Research on Titanium Alloy TC4 Electrical-discharge Machining Characteristics Using Oil-in-water Emulsion

Abstract

Abstract:

To solve the problems for TC4 EDM, such as lower machining efficiency in kerosene and bad surface quality in distilled water, the kerosene and emulsifier were added into distilled water and vibrated by ultrasound to form oil-in-water emulsion herein. To study the characteristics of three kind of dielectrics used in TC4 EDM, kerosene, oil-in-water emulsion and distilled water were used as working dielectrics to machine titanium alloy, they were compared in aspects of MRR, electrode wearing rate (EWR) and surface quality. Results show that: two times higher machining efficiency in oil-in-water emulsion can be obtained than in kerosene and the surface roughness is decreased 15%~20% than in distilled water. After machining in oil-in-water emulsion, there are less surface microcracks on the workpiece, and its surface smoothness is better than the others machined in kerosene and distilled water, but the EWR is higher.

Key words: oil-in-water emulsion, titanium alloy, electrical-discharge machining(EDM), material removal rate (MRR)

摘要：

为解决钛合金在煤油介质中电火花加工效率低及在蒸馏水介质中加工表面质量差的问题,提出利用乳化剂将煤油和蒸馏水超声振动后形成水包油型乳化液作为工作介质的加工方法。分别以煤油、水包油型乳化液和蒸馏水为工作介质,对钛合金TC4进行放电加工试验,从加工效率、电极相对损耗率和表面质量三个方面,对比研究了不同工作介质中钛合金电火花加工的特性。试验结果表明：水包油型乳化液中的加工效率是煤油中加工效率的两倍左右,工件表面粗糙度值Ra比蒸馏水中的Ra值减小了15%~20%,加工后工件表面微裂纹较少,表面较平整,但其电极相对损耗率高。

关键词: 水包油型乳化液, 钛合金, 电火花加工, 加工效率

CLC Number:

TG662

Xue Rongyuan, Liu Zhidong, Wang Xiangzhi, Qiu Mingbo, Tian Zongjun. Research on Titanium Alloy TC4 Electrical-discharge Machining Characteristics Using Oil-in-water Emulsion[J]. China Mechanical Engineering, 2014, 25(9): 1164-1168.

薛荣媛, 刘志东, 王祥志, 邱明波, 田宗军. 水包油型乳化液钛合金TC4电火花加工特性研究[J]. 中国机械工程, 2014, 25(9): 1164-1168.

References

[1]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.
[2]Chen S, Yan B, Huang F. Influence of Kerosene and Distilled Water as Dielectrics on the Electric Discharge Machining Characteristics of Ti-6A1-4V[J].Journal of Materials Processing Technology, 1999, 87(1):107-111.
[3]倪青. 蒸馏水介质中钛合金的电火花加工[J]. 湖北航天科技, 2007(2):34-37.
Ni Qing. Electrical Discharge Machining of Titanium Alloy in Distilled Water[J].Hubei Aerospace Science and Technology, 2007(2): 34-37.
[4]波林，普劳斯尼茨，奥康奈尔. 气液物性估算手册[M]. 赵红玲，王凤坤，陈圣坤,等，译. 北京: 化学工业出版社,2006.
[5]郑铸, 迟恩田. 钛合金水中电火花加工的研究[J]．航空制造技术, 1986(4):31-36. Zheng Zhu, Chi Entian. Study on Electric Discharge Machining of Titanium Alloy in Water[J]. Aeronautical Manufacturing Technology, 1989(4): 31-36.
[6]李明辉. 电火花加工理论基础[M]. 北京: 国防工业出版社,1989.
[7]陈文安, 刘志东, 王祥志, 等.钛合金TC4放电加工电极损耗研究[J]. 机械制造与自动化, 2012, 41(4):163-166.
Chen Wen’an, Liu Zhidong, Wang Xiangzhi, et al．Research on Tool Wear of Titanium Alloy(TC4) by EDM[J]．Machine Building & Automation, 2012, 41(4): 163-166.
[8]萧至君. 不同加工液(煤油, 蒸馏水, 混合液)对钛合金(Ti-6Al-4V)放电加工特性之影响[D]. 台北: 中央大学, 2000.
[9]魏引焕, 张晓燕. 电火花加工中干扰因素对加工质量的影响[J]. 陕西科技大学学报, 2005, 23(6): 96-100.
Wei Yinhuan, Zhang Xiaoyan. The Analyses of Factors Which Influence the Quality in Electrosparking[J]. Journal of Shaanxi University of Science & Technology, 2005, 23(6): 96-100.
[10]王怀志, 刘志东, 田宗军, 等. 钛合金TC4不同介质放电加工蚀除机理研究[J]．电加工与模具, 2012(1):24-28.
Wang Huaizhi, Liu Zhidong, Tian Zongjun, et al. Material Removal Mechanism of the Ti-6Al-4V EDM with Different Dielectrics[J]. Electromachining & Mould, 2012(1): 24-28.

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