| The quality of large-scale forging connects with the quality of ingot closely. It is necessary to control the solidification process to obtain the high quality ingot. In this paper, a general purpose commercial finite element method software ANSYS is used for simulation of the three dimension temperature and thermal stress field of ingot mould and steel ingot in solidification process.The mathematical models of transient state temperature field and elastic-plastic stress field are established using suitable simulation hypotheses and considering the changing material property with temperature. The temperature and thermal stress distribution in 13 ton ingot and mould in solidification process are calculated and analyzed. According to the result, optimum design on the original 13 ton ingot mould is obtained by increasing taper and decreasing the ratio of height and diameter. At the same time, the numerical calculation of ingot mould with different riser proportion is carried out. The result validates that the selection of riser proportion will effect on the quality of steel ingot without other design parameter changed. Therefore, both quality of steel ingot and yield are considered synthetically.Moreover, the effect using different wall thickness of ingot mould is compared and analyzed, the result shows that increasing the wall thickness of metal mould can improve the cooling speed of steel ingot. The effect on solidification speed will gradually weaken after increasing the wall thickness is up to a limit. The thermal stress will increase as improving the wall thickness. So the wall thickness of metal mould is neither thin nor thick.The numerical simulation of solidification process is studying emphasis and inevitable trend in the lab of solidification field. This method is applied to analyzing the change of temperatureand stress in ingot and mould and it provides basis for the optimum design of ingot mould. The study has certain reference standard for practical manufacture.
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