The consistent and uniform heat distribution in the cast iron permanent mold is of paramount importance for producing castings with fewer defects. To a great extent, the control of most critical factors depends on how the equipment are maintained and also on the cleanliness of the metal baths from which metal is poured into the molds. To address these issues, we felt that we could design an experiment to vary these factors under somewhat controlled experimental condition to study the effects of varying these factors on desired output (porosity rejects). And, if no improvement resulted, we at least could learn more about our process.
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