蚀除颗粒对短电弧铣削加工放电状态影响研究  

Effect of removal particles on discharge state in short arc milling

作　　者：张晟晟 胡国玉[1] 周建平[1] 张立 ZHANG Shengsheng;HU Guoyu;ZHOU Jianping;ZHANG Li(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,CHN)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830047

出　　处：《制造技术与机床》2020年第12期77-81,共5页Manufacturing Technology & Machine Tool

基　　金：自治区自然科学基金项目:短电弧放电加工中气液两相流介质作用下极间电解效应机理研究(2019D01C070);国家自然科学基金项目:短电弧高效铣削加工极间流固耦合及非稳态放电特性研究(51765063)。

摘　　要：针对短电弧铣削加工工件表面质量低,形状精度差的问题,建立三维流场模型,对加工间隙流场进行仿真。分析了极间压力场、速度场对蚀除颗粒分布规律的影响,并模拟极间不同位置处颗粒的放电状态,通过单因素实验验证了仿真结果的正确性。研究表明:蚀除颗粒受间隙负压的影响,主要分布于电极中心孔及边缘附近,使局部电场集中,增大了铣削凹槽中间区域的放电凹坑数量及深度,通过增大冲液压力改变蚀除颗粒的分布状态,可明显提高工件表面质量和形状精度。For the problems of low surface quality and poor shape precision in short arc milling,the flow field simulation model is established and the effects of interelectrode pressure field and velocity field on the distribution of particles removal are analyzed while the discharge state of the particles at different positions between the poles is simulated.The simulation results are verified by single factor experiment.The results show that the removal particles are mainly distributed near the center hole and edge of the electrode under the influence of the gap negative pressure,so that the local electric field is concentrated,the amount and depth of the discharge pits in the middle area of milling groove are increased.The distribution state of the removal particles can be changed by increasing the flushing pressure and hence the surface quality and the shape precision of the workpiece are obviously improved.

关 键 词：短电弧铣削加工 蚀除颗粒分布 放电状态 电场集中 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]