Patent ID: 8712750

Claim:
A molten alloy solidification analyzing method of analyzing solidification of molten alloy, comprising: a model setting step of setting a mold model obtained by modeling a mold that forms a cavity, into which the molten alloy is filled, in a coordinate system; and a solidification analyzing step, as executed by a processor, of calculating a solidification process step by step, in which the molten alloy is solidified, based on a fraction solid that is a percentage of solidification of the molten alloy filled into the cavity in the set mold model, wherein the model setting step includes: a model forming step of forming the mold model by associating a form of the mold model with coordinates in the coordinate system; an element creating step of creating a plurality of infinitesimal elements, into which a region in the formed mold model is divided; and an element defining step of defining, among the created infinitesimal elements, the infinitesimal element in a cavity region in the mold model as a cavity element, and the infinitesimal element in a mold region in the mold model as a mold element, and the solidification analyzing step includes a fraction solid change amount calculating step of calculating a fraction solid change amount that is an amount of change in the fraction solid in a filled element that is the cavity element containing the molten alloy, based on a solidification rate that is a time rate of change of an amount of solidification determined by a kind of the alloy and on a solidification rate parameter that is a parameter for evaluating an influence of the solidification rate on solidification of the molten alloy, according to the fraction solid, wherein an appropriate solidification rate parameter is selected according to the fraction solid, and the amount of change in the fraction solid is calculated with the solidification rate parameter applied to the solidification rate.