The ways of precision casting includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting.
The use of precision casting as follow: Use appropriate materials to make investment casting molds, then throw the sanding stick or paint on the investment casting molds. After drying the molds, melt the internal molds to get the cavity. High temperature's calcinations to obtain enough strength and the molds are burnt out the residual pattern materials. Pouring the metal materials in the molds, and the molds are unpacked sand, to obtain high-precision products. Finally, deal with the molds for heat treatment and cold based on product needs.
Precision casting is also known as lost wax casting. Precision and complexity of its products, makes it close to the final part shape. You can direct use with little time procession or with out processing, so precision casting is an advanced technology of near shape forming. Prince Wu Tripod, Copper Jin, Copper Lions, etc., are a masterpiece of casting in ancient China. Since precision casting is used for industrial production in the 1940's, it has been developing at a rapid pace during the half-century especially in the European and American countries. .
Nowadays precision casting for the aerospace, weapons departments is almost used in all industrial sectors, especially electronics, petroleum, chemicals, energy, transportation, light industry, textiles, pharmaceuticals, medical equipment, pumps and valves, and other departments.
Not only can precision casting produce small castings, it can also produce large castings. The maximum size of the outline of precision casting mold is nearly 2m, while the minimum thickness is less than 2mm. In addition, the surface angle of the precision casting is much smaller, which can be achieved Ra0.4μm.