AFS Library

RESINS AND SANDS FOR SHELL MOLDING

2347
Journal: Transactions of the American Foundrymen's Society V 61 P 367-377, 1953 (11 p)
Author: Drumm, M F

The proper choice of a sand and the resin binder for shell molding determine to a large extent whether the process will be successful and economic. Most resins perform differently in degree and their utility depends upon their physical properties and the mechanism of the thermosetting reaction. Some are far superior to others. A cheap sand with the desired fineness is not always an economic shell molding sand. The performance of a sand on the automatic machine is dependent greatly upon the particle size distribution and grain shape, but of extreme importance is the condition of the surface of the sand. The choice of molding materials may be guided by proper screening methods and once production has started, control methods must be inaugurated to insure smooth and economic operation.



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