AFS Library

MOLDING SANDS, MOLDING METHODS AND CASTING DIMENSIONS

2749
Journal: Transactions of the American Foundrymen's Society V 64 P 398-405, 1956 (8 p)
Author: Heine, R W

New molding processes have received a great deal of attention in the past few years. Shell molding, D-process, pressure molding, C02 -process, and diaphragm molding, to name a few, have been widely heralded as providing a new era of progress in mold ing. Amid the claims and accomplishments of the new methods, it is worthwhile to take a new and critical look at an old process, green sand molding. What are the true capabilities of the process? How well is it now being used relative to its ultimate possibilities? What can be done to get the best results from it? Complete answers to these questions cannot be given for lack of certain fundamental information. However, the general direction of improvements can be discussed. To get the best green-sand casting, the best mold possible must be produced from a combination of molding sand and molding equipment. This mold should have uniform sand density, high hardness, high strength and thermal stability. Inevitably certain characteristics of the sand mixture will affect the ability of the process to obtain such a mold. There fore, consider first the molding sand.



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