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깊은 구멍 가공을 위한 가공액 초음파 가진 미세 방전가공
제성욱(Sung Uk Je),김덕환(Duck Whan Kim),이해성(Hae Sung Lee),주종남(Chong Nam Chu) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.7
Microholes with high aspect ratio are required in microstructures. Among various methods for producing the microhole, micro electrical discharge machining (MEDM) is very effective and useful process. But, it is difficult to machine the high aspect ratio holes below 100 ㎛ in diameter because machining condition becomes unstable due to bad removal of debris at deep hole. In this paper, ultrasonic vibration is applied to MEDM work fluid to make a high aspect ratio micro hole. It is shown that the vibration is effective in circulating the debris and increasing the machining rate. As a result, produced was a micro hole with 92 ㎛ entrance diameter, 81 ㎛ exit diameter and aspect ratio 23.
김민태(MinTae Kim),제성욱(Sung Uk Je),이해성(Hae Sung Lee),주종남(Chong Nam Chu) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.12
In this work, the surface integrity smoothened with a ball end mill was investigated. Because surface integrity mainly affects the manual finishing process, RV<SUB>AM</SUB> (Remaining Volume After Machining) was introduced, and it gives the relation between machining process and finishing process. Runout and phase shift which adversely affect surface integrity were considered in the generation of surface topography. Cutting points in ball end milling were identified with positional vectors and a set of vectors which have the minimum height in unit area was selected for the generation of surface and RV<SUB>AM</SUB> RV<SUB>AM</SUB> variation according to runout and phase shift was calculated and experimentally verified in proposed HSM conditions for mold machining. From the simulations and the experiments, a desirable High Speed Machining condition was suggested.