Shell molding

As compared to sand casting, this process has better dimensional accuracy, a higher productivity rate, and lower labour requirements.

The pattern, a metal piece in the shape of the desired part, is reused to form multiple shell molds.

A reusable pattern allows for higher production rates, while the disposable molds enable complex geometries to be cast.

Typical parts are small-to-medium in size and require high accuracy, such as gear housings, cylinder heads, connecting rods, and lever arms.

Trimming and cleaning processes are required to remove any excess metal from the feed system and any sand from the mold.

Examples of shell molded items include gear housings, cylinder heads and connecting rods.

Setup and production of shell mold patterns takes weeks, after which an output of 5–50 pieces/hr-mold is attainable.

[6] Advantages Disadvantages Cylinder head, connecting rod, Engine blocks and manifolds, machine bases.