基于Fluent的电火花加工气泡分布对复合电极损耗的影响研究  

Research on the Influence of Bubble Distribution on Composed Electrode Loss in EDM Based on Fluent

作　　者：尹熠 吴江 李振源 裴景玉[1] YIN Yi;WU Jiang;LI Zhengyuan;PEI Jingyu(State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,机械系统与振动国家重点实验室,上海200240

出　　处：《电加工与模具》2023年第1期9-14,共6页Electromachining & Mould

基　　金：国家自然科学基金项目(51975370)。

摘　　要：在电火花铣削加工中,电极的形状损耗一直是限制加工精度的重要因素。而加工过程中气泡的产生及运动不仅影响电极放电,也影响电极损耗。为此,采用气液二相流仿真技术模拟气泡在一种复合电极表面区域内的运动,将不同尺寸电极下气泡的运动倾向进行比较与分析,首先绘制并调整电极模型,对内外电极的多个外缘进行圆角处理,以模拟电极在加工过程中的磨损情况;接着,调整电极模型的内外电极间隙尺寸及底面高度差,进行多组正交仿真实验;最后,比较和分析气泡在不同模型条件下的流动倾向与分布规律,讨论各因素对气泡产生及运动的影响。In EDM milling,the shape loss of the electrode has always been an important factor that limits the machining accuracy. The generation and movement of bubbles during processing are important factors that affecting electrode discharge,and then affects the shape loss of the electrode. This paper uses the gas-liquid two-phase flow simulation method to simulate the movement of bubbles in the surface area of a certain composite electrode,and compare and analyze the movement tendency of bubbles in different sizes of electrodes. In the thesis,the electrode models are first drawn and adjusted,and the outer edges of the inner and outer electrodes are rounded to simulate the wear of the electrode during the EDM milling process. Subsequently,the gap size of the inner and outer electrodes and the height of the bottom surface of the electrode models are adjusted and used in multiple sets of orthogonal simulation experiments. Finally, the thesis compares and analyses the flow tendency and the distribution law of bubbles under different sizes of electrode models,discussing the influence of various factors on bubble generation and movement.

关 键 词：电火花加工 电极损耗 二相流 仿真 气泡 复合电极 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]