PERMANENT MOLD (GRAVITY CASTING OR LOW PRESSURE CASTING)​

Molds are made of metal and coated with a die release. Molten metal is poured into the mold using gravity or very low pressure to fill the cavity. When solidified, the mold is opened and parts are ejected or removed by hand.

  • Available alloys: aluminum, zinc, copper-base alloys
  • Moderate dimensional accuracy, usually requires machining
  • Good surface finish, tight grain structure, pressure tightness
  • Moderate walls and generous draft required
  • Size range up to 35 lbs., equipment dependent
  • Tooling medium to high, volume and equipment dependent
  • Medium to high volume, equipment dependent
  • Moderate design restrictions, requiring sand or metal cores
CASTING PROCESS DETAIL COMPARISONS
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