What Are The Working Steps In Shell Moulding Process?

Shell mold casting is a casting method to produce castings with thin shell mold, also it’s ideal for medium-to-high-volume production. Similar to the sand casting, in that molten metal, a dispensable mold is poured. Shell casting was invented by German J. Cronin in 1943. It was first used in Germany in 1944 and began to be used in other countries after 1947.

What Are The Working Steps In Shell Moulding Process?

A kind of heat hardening molding sand (phenolic resin coated sand) is used to cover the metal template heated to 180-280 ℃ to harden it into a thin shell (the thickness of the shell is generally 6-12mm), and then the shell is heated and solidified to achieve sufficient strength and rigidity. Therefore, the upper and lower shell can be clamped with clamps or bonded with resin, and the mold can be formed without sand box, The heating temperature of casting metal template is about 300 ℃, and the molding sand used is resin sand, that is, resin sand with phenolic resin as binder. Similarly, the core can be made into thin shell by the above method, and the tipping bucket method is commonly used to make the thin shell mold. The blowing method is commonly used in the manufacture of thin shell core.

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