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개량차분법에 의한 주강품 및 대형 잉곳드의 응고해석과 수축공 예측
이영철,김종원,홍준표 ( Young Chul Lee,Jong Won Kim,Chun Pyo Hong ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.1
N/A Solidification analysis was conducted on large steel castings and ingots by a modified finite difference method. Auto-mesh generation system was developed for improving the application of the computer analysis system to casting design. Combined use of the prediction parameters, solidification time and temperature gradient, and an auxiliary parameter, shrinkage potential, were used to predict the formation of shrinkage defects. Several examples on the prediction of shrinkage cavity by this method were compared with the experimental results. It was found that a quantitative design of large steel castings and ingots can be made by the computer aided analysis of solidification process.
반복 금형주조용 자동 금형냉각장치 개발 및 적용 1 : 용탕충진거동 및 응고해석
이영철,이상목,최정길,홍준표 ( Young Chul Lee,Sang Mok Lee,Jeong Kil Choi,Chun Pyo Hong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.2
N/A A three dimensional simulation program based on the SOLA-VOF technique was developed for the modeling of mold filling and solidification sequences of the AC4B alloy in the cyclic permanent mold casting process. The geometries and mesh diagrams of the casting and the mold were automatically generated using a pre-processor based on the commercial Auto-CAD system. The solidification time of the casting and the temperature variation of the mold with cyclic casting were evaluated using the present scheme. The effects of the local water cooling of the metal mold on the cyclic casting process were also examined in order to control the temperature variation in the mold and to improve the soundness of the castings. The minimization of the casting cycle time was also confirmed by the present program for an improved productivity. It can be concluded that the present program can be used for obtaining the optimum casting parameters and the local cooling condition for obtaining sound castings without shrinkage defects in the cyclic mold casting process. (Received March 2, 1998)
반복 금형주조용 자동 금형냉각장치 개발 및 적용 2 : 실험적 검증
이상목,이영철,최정길,홍준표 ( Sang Mok Lee,Young Chul Lee,Jeong Kil Choi,Chun Pyo Hong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.2
N/A The effects of water cooling channels in the metal mold on the cyclic casting process were examined experimentally in order to control the temperature variation in the mold and to improve the soundness of castings. An automatic control system for the water cooling channels was developed based on the computer simulation. Optimum cooling water can be supplied to maintain a quasi-steady state of the mold temperature during the cyclic casting process, leading to the prevention of hot spots and resultant casting defects. Various water cooling conditions were examined for obtaining better quality castings and reduced casting cycle time, and the results were compared with the computational results which was reported in paper I. It was found that the calculated results were in good agreement with those obtained experimentally. Microstructure and hardness variations were also investigated as a function of the distance from the casting center line. (Received March 2, 1998)
이영철,이두호,김종기,소찬영,최정길,홍준표 ( Young Chul Lee,Doo Ho Lee,Jong Ki Kim,Chan Young So,Jeong Kil Choi,Chun Pyo Hong ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.5
N/A An integrated computer program consisting of a pre-processor, main solver, and post-processor was developed for the design of large steel castings. The pre-processor, based on the AutoCAD, enables the user to produce approval drawings, casting design drawings and mesh diagrams in sequence using a personal computer. In the main solver, two numerical models were employed; one models the fluid flow during mold filling, and the other models the heat transfer and solidification. The post-processor can be used to present simulation results such as flow pattern, mold filling sequences, solidification times, temperature gradients and location of shrinkage defects by color graphics. In order to validate the applicability of the present integrated program, a series of experiments on simple-shaped steel castings were carried out. After the validation of the present model, it was applied to the casting design of the large steel anchor of an SC42 alloy. Various solidification parameters such as a temperature distribution and a solidification time in the casting and the mold were compared with those obtained experimentally. Simulated results predicting shrinkage defects were in good agreement with those obtained experimentally. It was found that the present method can be successfully applied to the quantitative casting design for complex-shaped large steel castings. (Received June 4, 1997)