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Shell Mold Casting Services Job Shops
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ABOUT Shell Mold Casting Services
Technology: Shell Mold Casting Services are metal molding operations that produce metal forms using techniques that are similar to sand casting with several exceptions. Shell form casting uses a reusable pattern around which a layer of sand and resin is deposited. This form is combined with a mating half in a flask where the sides are buttressed with additional sand or shot. Molten metal is poured into the mold, much like with sand casting.
Shell Mold casting produces better finishes than ordinary sand casting. The shells are made in a hot box, where the pattern is heated and the sand and resin dumped over it. Heat cures the resin, making for a very durable mold half.
Advantages: Shell mold casting lends itself to automated processing.
Capable of producing parts with thinner walls than sand casting
Good for lightweight castings where dimensional control is important
Good for steel castings weighing under 20 lbs.
Better tooling life than die casting dies
Shell Mold Casting Limitations
Generally more expensive than sand casting or forging, but costs can be saved through minimal post cast machining
Molds are less porous than sand molds, so gases must be managed
Patterns must be heated to cure shell resins, so metal patterns usually required
Applications: Shell mold casting is used to make complex parts with higher surface finishes than achievable through sand casting.