电火花加工用多孔质电极内部流场仿真与优化  

On Simulation of Flow Field inside Porous-Electrode for Electrical Discharge Machining

作　　者：蒋毅[1] 孔令蕾 平雪良[1] 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

出　　处：《西南师范大学学报（自然科学版）》2016年第1期147-152,共6页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51205169)

摘　　要：为获得加工液在多孔质电极中流动的一般性规律,通过建立多孔质电极内部流道模型,采用数值方法对其内部流场进行了模拟仿真,并进行了实验验证.仿真结果与实验结果均显示普通多孔质电极的加工液大部分耗散于不参与加工的区域,加工液的利用率不高;采用裹覆铜箔的电极优化方法后,大幅提高了加工液利用率,但由于电极内部流道复杂狭窄,导致加工液的流动效率较低;进一步采用中空电极的优化方法后,其加工液利用效率不仅达到普通多孔质电极的5倍,也可减小加工液流动时的压力损失,提高加工液流动效率,获得较好的冲液效果.In order to obtain the flow behavior of the dielectric fluid inside porous electrodes,a inner flow channel model of porous electrodes has been set up and the flow field been simulated by numerical method as well as a series of experiments tests.Both simulation and experimental results show that most of the fluid in an ordinary porous electrode dissipates from the side face,which leads to a low utilization rate.By means of covering copper foil upon porous electrode,although the utilization rate is raised,the flow efficiency is still very low because of the complex narrow flow channel.By means of hollow porous electrode,the utilization rate is raised as high as 5times the ordinary porous electrode.Also,the pressure loss is reduced and the flow efficiency is improved,which leading to a good flushing effect.

关 键 词：电火花加工 多孔质电极 流场仿真 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]