Molding methods centrifugal casting

Coppers and high copper aEoys can be successhEly cast using the centrifugal, continuous, investment, permanent, plaster, and sand molding methods. 

Properties of red brass alloys are given in Table 9. The members of this group are cast using the centrifugal, continuous, investment, and sand molding methods. General tensile strengths vary from 170 to 210 MPa (25,000—30,000 psi) minimum as cast in sand molds. 

Properties of copper—nickel alloys are Hsted in Table 14. The alloys in the copper—nickel group have been successfully cast using the centrifugal, investment, permanent, and sand molding methods. The minimum tensile strengths on test bars cast in sand molds are 207—310 MPa (30,000—45,000 psi). 

Colver (1918), 10, 319 442-483, 671 (Various methods of obtaining high d casts of HE are reviewed, eg, direct or press casting, chilled molds or shells, cold core expl, and centrifugation) h) Anon, ChemAge 1, 385—6 ... 

Pouring liquid metal into the mold requires a steady hand and constant attention. When the mold containing liquid metal is placed in a centrifuge, hot metal can fly out of the centrifuge. This is why it is preferable to use the vacuum casting method, for which a centrifuge is not needed. 

This method is ideally suited to the casting of spherical shapes, but the outer shape may be modified with the use of special techniques. Normally, metal molds are used and plastic is poured into the rotating mold that may spin about a horizontal, inclined, or vertical axis. The centrifugal force, even though minor relative to gravity, improves both homogeneity and accuracy. 

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