电火花加工参数对蚀除微粒粒度分布影响规律的研究
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摘要
电火花加工是金属粉末制备的重要加工方法,用于纯金属、合金等粉末的制备。为制备给定直径范围的粉末,需要选择合适的加工工艺参数。此外,在电火花加工中,蚀除颗粒对放电间隙电场及流场有较大影响,颗粒粒度大小直接影响了场相关有限元仿真分析的计算结果。研究了主要放电加工参数及工作液类型对金属粉末直径分布的影响规律,调节电参数进行电火花加工实验,收集蚀除微粒,通过检测微粒直径分布以及微粒形貌,得出电参数对放电加工制备金属粉末的影响机理。结果表明:工作液类型对微粒粒径影响较大,放电电流及脉宽对微粒粒径分布影响规律不同。所得规律对粉末制备生产过程及电火花间隙流场仿真有一定的指导意义。
Electrical discharge machining is a significant technique to manufacture metal powder including fine metal and alloy metal powder. In order to preparing powder which diameter have been given,technological parameters must be chosen necessarily and reasonably. The effect of mian technological parameters and types of operating fluid on diameter distribution of metal powders has been researched. Adjusting the technological parameters and drilling holes by electro-discharge machining can acquire erosion particles with different diameters. Then collecting the erosion particles to detecting diameter distribution and the topography of particles is necessary. Experimental results indicate that the types of operating fluid has a greater impact on diameters. It also turned out that effect of electric current and pluse width on distribution of diameters are different. These conclusions may guide metal powder preparation.
Electrical discharge machining is a significant technique to manufacture metal powder including fine metal and alloy metal powder. In order to preparing powder which diameter have been given,technological parameters must be chosen necessarily and reasonably. The effect of mian technological parameters and types of operating fluid on diameter distribution of metal powders has been researched. Adjusting the technological parameters and drilling holes by electro-discharge machining can acquire erosion particles with different diameters. Then collecting the erosion particles to detecting diameter distribution and the topography of particles is necessary. Experimental results indicate that the types of operating fluid has a greater impact on diameters. It also turned out that effect of electric current and pluse width on distribution of diameters are different. These conclusions may guide metal powder preparation.
引文
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[3]鲍俊敏,葛昌纯,郭双全.火花等离子体放电法制备高温合金粉末[J].粉末冶金工业,2010(1):14-19.(Bao Jun-min,Ge Chang-chun,Guo Shaung-quan.Preparation of superalloy powder by spark plasma discharge[J].Powder Metallurgy Industry,2010(1):14-19.)
[4]Gokul Vasudevamurthy,Travis W.Knight.Effect of system parameters on size distribution of 304 stainless steel particles produced by electrical discharge mechanism[J].Materials Letters,2007(61):4872-4874.
[5]E.D.Cabanillas,M.Lopez,E.E.Pasqualini,D.J.Cirilo Lombardo.Production of uranium-molybdenum paiticles by spark-erision[J].Journal of Nuclear Materials,2004(324):1-5.
[6]Liu Yi-fan,Li Xiang-long,Bai Fus-hi.Effectofsystem parameters on the size distributions of hollow nickelmicrospheres produced by an ultrasoundaided electrical dischargemachining process[J].Particuology,2014(17):36-41.
[7]苏宏志,赵福令,王元刚.粉末对混粉电火花液固混合工作液的作用机制[J].机械设计与制造,2010(5):113-115.(Su Hong-zhi,Zhao Fu-ling,Wang Yuan-gang.Function of powders on powder-liquid two-phase mixture in Powder Mixed EDM[J].Machinery Design&Manufacture,2010(5):113-115.)
[8]白基成,刘晋春.特种加工[M].北京:机械工业出版社,2013.(Bai Ji-cheng,Liu Jin-chun.Non-Traditional Machining[M].Beijing:China Machine Press,2013.)
[9]Carrey J,Radousky H B,Berkowitz A E.Spark-eroded particles:influence of processing parameters[J].Journal of Applied Physics,2004,95(3):823-829.
[10]刘媛,曹凤国,桂小波.电火花加工放电爆炸力对材料蚀除机理的研究[J].电加工与模具,2008(5):19-25.(Liu Yuan,Cao Feng-guo,Gui Xiao-bo.Research on the mechanism of material erosion based on explosion force in EDM[J].Electromachining and Mould,2008(5):19-25.)