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

毕方淇; 李丽; 吴亚州

doi:10.13433/j.cnki.1003-8728.2016.0624

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

doi: 10.13433/j.cnki.1003-8728.2016.0624

1.
山东理工大学机械工程学院, 淄博 255000

基金项目:

国家自然科学基金项目(51105235)资助

详细信息

作者简介:
毕方淇(1988-),硕士研究生,研究方向为特种加工与表面强化,56208585@qq.com

通讯作者:
李丽(联系人),副教授,博士,sdutlili@163.com

计量
- 文章访问数: 308
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- PDF下载量: 15
- 被引次数: 0
出版历程
- 收稿日期: 2014-06-23
- 刊出日期: 2016-06-05

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

1.
School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China

摘要

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Ø0.3~Ø3 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。
- 稳态流场 /
- 瞬态分析 /
- 温度场 /
- Inconel718
Abstract: 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 Ø0.3~Ø3 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.
- flow fields /
- inconel718 /
- temperature /
- transient analysis

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参考文献(15)

[1]	Ezugwu E O. Key improvements in the machining of difficult-to-cut aerospace superalloys[J]. International Journal of Machine Tools and Manufacture, 2005,45(12/13):1353-1367
[2]	李丽,魏修亭,程祥.镍基高温合金IN718电火花加工初步试验研究[J].制造业自动化,2013,35(2):54-57 Li L, Wei X T, Cheng X. Surface integrity of nickel alloy IN718 after electrical discharge machining[J]. Manufacturing Automation, 2013,35(2):54-57(in Chinese)
[3]	朱派龙,戚长政,温志远,等.超大深径比深小孔的工艺方法和电极研制[J].机械工程学报,2006,42(2):198-202 Zhu P L, Qi C Z, Wen Z Y, et al. Process approach with its electrode design and manufacturing for deep micro-hole of extra large aspect ratio[J]. Chinese Journal of Mechanical Engineering, 2006,42(2):198-202(in Chinese)
[4]	彭受智.特种高温合金深小孔的电火花加工[J].航空制造技术,2002,(4):34-37 Peng S Z. EDM machining small deep hole of special high melting point alloy[J]. Aeronautical Manufacturing Technology, 2002,(4):34-37(in Chinese)
[5]	卢桂琴.电火花加工中的电极损耗机理及控制研究[D].南昌:南昌大学,2009 Lu G Q. EDM electrode wear mechanism and control research[D]. Nanchang:Nanchang University, 2009(in Chinese)
[6]	张雷.深小孔微细电火花加工间隙流场仿真及实验研究[D].哈尔滨:哈尔滨工业大学,2011 Zhang L. Simulation and experiment research of gap flow for micro-EDM deep-small hole machining[D]. Harbin:Harbin Institute of Technology, 2011(in Chinese)
[7]	张雷,王玉魁,耿雪松,等.削边电极深小孔微细电火花间隙流场仿真研究[J].电加工与模具,2011,(3):33-37 Zhang L, Wang Y K, Geng X S, et al. Gap flow simulation for micro-edm deep-small hole machining with flatted electrode[J]. Electromachining & Mould, 2011,(3):33-37(in Chinese)
[8]	黄志刚,郭钟宁.单脉冲电火花加工温度场的有限元分析[J].广东大学学报,2002,19(4):38-43 Huang Z G, Guo Z N. Finite element analysis on temperature field by single spark discharge in EDM[J]. Journal of Guangdong University of Technology, 2002,19(4):38-43(in Chinese)
[9]	李建功,许加利,裴景玉.基于Fluent电火花深小孔加工间隙流场的研究[J].电加工与模具,2009,(2):18-22 Li J G, Xu J L, Pei J Y. Gap flow research for deep-small hole drilling by EDM based on fluent software[J]. Electromachining & Mould, 2009,(2):18-22(in Chinese)
[10]	刘庆明,汪建平,李磊,等.电火花放电能量及其损耗的计算[J].高电压技术,2014,40(4):1255-1260 Liu Q M, Wang J P, Li L, et al. Calculation of electric spark discharge energy and its energy loss[J]. High Voltage Engineering, 2014,40(4):1255-1260(in Chinese)
[11]	刘志东,高长水.电火花加工工艺及应用[M].北京:国防工业出版社,2011 Liu Z D, Gao C S. EDM technology and applications[M]. Beijing:Defense Industry Press, 2011(in Chinese)
[12]	张朝晖.ANSYS12.0分析工程应用实战手册[M].北京:中国铁道出版社,2010 Zhang C H. ANSYS12.0 Analysis of engineering applications manual[M]. Beijing:China Railway Press, 2010(in Chinese)
[13]	刘永忠,王乐.多孔介质中超临界流体可调特性的模拟与分析-温度梯度的作用[J].高校化学工程学报,2008,22(6):915-920 Liu Y Z, Wang L. Simulation and analysis of tunable performances of supercritical fluid flow in porous medium-effect of temperature gradients[J]. Journal of Chemical Engineering of Chinese Universities, 2008,22(6):915-920(in Chinese)
[14]	Shao B, Rajurkar K P. Micro-EDM pulse energy distribution ratio determination[C]//Proceedings of the 8th International Conference on Micro Manufacturing. Victoria, Canada:ICOMM, 2013:318-323
[15]	Zahiruddin M, Kunieda M. Energy distribution ratio into micro EDM electrodes[J]. Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2010,4(6):1096-1106