China Shell Mold Mould Casting Manufacturers

Shell Molding Iron Castings

Investment casting, resin sand casting and shell mold casting are generally used for shell iron castings. Investment casting can only cast smaller shell iron castings due to low efficiency and high cost, while resin sand casting and shell mold casting can cast larger cast iron shell parts. Because resin sand casting needs to wait for resin hardening and manual operation, the efficiency is not high, and the cost is relatively high. For larger shell parts, the size accuracy is good and the efficiency is high, but only a larger horizontal core shooting machine is needed. "Leibo Foundry" has a large horizontal core shooting machine, which can cast shell castings with a diameter of 500 mm and a height of 250 mm. Shell castings are of good quality and low price.

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Shell Molding Casting Process

1. Making metal Patterns

The pre-coated resin sand needs to be heated in the patterns, so iron patterns are the necessary tooling to make shell molding castings. The metal pattern costs will be more expensive than green sand casting patterns.

2. Making Pre-coated Sand Mold

The workers install the metal patterns on the molding machine. The pre-coated resin sand will be shooted into the patterns, and after heating, the resin coating will be melted, so the sand mold will become solid sand shell and cores.

3. Melting Iron

This casting process only is used to produce grey iron and ductile iron castings in China.

4. Pouring metal

When the melted iron meet the requirements, then they will be poured into the shell molds. Sometimes, the shell molds will be buried into green sand, sometimes, the shell molds will be stacked up by layers, according to characters of casting design.

5. Sand Blasting & Cleaning

After the cooling of iron, the iron castings will be cleaned by sand blasting equipments. Then, the workers will grind the gating head and parting lines. Then, the raw castings will be completed.