AFS Library


Journal: AFS Transactions (1969) p. 141-145, MODERN CASTING (August 1969) p. 141-145
Author: R. E. Schroeder and W. S. Hackett

Microwaves are very short electromagnetic waves that fall in the same general classification of high frequency radiation used in radio, television, and radar. Microwaves lie between radio frequencies and infrared rays. In the microwave core process the energy is transferred directly to the core and heat generated within the core by molecular friction. The microwave energy heats the entire core from surface to center at the same time, without having to heat ambient air, oven walls, or conveyors. The rate of heating the cores is dependent upon the frequency of the microwave field and the permittivity and loss properties of the material being heated. Microwave during and drying of cores is accomplished in about 1/10 the time required for conventional methods. Smaller ovens are required, using less space. Fewer core driers are needed; 100 will do the work of 1,000. There is less heat and smoke from the core room. Other advantages anticipated are: Improved core dimensions, Reduced labor and Equipment costs.

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