True Centrifugal Casting

True Centrifugal Casting Processes

1. Molten metal is poured into the spinning mold cavity and the metal is held against the wall of the mold by centrifugal force. 2. The speed of rotation and metal pouring rate vary with the alloy and size and shape being cast. 3. The inner shape will remain cylindrical because the molten metal is uniformly distributed by centrifugal forces. 4. In true centrifugal casting, without a central core, the metal solidifies from the outside toward the center (axis) of rotation in most cases considering the length to diameter ratio. 5. The true centrifugal casting is spun about its own axis, has no central core, and the cooling takes place from the periphery toward the central axis. 6. In true centrifugal casting, the important consideration is that the cooling takes place in only one direction, from the outside toward the center of rotation. 7. Essentially cylindrical in shape which is produced without a center core and in which the direction of solidification is from the outside of the casting towards the axis of rotation.

Application 1. Can produce to be hollow cylindrical parts, such as pipes, tubes, bushings, and rings.

2. Outside shape of casting can be round, octagonal, hexagonal, etc , but inside shape is (theoretically) perfectly round, due to radially symmetric forces. Advantages 1. The mould surface can be shaped so that pipes with various outer shapes can be made. 2. The mechanical properties are nearly equal in all directions. Disadvantages 1. Since no gates and risers are used, the yield or ratio of casting weight-to-weight of metal is high. 2. The speed of rotation and metal pouring rate vary with the alloy and size and shape being cast.