True centrifugal casting is used for pipe, liners, and symmetrical hollow body. They are cast by rotating the mould about its axis horizontally or vertically (Figure 20.22). The metal is held against the wall of the mould by centrifugal force and no core is used to form a cylindrical cavity inside the casting. The wall thickness of the pipe produced is controlled by the amount of metal poured into the mould.
Figure 20.22 Centrifugal Casting
Advantages
- This process produces clean casting since all foreign matter collected on the surface of the central hole can be easily removed by machining.
- Dense metal component is produced due to centrifugal force.
- There is no need to use central core, riser, and runner.
- It can be used for large production.
Disadvantages
- Equipment cost is high.
- True centrifugal casting is limited to certain shapes only.
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