Sandcasting

Sandcasting is a metal casting process that uses sand as the mold material. It is one of the oldest and most common casting methods, employed for a wide variety of metal alloys and object sizes. The process begins with a pattern, which is a replica of the desired cast object. This pattern is then placed in a flask, a metal frame, and surrounded by damp sand. The sand is compacted around the pattern to create a mold cavity. Once the sand is packed, the pattern is removed, leaving an impression in the sand that forms the mold. The mold is then closed, and molten metal is poured into the cavity. After the metal cools and solidifies, the sand mold is broken away, revealing the cast part.

There are several variations of sandcasting, including green sand casting, dry sand casting, and shell molding. Green sand casting uses a mixture of sand, clay, and water, which remains moist during the casting process. Dry sand casting utilizes sand with binders that are baked to harden the mold. Shell molding involves using a pre-coated mixture of sand and resin, which is heated to form a rigid shell mold. Sandcasting is favored for its low cost, ability to produce large and complex shapes, and its suitability for both ferrous and non-ferrous metals. Common applications include engine blocks, pump housings, and decorative items.