Casting is a process in which molten metal is poured or injected and allowed to solidify in a suitably shaped mold cavity. During or after cooling, the cast part is removed from the mold and then processed for delivery.
Casting processes and cast-material technologies vary from simple to highly complex. Material and process selection depends on the part's complexity and function, the product's quality specifications, and the projected cost level.
Plaster Mold casting employs molds formed with a gypsum-plaster base. It is basically similar to sand casting in that the mold, usually made in two halves corresponding to the cope and drag of sand molding, is assembled for pouring of the mold. Plaster mold castings are best where the need for thin walls, accuracy, and good surface finish justifies their cost. Bladed, rotated castings such as pump and impeller parts, which do not usually lend themselves to die casting, are uniquely suitable for plaster mold casting. Large numbers of electronic waveguide components have been cast in plaster because the accuracy and finish required on their internal surfaces are especially difficult to obtain by sheet metal forming, machining, or hand working. KEYWORDS for this process: casters, moulds, moulding, moulders, molds, molders, molding
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