电火花线切割加工中电极丝所受电磁力分析  

Analysis of Electromagnetic Force Applied to Wire Electrode in Wire-EDM

作　　者：上官同英[1] 张臻[2] 陈志[2] 明五一[2] 

机构地区：[1]中州大学工程技术学院,河南郑州450015 [2]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《机械设计与制造》2014年第11期112-114,共3页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(No.51175207)

摘　　要：在电火花线切割加工过程中,电极丝沿着导轮上下运转,同时电极丝受到多种力的作用,例如放电爆炸力、电场力、电磁力、水流冲击力等,其中所受的电磁力对加工效果(效率和精度)有着重要的影响。因此,从机理上分析了加工不同工件时电极丝周围的磁通密度分布,采用多物理耦合建模方法,应用泊松方程,再根据电极丝的实际加工情况,建立二维稳态的电磁场模型,并分析电磁力对电极丝的作用。在不同的放电电流和放电间隙条件下,仿真得到磁场强度分布和电极丝所受电磁力。本研究可以为电火花线切割加工过程中的电极丝张力和拐角误差控制提供一定的理论依据。In the wire electrical discharge machining （WEDM）, the wire electrode moving between upper guide and lower guide is subjected to lots of force, such as discharge explosive force, electric field farce, electromagnetic force and water impact. Then electromagnetic farce has a significant impact on the performance of WEDM including efficiency and accuracy. Therefore, it clarified how the magnetic flux density near the wire electrode was distributed when the different materials were machined. Based on actual processing of the wire electrode, a two-dimensional steady model of electromagnetic fields had been developed to analyze the mechanism of how electromagnetic force applied to the wire electrode was generated by using multi-physh＇s coupling method and Poisson equation. On the condition of various discharge current and discharge gap, the distribution of magnetic field intensity and electromagnetic force applied to the wire electrode can be obtained by numerical simulation. It can provide theoretical evidence for the control of wire tension and corner error in WEDM.

关 键 词：电火花线切割 电极丝 电磁力 多物理耦合 泊松方程 

分 类 号：TH16[机械工程—机械制造及自动化] TG661[金属学及工艺—金属切削加工及机床]