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자동차 동력전달용 하이포이드 기어의 예비성형체 선정을 위한 해석적 연구
김대원(D. W. Kim),박원규(W. G. Park),최연호(Y. H. Choi),이영선(Y. S. Lee),최호준(H.J.Choi),윤덕재(D.J.Yun),임성주(S.J.Lim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
A hypoid gear is a major component of the transmission of automobiles. The gear is required to have good mechanical properties such as high wear resistance and high strength. Generally, a mechanical machining is applied to make the hypoid gear in order to obtain high shape accuracy. However, a warm forging process should be applied for the manufacture of the hypoid gear to manufacture the gear with better mechanical properties than the machining process. In this study, a warm forging process of the gear is studied to determine the design of perform which can make a hypoid gear with no flash and also minimize the forming load and stresses on the die. By finite element analysis of the process, we can obtain the optimum design of the hypoid gear for the warm forging process.
자기 환원성 TiO<sub>2</sub> 단광의 반응특성에 관한 연구
백상종,신동엽,민주원,최석우,윤덕재,유병돈,Baek, S.J.,Shin, D.Y.,Min, J.W.,Choi, S.O.,Yun, D.J.,You, B.D. 한국소성가공학회 2006 소성가공 : 한국소성가공학회지 Vol.15 No.8
The reduction behavior of $TiO_{2}$ in Al and Al/CaSi containing self-reducing $TiO_{2}$ briquettes(SRTB) was investigated. The maximum yield of Ti was expected with the slag composition of 45-55%CaO in the $CaO-Al_{2}O_{3}$ system. When $CaCO_{3}$ was used as a flux, the oxidation loss of reducing agent by $CO_{2}$ should be compensated, and therefore it leads to excessive requirement of the reducing agent. By using Al and CaSi mixture as a reducing agent of $TiO_{2}$, the reaction products both oxide and metal could be liquefied, and separated effectively with each other. As a result, the yield of Ti increases remarkably. The optimum mixing ratio of CaSi to Al is 78%CaSi-22%Al.