molds for centrifugal casting should be maintained in the operating range

Pouring Speed‐This is governed primarily by  the  characteristics of the par‐ticular metal  being  poured and the need to finish the  delivery  of the molten metal before the metal  becomes  sluggish, although too high a rate of  pour  can cause excessive turbulence as well  as  "raining" and a potentially scrapped  casting.  In practice, slow pouring offers a  number  of advantages. Directional  solidification  and feeding are promoted while  the  slow devel‐opment of full centrifugal  pressure  on the outer solidified skin of metal  reduces  the risk of hot tearing. centrifugal casting machine

• Mold Temperature‐As a general  recommendation,  molds for centrifugal casting  should  be maintained in the operating range of  500 ‐550F (260‐288C). Preheating of the mold  to  this approximate temperature range will also  facilitate  the application of the refractory mold  coating.  The principal significance of  maintaining  the mold (die) at a uniform  operating  tempera‐ture will also serve to  ensure  uniformity of the cyclic pouring  operation  as well as casting quality