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A molding sand mixture, usually green sand or bentonite, is blown into a rectangular steel chamber using compressed air. The molding sand is then squeezed between two patterns, which are on the two ends of the chamber. After squeezing, one of the chamber plates swings open and the opposite plate pushes the finished mold onto a conveyor.
The term "sand casting" can also refer to an object produced via the sand casting process. Sand castings are produced in specialized factories called foundries. In 2003, over 60% of all metal castings were produced via sand casting. [1] Molds made of sand are relatively cheap, and sufficiently refractory even for steel foundry use.
Bremen Castings foundry produces castings made from recycled materials such as plate and structural steel and old cast products. A Cupola and medium frequency furnaces are used at the foundry for melting recycled materials to be poured into green sand molds produced by match plate molding machines.
Centrifugal casting at Goldens' is designed for specific product applications, as opposed to other foundries strictly devoted to the centrifugal process, such as steel pipe foundries. The centrifugal casting process was added in the late 1990s as a complement to the green sand mold processes already in place.
Green-sand cores. Green-sand cores makes casting long narrow features difficult or impossible. Even for long features that can be cast it still leave much material to be machined. A typical application is a through hole in a casting. [2]
But considered "green" in the sense that it is used in a wet state (akin to green wood). According to the Cast Metals Federation website, an alternative casting method is to heat-dry the molded sand before pouring the molten metal. This dry sand casting process results in a more rigid mold better suited to heavier castings.
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The pattern is made of wax, wood, plastic, or metal. The molds are constructed by several different processes dependent upon the type of foundry, metal to be poured, quantity of parts to be produced, size of the casting, and complexity of the casting. These mold processes include: Sand casting – Green or resin bonded sand mold.
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