In gravity metal casting molten aluminium is poured into a metallic tool. The casting temperature is about 750°C. The tolerances and surface finish are good. The use of sand cores in gravity die casting enables casting of very complex components.
Gravity metal casting method is competitive casting method when production quantity is relatively small or when heat treatment is needed to improve the mechanical properties. This metal casting method gives better tolerances and surface finish than sand casting. The tooling costs are somewhat higher than by sand casting.
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