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Material Science and Technology for kids |
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Sand casting |
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| Sand casting Lesson/Tutorial | Sand
casting, like sand castles, makes use of the way damp sand sticks together
and forms shapes.
To make a shape via sand casting, first, a wooden pattern cut to the shape of one half of the desired final cast shape is placed in an iron box. Sand is then packed firmly around it. The pattern is then removed and an indention in the sand, like a footprint on the beach, remains. Next, channels for the molten metal are cut into the mold. The two halves of the mold are then clamped together and the molten iron or other metal alloy is poured into the sand mold. Since sand melts at a much higher temperature than any metal, the sand is unaffected when the molten metal comes in contact with it. The molten metal pushes out the air in the mold when it flows through the mold. The air escapes through a channel called the riser. Extra metal is poured in to allow for the shrinkage of the metal as it cools. Once the metal has completely cooled and formed a solid, the sand is easily brushed away. The final product is a metal shape. |
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