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Sand
Casting
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start with a pattern (a) which is the same shape
as the required article, allowing for the
shrinkage of the metal as it cools and the amount
of material to be removed in the process of
finishing it. A
frame – the mould box – is filled with sand
(b). The pattern is then put into the sand which
is then compacted (c). Then the pattern is
extracted from the sand, leaving the shaped hole
into which the metal is to be poured (d). To
form the other half of the mould, sand is
compacted into another mould box, and channels to
allow the metal to enter, and the air to exit, are
formed, referred to as runners and risers
respectively (e). The
mould is then closed and molten metal poured into
the hole. This is the exciting bit (f). Once everything cools down, the mould is knocked apart revealing the metal article with the runners still attached (g). These are trimmed (“fettled”) and the item is then ready for the next process (h).
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The photos above show the mould being closed, and then the metal being poured during a casting demonstration at a maritime festival. |
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Index :: Examples :: Bronze Types :: History :: Sand Casting :: Patternwork :: Fabrication :: Lost Wax :: Other Things |
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