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Shell Molding

time2017-10-09

Shell molds are produced by pouring resin covered sand onto a heated iron pattern. The resin fuses together and cures to create a hard ‘biscuit’ shell.
 
Parts produced using the shell process achieve excellent reproduction of detail, a very good surface finish and CT9 tolerance for high dimensional accuracy which reduces machining requirements. Complex core assemblies are possible due to the strength of the cores.
 
We have two shell casting methods;
 
Conventional
Shells are cast on a continuous loop track
Suitable for parts up to 25kg
Medium to high volume production
 
Vacuum backed
Vacuum backed shell molding process is unique to Newby Foundries. Shells are embedded inside a sand filled flask under vacuum pressure.
The increased pressure allows parts up to 100kg to be cast at a high tolerance
Other advantages include minimal mold dilation and increased gas removal
Medium volume production