Centrifugal Casting

Centrifugal casting process is used to produce castings that are cylindrical in shape. In Centrigugal casting, as permanend moldis rotated about its axis at high speeds as the molten metal is poured. The molten metal is centrifugally thrown towards the inside mold wall, where it solidifies. The casting is usually a fine grain casting with a very fine-grained outer diameter, which is resistant to atmospheric corrosion, a typical need with pipes. The inside diameter has more impurities and inclusions, which can be machined away.
Centrifugal casting has three primary metallurgical benefits:

Centrifugal castings are produced in either a vertical or horizontal casting orientation :-

Vertical Centrifugal Casting is is more suitable for cylinders with a ring geometry (diameter-to- length ratio [aspect ratio] >1). Vertical machines are often mounted in a concrete pit below ground.

Horizontal Centrifugal Casting is more suitable for tube geometries (diameter-to-length ratio [aspect ratio] <1). The horizontal machines are commonly mounted at floor level.

 In this method, the mold is rotated at high speed so that the molten metal is distributed by the centrifugal force to the outer regions of the die cavity

– includes : true centrifugal casting, semicentrifugal casting.

True Centrifugal castings:

– Molten metal is poured into a rotating mold to produce a tubular part (pipes, tubes, bushings, and rings)

 

– Molten metal is poured into a horizontal rotating mold at one end. The high-speed rotation results in centrifugal forces that cause the metal to take the shape of the mold cavity. The outside shape of the casting can be non-round, but inside shape of the casting is perfectly round, due to the radial symmetry w.r.t. Forces.

 

Semi Centrifugal castings:

In this process, centrifugal force is used to produce non-tubular parts (solid),and not tubular parts. GF will be around 15 by controlling the rotation speed.Molds are provided with riser at the center.Generally the density of metal will be more at the outer sections and not at the center of rotation. So parts in which the center region (less denser region) can be removed by machining (like wheels, pulleys) are usually produced with this method.

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