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Variations

The Cold Set Process

The need to apply heat to cure the bond in the shell molding process is time consuming and the hot setting processes are associated with unpleasant fume generation. During the 1950's, organic binder systems that can be cured at room temperature were developed. This development revolutionized production in the sand casting foundry industry.

The processes that were developed, and still being developed, are known by colloquial names such as: air-set, self-set or no-bake; or by trade names which include Alphaset, Betaset, Isocure and Pepset.

Some of these processes are ideal for the production of medium size castings, others are for mass production of cores.

These processes are considered to be precision sand casting processes.

The Colshell Process

As the name suggests, it is a combination of the cold set process and shell molding. Contoured mold are produced from a sand mixture which hardens in contact with the pattern without the application of heat. To achieve an acceptable rate of output, a fast reacting cold set system must be used.

Information Source: Clegg, Precision Casting Processes.