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온간하이드로포밍시 각형단면 형상 부품의 마찰 영향도 분석
최경호(K. H. Choi),김봉준(B. J. Kim),장정환(J. H. Jang),권승오(S. O. Kwon),문영훈(Y. H. Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
Aluminum has considerable potential as a material for lightweight components. However compared to conventional steel tubes, the forming behavior and limits in hydroforming are reduced. To overcome this disadvantage, it is suitable to apply manufacturing process at elevated temperatures. Tube hydroforming process is characterized by high contact pressure and large contact surfaces, which results in the high friction forces between the tube and the die. Especially in the warm hydro forming process, the formability is significantly affected by the frictional condition. So we studied the frictional effect on the rectangular shape tube when applying reduced model of side rail by warm hydro forming process
횡자속형 2중 공극 영구자석 동기발전기의 마그네트 형상설계
최경호(K.H. Choi),김경식(K.S. Kim),진명철(M.C.Jin),황돈하(D.H. Hwang),배성우(S.W. Bae),김동희(D.H. Kim),노채균(C.G. Ro) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a novel design technique and characteristic analysis of Magnet for dua1 air-gap axial-flux type permanent-magnet synchronous generator. The process of magnet design is applied to the motor design and steady state analysis considering output voltage waveforms and magnetic flux waveforms.<br/> Design and construction of an axial-flux permanent-magnet generator with power output at 60 [Hz], 300 [r/min] is introduced. Finite(FE) method is applied to analyze magnet shape characteristics. The results of FE analysis show generator is feasible for use with dual air-gap axial-flux permanent- magnet synchronous generator.<br/>
최경호(K.H. Choi),김봉준(B.J. Kim),장정환(J.H. Jang),권승오(S.O. kwon),문영훈(Y.H. Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.4
In this study, for the heating of tubes, specially designed induction heating system has been adopted to ensure rapid heating of tubes for warm hydro forming. But the induced heat by the integrated heating system was normally not equally distributed over the length and circumference of the tube specimen, and consequent temperature distribution was non - uniform. So additional heating element has been inserted into the inside of the tube to maintain the forming temperature and reduce temperature drop due to heat loss to the molds. And for that heat loss, a heat insulation system has also been installed. The drop in flow stress at elevated temperatures results in lower internal pressure for hydroforming and lower clamping forces. The proposed warm hydroforming process has been successfully implemented when applying 6061 aluminum extruded tubes.