Design Criteria -- Risers are reservoirs of
molten metal to supply the solidifying, contracting molten metal in the casting with
make-up metal. They are used to prevent internal or external voids due to shrinkage.
- Risers are placed and sized to provide sufficient metal flow into the
mold during cooling to compensate for shrinkage.
- Steel castings require shorter metal flow paths and larger amounts of
metal to compensate for high shrinkage. This requires that multiple risers are evenly
distributed around the casting.
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| Example of Risers and Gates |
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