Abstract: Based on the direct finite difference, a 3-dimensional numerical simulation model for quickly calculating the solidification time of casting to get the distributing rule of hot sport has been developed by casting modulus method and heat transfer method. Because the process ability of casting structure can be evaluated by these numerical results, this model can be used as a tool for the product designer to check casting structure from casting process view, and for foundry engineers to design feeding systems as well. It is demonstrated that the model is useful to improve developing casting process by applying it to the practical aeronautic castings.

Key words: finit e difference, solidification time, casting modulus, heat tr ansfer calculation, pr ocess abilit y ofcasting str uct ur e