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금속 와이어의 무구속 열간 인발 특성 -스테인레스강 와이어와 구리 와이어-
하보근,김종성,백영남,허유,Ha, Bo-Keun,Kim, Jong-Seong,Paik, Young-Nam,Huh, You 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.5
Micro-sized metal fibers are suitable for multi-functional and high performance industrial components, but the fiber manufacturing process relies heavily on wire drawing with dies, which can cause die-raw material friction. An alternative for the efficient production of the metal fibers is to use dieless wire drawing technology. This paper reports the characteristic differences of the dieless wire drawing process, which relies on forced necking. The hot working principle was applied to the most frequently used raw materials, stainless steel and copper, while a microwave furnace and susceptor were employed. The experimental trials showed that stainless steel wires could be more advantageous in dieless drawing than copper wires in that the necking of the stainless steel wire took place in a narrower zone than copper. Furthermore, a mathematical model was set up considering volume heating and wire cooling and combining the temperature effect of viscosity in Arrhenius form with the plastic deformation in Bingham form. The model showed good agreement with the experiments when the process was carried out in a steady state at various draw ratios and process speeds. These results suggest that the theoretical model can depict the real process quite well.
벌크시멘트화차의 대차 하중시험과 진동성능시험 및 동특성 해석 연구
홍재성(Jai-Sung Hong),함영삼(Young-Sam Ham),백영남(Young-Nam Paik) 한국철도학회 2003 철도저널 Vol.6 No.3
The object of this study is to ensure the stability of bulk cement cars conducting vibration performance test, dynamic characteristic analysis and static load test of bogie frame. In case of static load test, bogie static load test facility was used. In case of dynamic characteristic analysis, Vampire Software was used. In case of vibration performance test, real bulk cement cars were used in kyeung-bu line. In the results of static load test of bogie frame for bulk cement car, all structures satisfied allowable stress criteria of materials. The vibration performance test and dynamic characteristic analysis results satisfied allowable standards.
비틀림 흡수구조형 제륜자 홀더행거의 적용방안에 관한 연구
홍재성(Hong Jai-Sung),함영삼(Ham Young-Sam),백영남(Paik Young-Nam) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Among welded structure bogies in use for high speed freight car, a part of bogies manufactured in 1999 and 2000 have found problems that crack occurs in its end beam. In case of a freight car the difference of weight between empty and loading conditions are worse than in case of a passenger car. Moreover its brake system is tread brake without second suspension system. Cracks of end beam is supposed to be due to loading by brake system rather than vertical loading by freight. These cracks can make brake system useless and may be a cause of derailment in the worst case. In this study, we have proposed a simple torsion-free brake shoe holder hanger to remove torsion of hanger bracket which was supposed to be one of causes of cracks and performed finite element analyses. Also static load test was applied in torsion free brake shoe holder.