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민수홍,김옥삼,구본권 ( Soo Hong Min,Ok Sam Kim,Bon Kwan Koo ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.1
N/A The process of solidification of metal is accompanied by liquid-solid change and known as Stefan`s heat conduction problem on the moving boundary. In this study the temperature distribution in ingot and metallic mould during casting was analyzed by the two dimensional heat conduction theory. The transient temperature distribution was numerically calculated using a finite element method on the nodal point of mesh screen representing ingot and mould cross section. The theory was applied on the casting of aluminum(purity ; 99%) in flat ingot mould of GC25. The analysis will make it possible to calculate an optimum mould shape of which temperature gradient becomes minimum.
구본권,류제구,최은순 서울産業大學校 1994 논문집 Vol.40 No.1
This study presents a methodology to predict the hardenability of quenched carbon steel, AISI 1050 steel. The equation of transient heat conduction is analyzed to formulate a cooling curve by a finite element method which incorperates coupled effects of temperature on physical properties, the metallic structures and also the latent heat by phase transformation. The iso-thermal transformation curves of the carbon steel can be constructed by a cubic spline interpolation. The formulated equations of evolution in pearlite and martensite transformations which represented by the iso-thermal transformation curves in nature are employed for structural analysis. The volume fraction of martensite is accomplished structural analysis for hardenability analysis. Consequently, hardness and effective hardening depth are calculated. In other to demonstrate the feasibility of the proposed scheme, experimental tests are undertaken by adopting a full quench and Jominy end quenching model respectively. A favorable agreement is found between analysis and experimental results implying that proposed analytical procedure is reliable.
具本權,金鈺三 서울産業大學校 1990 논문집 Vol.32 No.1
In this study the temperature distribution originated in ingot mould during solidification of ingot in contact was analyzed by the two dimensional heat conduction theory. The transient temperature distribution was numerically calculated using a finite element method on the nodal points of mesh screen representating ingot and mould cross section. It was applied on the casting process aluminum (purity; 99.98%) and flat ingot mould, GC25. The above analysis has made it possible to calculate the thermal stresses of mould and derive an optimum mould shape.
具本權,金鈺三 서울産業大學校 1990 논문집 Vol.32 No.1
In this study thermal stresses originated in ingot mould during solidification of metal were analyzed by the two dimensional thermo elasto-plastic theory. The transient temperature distribution was obtained on the nodal points of mesh screen representation the cross section of ingot an mould. Thermal stresses and temperature distribution were calculated by the finite element method, where the imaginary division of mould as a continum into a finite number of elements in a common procedure and each of them satisfies the compatibility and equilibrium conditions. It was applied in the casting process of pure aluminum in flat ingot mould of GC25. The above analysis has made it possible to obtain an optimum mould shape.