| 摘要 |
PROBLEM TO BE SOLVED: To provide a simulator for casting process and a judging method therefor capable of making an optimum casting plan based on a new evaluation index for casting defects. SOLUTION: An analytical technique for segregation-convection based on a segregation-convection solidification model and an analytical technique for crystal growth based on nucleation-crystal-growth model are simultaneously used every time step. Concentration, speed of flow, temperature, solidus rate, solidification structure, crystal orientation, dendrite arm spacing, and nucleation site are simultaneously output. The existence of casting defects is estimated from the index of casting defects which has been calculated based on them. Not only by the aforementioned casting process simulator, but also from the calculated concentration and temperature by a casting process simulation based on an arbitrary casting plan, the freckle defect evaluation index (Rayleigh Number), in which the segregation and flow of molten metal are considered, and the defect evaluation index for foreign crystal, in which the nucleation mechanism of foreign crystal being considered, are simultaneously evaluated so as to judge the quality of the casting plan.
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