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Theoretical Considerations

From the part designer point of view, the shell thickness is required to be a function of its application. It should depend on the metal to be cast, its density and temperature, the orientation of the mold during pouring, and whether or not support is provided to the mold during pouring.

In theory, the shell thickness will be a function of pattern temperature and investment time.

In their paper Study of the formation of shell sand parts used in the shell molding process (SAMEJ, 1984), Aranguren, Borrajo, and Williams conducted an investigation to produce a process model for the shell molding process. They showed that the shell thickness can be predicted as a function of different operating parameters and binder formulations. This may lead to process optimisation and energy reductions.

Information source: Clegg, Precision Casting Processes.