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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