processingdetails

Vacuum Casting

Vacuum casting, also can be referred as the casting or vacuum molding, is the process by which a vented mold is used. The molten metal flows into the mold by atmospheric pressure, then a vacuum is applied to remove trapped air.  This process is used when air entrapment is a problem, there are intricate details or undercuts, or if the material is fiber or wire reinforced. And the main disadvantage to this process is the high price for the equipment.

The process starts by placing a two piece silicone mold in a vacuum chamber. The raw material is mixed and degassed and then poured into the mold. The vacuum is then released and the mold removed from the chamber. Finally, the casting is cured in an oven and the mold removed to release the completed casting. The silicone mold can be reused.