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조인성,홍준표 ( In Sung Cho,Chun Pyo Hong ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.2
N/A Solidification of aluminum alloys under moderate pressures has been investigated. Interfacial heat transfer coefficient at the casting/mold interface varies with time after pouring the molten metal into the die cavity, and therefore plays an important role in determining solidification sequence. The heat transfer coefficients were evaluated by using an inverse problem method, based on the measured temperature distribution. The calculated heat transfer coefficients were used for solidification simulation in the squeeze casting process. The effects of applied pressure and positions of insulation in the mold have also been investigated on solidification microstructures and on the formation of macrosegregation of Al-4.5wt.%Cu alloys.
조인성,홍준표,이호인 ( In Sung Cho,Chun Pyo Hong,Ho In Lee ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.6
N/A A stochastic model, based on the coupling of the finite volume(FV) method for macroscopic heat flow calculation and a two-dimensional cellular automaton(CA) model for treating microstructural evolution was applied-for the prediction of microstructural evolution in squeeze casting. The interfacial heat transfer coefficient at the casting/die interface was evaluated as a function of time using an inverse problem method in order to provide a quantitative simulation of solidification sequences under high pressure. The effects of casting process variables on the formation of solidification grain structures and on the columnar to equiaxed transition of an Al-4.5wt%Cu alloy in squeeze casting were investigated. The calculated solidification grain structures were in good agreement with those obtained experimentally.
SOLA-VOF 법에 의한 정밀 주형내 용탕흐름의 수치 모델링
조인성,홍준표 ( In Sung Cho,Chun Pyo Hong ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.5
N/A A numerical model based on the SOLA-VOF method, which can calculate the transient free-surface configuration of the melt, has been developed in order to analyze melt flow in the investment mold. The computational results were compared with experimental results obtained from pure aluminum investment casting. Heat transfer analysis, with and without consideration of melt flow effect has been performed. It can be concluded that analysis of melt flow in the investment mold, provides the optimum conditions for gating design. It also enables more precise solidification simulation, since heat loss, while filling the thin and complex investment mold, plays an important role in determining the solidification sequence.
용탕충진과정에 있어서 열 및 유동을 포함한 2차원 응고해석
김성빈,조인성,김진수,홍준표 ( Sung Bin Kim,In Sung Cho,Jin Su Kim,Chun Pyo Hong ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.5
N/A A Numerical technique has been developed for the coupled heat transfer and fluid flow calculation during the casting process. In this method the SMAC technique was coupled with the concept of Volume of Fluid(VOF) to calculate melt free surface and velocity profiles within the melt, and the Energy Marker method coupled with the finite difference method was proposed for the convective and conductive heat transfer analysis in the casting. When comparing numerical calculations with experimental observations, a close correlation was evident. It has been shown that this technique is useful for proper gating and casting design, especially for thin-walled castings.
용탕단조시 Al-7wt. % Si 합금의 거시편석과 거시조직 형성에 대한 제조변수의 영향
조인성,백승엽,홍준표 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.1
Formation of macrosegregation in squeeze casting of an Al-7wt%Si alloy was investigated with regard to microstructural evolution under various process variables. The effects on the macrosegregation area of the process variables, such as applied pressure, pouring temperature, die temperature, delay time before pressurization, and height/diameter ratio of the casting were investigated. As the applied pressure increased, the macrosegregation area increased while the length of columnar grains decreased. However, as the die and the pouring temperatures increased, both the macrosegregation area and the length of columnar grains increased. The increase in the delay time for pressurization after pouring also resulted in the increase both of the length of columnar grains and the macrosegregation area. It was found that the macrosegregation area decreases with increasing the amount of equiaxed grains in castings.
박영필,민병렬,문영현,김상식,조원철,홍준표,이홍림,김재희,오두환 연세대학교 산업기술연구소 1988 논문집 Vol.20 No.2
In accordance with the rapid advance of computer technologies, industries as well as the academic world become to apply the computer to various fields in engineering. Therefore, more realistic and effective computer educations should be provided in engineering colleges. This study proposes some schemes to elevate currently offered computer- related educations in engineering colleges. For this study, 10 major domestic and foreign engineering colleges were surveyed in the aspects of computer- related courses and computer systems offered by the colleges.