摘要
短电弧加工过程中大量的蚀除颗粒分布在底面及侧面窄隙处,形成“富集区”。当蚀除物不能及时排除将会造成极间放电状态发生变化,引起“二次放电”,导致加工工件精度降低以及电极损耗量大,严重时会引起短路现象而无法正常加工。利用FLUENT软件对短电弧铣削加工中蚀除颗粒在窄隙中的分布状态及排除方式进行仿真研究,选择DPM模型对颗粒进行跟踪计算。通过模拟研究不同加工深度下粒子在窄隙中的分布规律,并结合实验对其进行验证发现,加工深度的变化对工件表面质量影响不显著。当加工深度为3mm时,流场速度较大且颗粒在拐角处分布稀疏,有利于排屑,可提高短电弧加工的稳定性。
In the short arc machining process,a large number of etched particles will be distributed in the bottom and side narrow gap,forming a rich area.When the etched material cannot be removed in a timely manner,it will cause the change of the inter-electrode discharge state and cause secondary discharge,which leads to the reduction of the workpiece precision and the loss of the electrode.In this paper,FLUENT software is used to carry out simulation research on the distribution state and removal mode of the etched particles in the narrow gap in the short arc milling process,and DPM model is selected for particle tracking calculation.By simulating and studying the distribution law of particles in narrow gaps at different machining depths and verifying with experiments,it is concluded that the change of machining depth has no significant influence on the surface quality of workpiece.When the machining depth is 3mm,the flow field velocity is large and the particles are thinly distributed at the corners,which is conducive to chip removal and improves the stability of short arc machining.
作者
吴敏
常星星
高茂洋
马浩骞
Wu Min;Chang Xingxing;Gao Maoyang;Ma Haoqian(Anhui Tianhang Electromechanical Co.,Ltd.,Wuhu,Anhui 241000,China;不详)
出处
《工具技术》
北大核心
2022年第10期109-113,共5页
Tool Engineering
