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Casting Processes - Shell Casting
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Shell casting or shell moulding process offers better surface finish, better dimensional tolerances, and higher throughput due to reduced cycle times than sand casting.
A heated metal pattern is covered with a mixture of sand and thermoset plastic. This causes a skin of about 3.5 mm of sand/plastic mixture to adhere to the pattern. This skin is removed from the pattern to form the "shell mould". The two halves of the shell mould are secured together and the metal is poured in the shell to form the part. Once the metal solidifies, the shell is broken away and the component removed. Shell casting can produce complex parts with good surface finish and dimensional tolerances.
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