Centrifugal casting as it is now done

Modifications and adaptations of the principle of  centrifugal  casting also exist under the various  headings  of centrifuge casting, semicentrifugal cast ‐ing and pressure casting. Today, the technique  of  centrifugal casting is used a great deal in  combination  with the famous and age‐old lost‐wax  (cire perdue) process. Centrifugal casting as it is  now  done is more aptly called centrifuge casting.  True  centrifugal casting is used primarily for  articles  with hollow cores. 

• This method is identical to other lost‐wax  modeling  and molding procedures except that  the  mold‐is attached to a revolving shaft  which  rotates the entire mold on an angle. The  molten metal enters the mold from a  stationary  crucible position above the rotating  mold,  and flows down into the pattern  chamber  where it is forced centrifugally  against  the inner walls until it solidifies to the  thickness  desired for the finished hollow  casting.  (Fig. 77)

• Another modification of these various centrifugal  casting  processes and one which makes possible a  greater  degree of refinement in articles cast by the  lost ‐wax process is the pressure casting technique.  In  this procedure, the upper portion of the machine  is  placed over the mold that is to receive the  molten  metal. As this is being done, a sufficient  amount  of air pressure is applied to the mold to  force  out the gases and allow the metal to flow  in ‐to even the most intricate details incorporated in  the'pattern chamber. The use of pressure casting  machines  using this technique successfully  produces  very intricate castings in precious metals