An introduction to Shell Mold Casting

A type of heat-hardened sand (Shell Mold Casting) is used to cover a metal template heated to 180 ~ 280℃ to harden it into a thin Shell (the thickness of the thin shell is usually 6 ~ 12 mm), and then warm to solidify the thin shell to achieve sufficient strength and stiffness. Therefore, the upper and lower two shell clamping fixture or resin adhesive, no sand box can be formed casting, casting metal template heating temperature is generally about 300℃, the use of sand for resin sand, namely phenolic resin resin as binder resin sand. The same method can also be used to make the core into thin shell core manufacturing thin shell casting commonly used tipping method. The thin shell core is often manufactured by blowing.

Using resin sand to make thin shell mold or shell core can significantly reduce the amount of sand used, and the resulting casting has a clear profile, smooth surface, accurate size, and can be processed without mechanical processing or only a small amount of processing. Therefore, Shell Mold Casting is especially suitable for the production of various alloy castings with large batch size, high dimensional accuracy requirement, thin wall and complex shape. But the expensive resin used in Shell Mold Casting, the high cost of precision machining and the pungent odor produced when poured, have somewhat limited the widespread use of the method. Resin sand thin shell core can be combined with ordinary sand mold or metal mold to make various castings.