Molten alloy solidification analyzing method and solidification analyzing program for performing the same

A molten alloy solidification analyzing system which performs a molten alloy solidification analyzing method, comprising:

• a processor, configured to execute the following:
• 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 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.

A non-transitory computer-readable storage medium comprising computer-executable instructions for performing a molten alloy solidification analyzing method, the method executed by the computer executable instructions 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 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.