Method of making metal castings

Details Method of making metal castings Method of making metal castings

B - Operations, Transporting

22

C

22/120, 22/162

B22C 7/02 (2006.01) B22C 9/04 (2006.01) B22D 18/04 (2006.01) B22D 21/00 (2006.01)

Patent

CA 1281884

This invention relates to a method of making metal castings using the full mould process, namely providing an in situ destroyable pattern of, for example, expanded polystyrene, embedding the pattern in unbonded sand, consolidating the sand to form a mould in which is defined a mould cavity, feeding molten metal into the cavity, permitting the metal to solidify within the cavity to form a casting, interrupting the feed of metal to the cavity and removing the casting from the cavity. The pattern may be destroyed in situ either by the metal as it is fed into the cavity, or by the application of heat prior to introduction of the metal into the cavity. The metal is aluminum or an aluminum alloy and at least a part of the mould is formed of sand (comprising at least 50% sand by weight). The invention further relates to apparatus for casting metal according to the above, the metal article produced therefrom and a mould for making the metal castings comprising consolidated unbonded sand in which is embedded an in situ destroyable pattern to define a mould cavity.

523770

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