Fig. 7. In this form of shakeout, castings are tumbled out of their sand molds while workers wait at the end to detach the gates, runners and sprues with pneumatic wedges.
Impregnation A treatment of castings with a sealing me-
from stresses set up by steep thermal gradients within the cast- ing during solidification.
dium to stop pressure leaks. Inclusions Particles of slag, refractory materials, sand or deoxidation products trapped in the casting during pour- ing solidification.
remelting or hot working. Injection molding Te injection of molten metal under pres- sure into molds.
Inserts Parts formed from a secondary material and placed in the mold to function as integral structural parts of the casting.
Ingot A mass of metal cast to a convenient size and shape for
Inoculation An addition to molten metal of substances designed to change the physical and mechanical properties of the structure.
Investment casting A pattern casting process in which a wax or thermoplastic pattern is used. Te pattern is invested (surrounded) by a refractory slurry. After the mold is dry, the pattern is melted or burned out and molten metal is poured into the resulting cavity.
Jobbing foundry A metalcasting facility that manufactures cast- ings not intended for use in its own product.
Ladle A container used to transfer molten metal from the furnace to the mold.
Locating pad A projection on a casting that helps maintain alignment of the casting for machining operations.
Locating surface A casting surface to be used as a basis for measurement in making secondary machining operations. Lost foam A casting process in which a foam pattern is
48 METAL CASTING DESIGN & PURCHASING 2014 CASTING SOURCE DIRECTORY
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