纯钨材料环形微槽电解电火花加工特性研究
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摘要
为解决氙灯钨阳极表面密集环形微槽加工的技术问题,提出了采用RC电源,在超低电导率下电解电火花加工纯钨表面微沟槽的方法。研究在RC电源下,不同电解液类型下的电解电火花加工特性。首先,通过电化学工作站测量纯钨材料在不同电解液类型下的极化曲线,分析不同电解液类型的初腐蚀电位。为研究加工过程形成的气泡对加工的影响规律,通过高速摄像仪对不同工艺条件下加工区域的气泡形成与分布进行观察。最后,采用自主研制的试验装置开展了纯钨棒材表面环形微沟槽电解电火花加工工艺试验,分析工作液成分、电导率、转速和电压不同参数对加工特性的影响规律。在极间电压60V,转速500r/min,电导率为50μS/cm的NaOH电解液下加工了槽宽为50.97μm,槽深为17.31μm的微沟槽结构。
In order to solve the technical problem of dense micro grooves on the surface of xenon lamp tungsten anode, a method of electrochemical discharge machining(ECDM) of micro grooves on pure tungsten at low conductivity electrolyte was proposed, and RC power supply was applied into the process. The characteristics of ECDM with different electrolyte under RC power supply were studied. Firstly, the polarization curves of pure tungsten materials under different electrolytes were measured by electrochemical workstation, and the open circuit potential at different electrolytes was analyzed. In order to study the influence of the bubbles distribution during the processing, the bubbles formation and distribution in the machining area under different experimental conditions were observed by high-speed camera. Finally, the process of ECDM of micro-groove on the surface of pure tungsten rod was carried out with self-developed test device. The effects of electrolyte type, conductivity, rotational speed and inter electrode voltage on the machining characteristics were analyzed. Under 50μS/cm NaOH solution with an inter electrode voltage of 60 V and a rotating speed of 500 r/min, the micro groove with width is 50.97μm and the depth is 17.31μm was obtained by ECDM.
In order to solve the technical problem of dense micro grooves on the surface of xenon lamp tungsten anode, a method of electrochemical discharge machining(ECDM) of micro grooves on pure tungsten at low conductivity electrolyte was proposed, and RC power supply was applied into the process. The characteristics of ECDM with different electrolyte under RC power supply were studied. Firstly, the polarization curves of pure tungsten materials under different electrolytes were measured by electrochemical workstation, and the open circuit potential at different electrolytes was analyzed. In order to study the influence of the bubbles distribution during the processing, the bubbles formation and distribution in the machining area under different experimental conditions were observed by high-speed camera. Finally, the process of ECDM of micro-groove on the surface of pure tungsten rod was carried out with self-developed test device. The effects of electrolyte type, conductivity, rotational speed and inter electrode voltage on the machining characteristics were analyzed. Under 50μS/cm NaOH solution with an inter electrode voltage of 60 V and a rotating speed of 500 r/min, the micro groove with width is 50.97μm and the depth is 17.31μm was obtained by ECDM.
引文
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[4]尹飞鸿,蒋丽伟,何亚峰,等.电解加工新工艺及发展趋势[J].机械设计与制造工程,2018,47(1):13-17.YIN Feihong,JIANG Liwei,HE Yafeng,et al.New electrochemical processing technology and development trend[J].Mechanical Design and Manufacturing Engineering,2018,47(1):13-17.
[5]诸跃进.电解电火花复合加工深孔试验研究[J].电加工与模具,2012(6):47-50.ZHU Yuejin.Experimental study on deep hole machining by electrochemical discharge machining[J].Electromachining&Mould,2012(6):47-50.
[6]诸跃进,闫伟,张卫华,等.工作液对电解电火花复合加工工艺效果影响的试验研究[J].苏州科技学院学报(工程技术版),2013,26(1):76-80.ZHU Yuejin,YAN Wei,ZHANG Weihua,et al.Experimental research on the influence of low conductive electrolyte on technological effectin in electrochemical arc machining[J].Journal of Suzhou Institute of Science and Technology(Engineering Technology Edition),2013,26(1):76-80.
[7]尹青峰,王宝瑞,李建原,等.弱电解质中电解放电复合加工工艺技术[J].航空制造技术,2012,55(16):54-57.YIN Qingfeng,WANG Baorui,LIJianyuan,et al.Electrolyte electrolyte electrolysis compound processing technology[J].Aeronautical Manufacturing Technology,2012,55(16):54-57.
[8]NATSU W,KURAHAT A D.Influence of ECM pulse conditions on WC alloy micro-pin fabrication[J].Procedia CIRP,2013,6:401-406.
[9]HEH,ZENG Y,QUN.An investigation into wire electrochemical micro machining of pure tungsten[J].Precision Engineering,2016,45:285-291.
[10]ZHANG C,ZHANG Y,CHENX,et al.Investigation of the electrochemical dissolution behavior of tungs tenduring electrochemical machining[J].International Journal of Advanced Manufacturing Technology,2018,97(9-12):1-8.
[11]QI XX,FANG XL,ZHU D.Investigation of electrochemical micromachining of tungsten mi-crotools[J].International Journal of Refractory Metals and Hard Materials,2018,71:307-314.
[12]黄海清,刘伟,曾令燎,等.微细电火花加工可控式RC脉冲电源研究[J].电加工与模具,2013(2):12-15.HUANG Haiqing,LIU Wei,ZEN GLingliao,et al.Research on controllable RC pulse power supply for micro EDM[J].Electromachining&Mould,2013(2):12-15.
[13]RAJURKARK P,LEVY G,MALSHE A,et al.Micro and nano machining by electro-physical and chemical processes[J].CIRP Annals-Manufacturing Technology,2006,55(2):643-666.