损耗进行研究.气中电火花加工普遍采用管状电极,所以为了获得尺寸更小的工件,通过反拷块可磨削出微米级的实心电极,并采用外部充气的方式,可实现微米级三维结构的气中电火花加工.实验考虑了影响气中放电电极损耗的各种因素.通过观察微细电火花三维铣削放电现象与结果,可得到气中放电的规律.由于电火花加工中电极损耗是不可避免的,所以在三维铣削加工中对电极进行在线检测并补偿,工件成形精度大大提高.对刀具路径进行合理规划,可以缩短加工时间.与油中电火花铣削相比,气中电火花加工时电极损耗更低,加工表面质量更好.
Electrode wear commonly exists in micro-electrical discharge machining （EDM）. It was wide- ly studied in micro-electrical discharge milling in oil dielectric medium, rarely in air. The electrode used in gas-EDM is tubular. In order to get smaller size parts, the solid micron-sized electrode machined by copying block was used in this paper. The gas was ejected to the workpiece by an gir compressor. The electrode wear and machining velocity in micro-electrical discharge milling in air were studied. The influ- ence factors that induced electrode wear were considered during the experiments. The characteristics of micro-EDM milling in air were analysed through the phenomenon and results of 3D micro-electrical dis- charge milling experiments. Since electrode wear is inevitable, an on-line electrode wear compensation control strategy was proposed to meet the requirements of micro-EDM milling process. The machining pre- cision is improved by this method. Due to the slow machining velocity in air, a strategy of tool path plan- ning was conducted to reduce machining time. Compared with milling in oil dielectric medium, the elec- trode wear in air is smaller. And the surface quality is better than that machined in oil. It is proved that milling time in air was reduced prominently by this direct cross tool path.
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2012年第1期83-88,共6页
Nanotechnology and Precision Engineering
基金
国家自然科学基金资助项目(50835002)
黑龙江省自然科学基金资助项目(E200901)
哈尔滨科技创新专项基金资助项目(2010RFQXG016)
关键词
微细电火花加工(EDM)
三维铣削
电介质
电极损耗
micro-electrical discharge machining （EDM）
3D milling
dielectric medium
electrode wear
