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As the name implies, the essential features of the centrifugal casting process consist of sub- jecting molten metal to centrifugal pressure created in a rapidly rotating mold in such a manner that the metal is directed to assume the shape of the mold.
Over the past several years, centrifugal castings have been perfected by casting into refractory molds to give diameters up to 120 in and weighing 10,000 lb.
Two distinct forms of centrifugal casting machines are employed, one with the axis of rotation oriented horizontally, the other being vertical (Fig. 12.1).
The shaped outer diameter on a centrifugal casting can save considerable amount of time during machining and grinding.
In general, a metal die centrifugal casting meets ASTM E446 Class I radiography criteria, and a refractory shape centrifugal casting falls in Class II, but in many circumstances the latter can qualify to be in Class I.
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