http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
SAE1144강의 기계적특성에 미치는 가공열처리의 영향
오상균(S. K. Oh),서창희(C. H. Suh),김동배(D. B. Kim),정윤철(Y-C. Jung),김영석(Y. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Drawing and normalizing are efficient means for controlling strength, fatigue and machinability of free machining steel. Normally strength and machinability are conflicting properties which need to be optimized. In this study, the effects of normalizing temperature and reduction of area on strength, fatigue and machinability were investigated. Fine grains were generated at lower normalizing temperature and fatigue life was increased with decreasing grain size. Matrix was work hardened and elongated with increasing reduction of area. Inclusions also were elongated and cross-sectional area of inclusions along drawing axis was decreased. The effects of work hardening and grain size on fatigue life were significant, but only work hardening affected machinability. Shape and distribution of inclusions after drawing had little effect on fatigue life and machinability.
자동차 변속기용 록업클러치 피스톤의 핫프레스포밍 최적설계
오상균(S. K. Oh),서창희(C. H. Suh),권태하(T. H. Kwan),강해동(H. D. Kang),임형철(H. C. Lim),백승원(S-W. Baek),김영석(Y. S. Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This study was carried out to optimize the design of HPF(Hot press forming) process for a lock-up clutch piston of a automatic transmission. The lock-up piston which is a component of the torque converter must have properties such as the high strength and resistibility about the deformation because high oil pressure is repeatedly applied. Therefore the lock-up piston is must manufactured through the HPF to get the high strength also to reduce the spring back. In this study, FE analysis and experiments were conducted to propose the optimum design for the HPF process. In result of the simulation, the distributions of the temperature, stress, strain and spring back were predicted during the HPF process. Also the optimum condition for the HPF is proposed by the correlation between parameters such as the pressure, temperature, dwell time of the die and results of experiments.