Electrochemical micro-drilling of deep holes by rotational cathode tools

被引:48
作者
Fan, Zhi-Wen [1 ]
Hourng, Lih-Wu [1 ]
机构
[1] Natl Cent Univ, Dept Mech Engn, Chungli 32054, Taiwan
关键词
Electrochemical machining; Electrochemical drilling; Pulsed voltage; High aspect ratio hole; Rotational electrode tool; ULTRASHORT VOLTAGE PULSES; EMM PROCESS; ACCURACY;
D O I
10.1007/s00170-010-2744-x
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
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.
引用
收藏
页码:555 / 563
页数:9
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