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shell-molding?

By Admin on

Shell-mold casting yields better surface quality and tolerances. The process is described asfollows:The 2-piece pattern is made of metal (e.g. aluminum or steel), it is heated to between 175°C- 370°C,and coated with a lubricant, e.g. silicone spray.Each heated half-pattern is covered with a mixture of sand and a thermoset resin/epoxy binder.The binder glues a layer of sand to the pattern, forming a shell. The process may be repeated to get athicker shell.The assembly is baked to cure it.The patterns are removed, and the two half-shells joined together to form the mold; metal is pouredinto the mold.When the metal solidifies, the shell is broken to get the part.

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