电火花深小孔加工有限元仿真——稳态流场下单脉冲放电瞬态温度场分析  

FEM Simulation of Deep Small Hole Edm-Transient Temperature Field Analysis of Single Pulse Discharge under Steady-State Flow

作　　者：毕方淇 李丽[1] 吴亚州 

机构地区：[1]山东理工大学机械工程学院,山东淄博255000

出　　处：《机械科学与技术》2016年第6期956-960,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51105235)资助

摘　　要：现有仿真均针对静流场或不考虑流场,不能较好地符合Φ0.3~Φ3 mm深小孔和6 MPa内冲液冷却实际加工状况。为反映实际加工Inconel718过程中稳态流场下单脉冲瞬态温度场,采用ANSYS Flotran CFD模块,对镍基高温合金Inconel718深小孔电火花加工单脉冲温度场进行仿真。首先进行稳态流场分析,并以稳态流场为基础,加载热生成载荷,分析其瞬态温度场。仿真得出,稳定流场下,加工部位温度场并非完全对称,而是随工作介质流动方向出现一定＂偏吹＂;同时在单脉冲下,工件局部会受热熔化但紫铜电极不会出现损耗,工具电极损耗原因为连续加工中散热不及时而导致的。The existing simulations of temperature field in deep small hole EDM are often implemented based on static flow fields or without considering flow fields,they can not reflect the actual machining process includes 6 MPa internal cooling liquid inside the tool-electrode when machining small holes between Φ0.3 ~ Φ3 mm. The In order to reflect the real situation of Nickel-base superalloy Inconel718,the ANSYS Flotran CFD was used to simulate the process of deep small hole machining. First,a steady-state flow field analysis was conducted. Second,HGEN（ Heat Generation） loads were loaded onto the model,and the transient analysis of temperature field was conducted,we can figure out that in steady-state flow field the temperature field is not symmetric but being blown by the flow. At the same time,part of the work-piece were be melted while copper tool-electrode is not affected by a single discharge. It is found that the reason for tool-electrode wears is the insufficient cooling in real machining process.

关 键 词：稳态流场 瞬态分析 温度场 INCONEL718 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]