PLASTER MOLD CASTING/PRECISION SAND CASTING

Patterns are made in halves on separate plates (cope and drag) or single plate (match plate) and patterns are placed in a box (flask) and sand with binder is packed around the pattern OR a ceramic slurry is poured over the pattern and allowed to harden. The pattern is removed (plaster molds are oven dried for several hours) and the 2 flasks are placed together and molten metal poured into the cavity created. Internal areas are cored using other types of sand with binders. Process is not usually automated.

Castable aluminum and zinc alloys
Good dimensional accuracy
Excellent surface finish, 125 RMS and better
Requires little or no draft
Medium and short run (good for prototypes)
Low to moderate tooling costs (short lead times)
Very little restrictions to design

CASTING PROCESS DETAIL COMPARISONS

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