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손성우(S. W. Son),김일수(I. S. Kim),정재원(J. W. Jung),김지선(J. S. Kim),나현호(H. H. Na) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
The weld-bead geometry in stainless steel produced by GTAW(Gas Tungsten Arc Welding) plays an important role in determining the mechanical properties of the weld and its quality. However, due to various welding parameter of GTAW(Gas Tungsten Arc Welding) process, it was difficult that optimum welding condition conclusion satisfied welding quality. In this paper we describe an experimental method for optimum welding properties using Genetic algorithm. Genetic algorithm was applied to decide optimum welding parameters. Genetic algorithm was created random welding condition and selected probability concept for optimization of welding condition.
미세 방전 가공에서의 방전 펄스 카운팅을 이용한 간극 제어
정재원(J. W. Jung),고석훈(S. H. Ko),정영훈(Y. H. Jeong),민병권(B. -K. Min),이상조(S. J. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The electrode wear in micro-EDM significantly deteriorates the machining accuracy. In this regard, electrode wear needs to be compensated in-process to improve the product quality. Therefore, there are substantial amount of research about electrode wear. In this study a control method for micro-EDM using discharge pulse counting is proposed. The method is based on the assumption that the removed workpiece volume is proportional to the number of discharge pulses, which is verified from experimental results analyzing geometrically machined volume according to various number of discharges. Especially, the method has an advantage that electrode wear does not need to be concerned. The proposed method is implemented to an actual micro-EDM system using high speed data acquisition board, simple counting algorithm with 3 axis motion system. As a result, it is demonstrated that the volume of hole machined by EDM drilling can be accurately estimated using the number of discharge pulses. In EDM milling process a micro groove without depth variation caused by electrode wear could be machined using the developed control method. Consequently, it is shown that machining accuracy in drilling and milling processes can be improved by using process control based on the number of discharge pulses.