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Shell Mold Casting

  • Author:June
  • Source:www.xy-global.com
  • Release on:2022-04-21
Shell mold casting is a one-time mold casting process that uses coated sand to form a model. It is used to produce small and medium-sized parts that require high dimensional accuracy. The molten metal is poured into disposable shells, which are usually thin-walled shells. The metal mold, which is the same shape as the finished product, is reused to produce many shell shapes.

1. The process of shell casting:

Cover the metal template heated to 180-280°C with a heat-hardening molding sand (phenolic resin-coated sand) to harden it into a thin shell (the thickness of the thin shell is generally 6-12 mm), and then heat and cure The thin shell can achieve sufficient strength and rigidity. Therefore, after the upper and lower shells are clamped with a clamp or glued with resin, the mold can be formed without a sand box. The heating temperature of the casting metal template is generally about 300 ℃ , The molding sand used is resin sand, that is, resin sand with phenolic resin as a binder. The same method can also be used to make the core into a thin shell core, and the tipping bucket method is commonly used to make thin shell castings. Blowing is commonly used to manufacture thin shell cores.

2.the characteristics of shell casting:

The use of resin sand to make thin shell molds or shell cores can significantly reduce the amount of molding sand used, resulting in castings with clear contours, smooth surfaces, and precise dimensions that can be machined without or only a small amount. Therefore, shell casting is particularly suitable for castings of various alloys that require high dimensional accuracy, thin walls, complex shapes, and high-quality surface finish requirements, because this process has better surface finish and tighter tolerances than sand casting. However, the resin used in shell casting is expensive, the template must be precisely processed, the cost is high, and a pungent odor is generated during casting, which limits the wide application of this method to some extent. Resin sand thin shell core can cooperate with ordinary sand mold or metal mold to manufacture various castings. Shell casting can also be used for the manufacture of actual parts, but since the molds are not reusable, this method is not suitable for mass production.

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