Centrifugal casting id one of the main type of the permanent mold metal casting. It uses the centrifugal forces to force the metal into the mold cavity. There are two main types of centrifugal casting
- True centrifugal casting
- Semi centrifugal casting
Steps involves in centrifugal casting
Step 1The first step in centrifugal casting is the mold making. Mold of the centrifugal casting is different from other casting processes because its runner and gating system is totally is horizontal direction.
Step 2Mold is attached to the circular disk which will rotate to produce the centrifugal forces. Mold is attach to the central sprue by the mean of the runner. Central sprue is the place where hot molten metal is poured.
Step 3Hot molten metal is poured into the central sprue. When machine start to rotate then metal place in the central sprue start to feel the centrifugal force on it and at some specific force it start to move through the runner into the mold cavity. Centrifugal force is maintain until the metal in the mold solidifies
Step 4When metal solidifies machine is stopped and mold is open to remove the cast part. Now the process can be started again.
Advantages of centrifugal casting
- No high pressure is needed like other permanent mold processes
- Great surface finish
Disadvantages of centrifugal casting
- In some cases air can be trapped in the mold and can create defects in the cast part
- Density of material in the cast part is greater at outer side and lesser at inner side