Processing factors of controllable die-sinking ablation processing on Ti-6Al-4V

被引:14
作者
Kong, Linglei [1 ]
Liu, Zhidong [1 ]
Qiu, Mingbo [1 ]
Han, Yunxiao [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, Nanjing 210016, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Ti-6Al-4V; Electrical discharge machining; Die-sinking ablation processing; Processing factors; Type-hole machining; TITANIUM-ALLOYS; EDM;
D O I
10.1016/j.jmapro.2019.02.021
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To achieve a controllable and stable ablation process of Ti-6AL-4V that avoids the explosion induced by the violent oxidation combustion reaction that occurs between Ti-6Al-4V and the pure oxygen medium, a mixed medium composed of oxygen and argon is proposed as the discharge medium for the Ti-6Al-4V Die-sinking ablation processing. Oxygen concentration, gas pressure and discharge energy are the research objects of this study. These factors affect the high efficiency ablation process and the explosion of the Ti-6Al-4V, and we analyzed them by establishing a diffusion model of oxygen to matrix material in the ablation process, the discharge heat source model and the theoretical derivation. We then proved this theory by experiment. Experimental results indicated that the proper reduction of oxygen concentration, gas pressure, and discharge energy can achieve a stable high-efficiency ablation process for the Ti-6Al-4V and avoid the occurrence of the explosive phenomenon. The argon medium slows the oxygen diffusion velocity, improving the discharge status and reducing the micro-crack width of the recast layer. At the same experimental conditions, the machining efficiency is nearly 9 times than that of the EDM with air medium and the ablation process type-hole depth was three times that of EDM in water.
引用
收藏
页码:338 / 345
页数:8
相关论文
共 24 条
[1]   Monopulse electrical discharge machining ablation drilling technology for Ti-6Al-4V titanium alloy [J].
Cao, Zhongli ;
Liu, Zhidong ;
Wang, Xiangzhi ;
Qiu, Mingbo ;
Hui, Zhiguang .
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2016, 86 (1-4) :539-546
[2]  
Davies HJ, 1971, MODERN FLUID DYNAMIC, P243
[3]   Titanium alloys and their machinability - A review [J].
Ezugwu, EO ;
Wang, ZM .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 1997, 68 (03) :262-274
[4]  
Frank-Kamenetskii DA, 1983, DIFFUSION HEAT TRANS, P10
[5]  
Govindan P., 2012, J. Manuf. Processes, V14, P277
[6]  
Inoue K, 1983, ELECT DISCHARGE MACH, P10
[7]   Optimization of the EDM parameters on machining Ti-6Al-4V with multiple quality characteristics [J].
Kao, J. Y. ;
Tsao, C. C. ;
Wang, S. S. ;
Hsu, C. Y. .
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2010, 47 (1-4) :395-402
[8]   Electrical discharge machining in gas [J].
Kunieda, M ;
Yoshida, M ;
Taniguchi, N .
CIRP ANNALS 1997 MANUFACTURING TECHNOLOGY, VOLUME 46/1/1997: ANNALS OF THE INTERNATIONAL INSTITUTION FOR PRODUCTION ENGINEERING RESEARCH, 1997, 46 :143-146
[9]  
Liang GF, 1975, HIGH SPEED OXYGEN CU, P15
[10]   Study of dry EDM with oxygen-mixed and cryogenic cooling approaches [J].
Liqing, L. ;
Yingjie, S. .
PROCEEDINGS OF THE SEVENTEENTH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM), 2013, 6 :344-350