Electrochemical micro-drilling of deep holes by rotational cathode tools

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题名:	Electrochemical micro-drilling of deep holes by rotational cathode tools
作者:	Fan,ZW;Hourng,LW
贡献者:	機械工程學系
关键词:	ULTRASHORT VOLTAGE PULSES;EMM PROCESS;ACCURACY
日期:	2011
上传时间:	2012-03-27 17:06:58 (UTC+8)
出版者:	國立中央大學
摘要:	In numerous non-conventional micro-machining, electrochemical micro-machining has merits such as high removal rate, leaving no residual stress and lower roughness on surfaces of machined products. It has been considered as a highly promising technology in micro-machining. Little research has been done on the deep-hole micro-drilling by electrochemical methods. This work utilizes a rotational system to extract insoluble sludge from a deep hole and reduce the difficulty of filling deep hole with electrolyte. As well as a rotational tool cathode, a pulsed power generator is used to support the intermittence machining to increase the precision of the workpiece. The influence of working parameters, such as pulsed on-times, applied voltages, electrolyte concentrations, pulsed frequencies, tool feeding rates, tool diameters, tool rotational rates, and hole depth, on the hole overcut and conicity in a electrochemical micro-drilling is investigated. A high quality micro-hole with a 33.35-A mu m overcut is drilled by a tungsten carbide pin of diameter 50 A mu m on a 304 stainless steel plate of thickness 1,000 A mu m. The hole aspect ratio (depth/diameter) reaches 8.6. It shows that a rotational tool can be utilized in the deep-hole electrochemical micro-drilling.
關聯:	INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
显示于类别:	[機械工程學系] 期刊論文

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