Vacuum Casting
What is Vacuum Casting?
The process of Vacuum Casting refers to the creation of a geometric object from a silicone mould. It is widely accepted as an alternative to low volume manufacturing. Vacuum Casting is an easy way of creating a replica of the original component.
How to Make Vacuum Casting
In order to produce a replica, there must be a master model. This master model can be 3D printed, created with CNC machines or manufactured using any other method. Creating a master model can take time but Vacuum Casting saves a significant amount of time in the overall manufacturing cycle.
First the master model which is the desired form of the product is situated in a closed environment. Then a semi-liquid moulding material, silicone is placed around it which forms a thick coat. The curing time changes depending on what type of silicone is used. At this point, the mould should not be touched or moved.
Tips for Vacuum Casting:
- Spray the inside of the cavity with “mould release” before pouring the material in to make the removal easier
- Using professional casting materials creates high-quality silicone tools
- Make sure to manufacture a new silicone mould before the previous one begins producing low quality parts (as silicone mould life is around 20 – 30 shots)