Vacuum casting is a?process used in manufacturing to produce high-quality,?low-volume plastic parts.?The process involves making a silicone mold of a master pattern, then using the mold to cast resin parts under a vacuum.
Step-by-step process of vacuum casting:
- Creation of Master Pattern:?A master pattern is made using a 3D printer, CNC machine, or other prototyping methods.
- Making a Silicone Mold:?A silicone mold is made by pouring liquid silicone rubber around the master pattern and allowing it to cure.
- De-molding the Master Pattern:?Once the silicone has cured, the master pattern is removed, leaving a cavity in the shape of the desired part.
- Mixing Resin:?The liquid Resin is measured and mixed according to the manufacturer's instructions.
- Pouring Resin into the Mold:?The Resin is poured into the silicone mold and spread evenly to ensure a consistent thickness.
- Applying Vacuum:?The mold is then placed into a vacuum chamber to remove any air bubbles from the Resin. A vacuum is applied to the mold to draw out any trapped air and to ensure a uniform fill of the mold cavity.
- Curing the Resin:?The Resin is allowed to cure for the required time, depending on the specific Resin being used.
- De-molding the Part:?Once the Resin has fully cured, the mold is opened, and the cast part is removed.
- Finishing:?Finally, any necessary post-processing, such as trimming, sanding, or painting, is done to finish the cast part.
Vacuum casting is a versatile process that can produce high-quality, accurate parts with a smooth surface finish in a relatively short amount of time, making it a popular choice for prototyping and short-run production.
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