Resin & Shell Castings
Patterns are made in halves on separate plates (cope and drag) typically made from cast iron or steel. The molds are heated and sand with a heat-setting binder is sifted on to the hot mold. The shell wall gets thicker and stronger the longer it contacts the heated pattern. When the correct thickness is obtained, the shell mold is ejected from the pattern. The 2 halves of the mold are glued together and molten metal is poured into the cavity created. After solidification the sand shell is removed and parts are ready for finishing.
-Most castable alloys
-Good dimensional accuracy
-Good surface finish depending on alloy
-Moderate wall thickness, alloy dependent
-Moderate draft required
-Medium to high volume
-Medium to high tooling cost
-Very little restriction to part shape
RESIN & SHELL CASTINGS
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