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Prediction of aspect ratio of a micro hole drilled by EDM
Li Jianzhong,Yin Guoqiang,Wang Cong,Guo Xuejie,Yu Zuyuan 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
Micro electrical discharge machining (EDM) has the ability to drill micro holes with high accuracy in metallic materials. The aspect ratio of a micro hole generated by micro EDM is usually higher than those by other processes such as etching, mechanical drilling, and laser. However, it was found that the drilling speed of micro EDM slows down and even stops when the aspect ratio of a micro hole reaches a certain value. To understand this phenomenon, a theoretical model is proposed based on the fluid mechanics and surface tension. Experiments under different machining conditions are carried out to verify this model. Experimental results agree with the theoretical values, which indicate the validity of the proposed model. The difference between the theoretical values and the real values might be caused by debris, temperature and rotating of electrode in the discharge gap, which are ignored in the model.
Liu, Yi,He, Lin,Yin, Guoqiang,Wu, Guojie,Cui, Yingde Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A convenient Rh-catalyzed C-H arylation of imidazo[1,2-a]pyridines with a variety of aryl halides or triflates has been reported. This process afforded a range of biaryl compounds in excellent yields and showed high activity and broad scope.
Yi Liu,Lin He,Guoqiang Yin,Guojie Wu,Yingde Cui 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A convenient Rh-catalyzed C-H arylation of imidazo[1,2-a]pyridines with a variety of aryl halides or triflates has been reported. This process afforded a range of biaryl compounds in excellent yields and showed high activity and broad scope.