Vacuum Casting and the Process
There are different types of casting processes used to make parts of metal and polymeric material. Sand casting is one of the oldest and cheapest processes, at a higher-end; there are other processes such as casting and investment castings. The process is simple. Material is poured into a mold and it burns to form the room. The process is not free of gaps. During the casting processes, the air can remain in the material and the mold leading to the formation of blowholes. These are called defects and lead to the rejection of the pieces.
To avoid such defects, another method is used and is vacuum casting. The process is slower but it causes parts free of common casting defects. It is equally useful for the metal only for the casting of polymeric components. Unlike the metal that can be melted again and reused, some polymers, especially thermos or polymers such as polyurethane cannot be reused. The room must be deleted. The empty mold overcomes these problems and helps make perfect parts.
What is the mold flow under a vacuum?
This is usually done with CNC machines or stereo lithography processes. The pattern is polite or given a texture as may be necessary. It is checked for dimensional accuracy. Liquid silicone is applied to the pattern until the desired thickness is reached. The silicone is then cured in a hot room. After he is healed, he is cut along a line of separation. The master pattern is removed. The technicians then place a funnel and close the mold. The actual casting of the polyurethane can take place now.
The vacuum casting process is slightly different. While the traditional sand casting uses bonded sand, only the sand of the United Nations link in a vial placed inside a vacuum chamber and a cast metal once empty is created.