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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Micro electrical discharge machining of small hole in TC4 alloy
LI Mao-sheng(李茂盛)1, 2, CHI Guan-xin(迟关心)2, WANG Zhen-long(王振龙)1, 2,
WANG Yu-kui(王玉魁)2, DAI Li(戴 立)1, 2

1. Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China;
2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Aiming at machining deeply small holes in TC4 alloy, a series of experiments were carried out on a self-developed multi-axis micro electrical discharge machining (micro-EDM) machine tool. To improve machining efficiency and decrease relative wear of electrode in machining deeply small hole in TC4 alloy, many factors in micro-EDM, such as polarity, electrical parameters and supplying ways of working fluid were studied. Experimental results show that positive polarity machining is far superior to negative polarity machining; it is more optimal when open-circuit voltage, pulse width and pulse interval are 130 V, 5 μs and 15 μs respectively on the self developed multi-axis micro-EDM machine tool; when flushing method is applied in micro-EDM, the machining efficiency is higher and relative wear of electrode is smaller.

 

Key words: TC4 alloy; micro electrical discharge machining; deeply small hole; multi-axis micro-EDM machine tool

ISSN 1672-7029
CN 43-1423/U

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