Investment casting, also known as "lost wax casting",usually make fusible material the appearance,the appearance of the surface layer of refractory coating made of a number of shell, and then discharged shell look like melting, resulting in the parting line-free mold, the calcinated to fill sand casting foundry program. The appearance of waxy material widely used in manufacturing, will be casting Guchang known as the "lost wax casting." Production of investment casting is available alloy types are carbon steel, alloy steel, heat-resistant alloys, stainless steel, precision alloy, permanent magnet alloy, bearing alloys, copper alloys, aluminum, titanium, and iron and so on. Castings are generally more complex shapes, castings can be cast out of the smallest hole diameter 0.5mm, minimum wall thickness of casting 0.3mm. In production can be some of the original parts by the combination of several components, by changing parts of the structure, designed as a whole from the parts and direct investment casting cast out, to save processing time and the consumption of metallic materials, so that part structure more is reasonable. The weight of castings cattle mostly zero scores (ie, tens of grams to several kilograms), too heavy castings casting production of more trouble, but the current production of large castings the weight reached about 800 cattle. Casting process is complex and difficult to control, use and consumption of more expensive materials, so it applies to the production of complex shape, high precision, or difficult for other processing of small parts, such as turbine engine blades.