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RISS 인기검색어
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- 저자 : 홍준표 ( Jin Soo Kim (검색결과 2 건)
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김진수,안재영,한요섭,이호인,홍준표 ( Jin Soo Kim,Jae Young Ahn,Yo Sub Han,Ho In Lee,Chun Pyo Hong ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.3
N/A Research in heat transfer and solidification commonly involves experimentation and mathematical modeling with associated numerical analysis and computation. Inverse problems in heat transfer are part of this paradigm. During the solidification of metal casting, an interfacial heat transfer resistance exists at the boundary between the casting and the mold, and this heat transfer resistance usually varies with time. In the case of the squeeze casting the contact heat transfer resistance is decreased by pressure and ideal contact is almost accomplished. In the present work, heat transfer coefficient, which is inverse value of the heat transfer resistance, was used for convenience. A numerical technique, Non-Linear Estimation has been adopted for calculation of the casting/mold interfacial heat transfer coefficient during the squeeze casting process. In this method, the measured temperature data from experiment were used. The computational results were applied to the analysis of heat transfer and solidification.
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김지준,김진수,류관호,최정길,이진형,홍준표 ( Ji Joon Kim,Jin Soo Kim,Gwan Ho Ryu,Jeong Kil Choi,Zin Hyoung Lee,Chun Pyo Hong ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.3
N/A In gravity die casting, die cooling systems are frequently employed with water cooling to remove the heat of the solidifying metal. Thermal modeling is an important technique in mold design for improving the productivity of the process. Computer simulation system which consists of pre-processor, main solidification simulator and post-processor has been developed for three dimensional solidification analysis of cyclic gravity die casting. The pre-processor is used for mesh generation in a PC system. The modified finite difference method is adopted for the main solidification simulation algorithm during all the casting cycles. The post-processor graphically presents the simulation results. Several experiments in automotive cast piston were carried out. The temperature variations in casting and mold with time are measured experimentally, and the results are compared with calculation results. The effects of cycle number on solidification pattern are also studied. Several experimental results for the prediction of shrinkage defects are compared with calculated results.
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