First the object needed to replicate wax casting, and dry and then dipped into a ceramic containing pool, the wax replica covered with a layer of ceramic membrane, repeating the steps until the outer membrane is sufficient to support the casting process (about 1/4 inch 1/8 inch), then melting the wax mold, and cast away die. Thereafter, the mold needs to be heated many times, increasing the hardness before casting. This method has good accuracy and can be used as a foundry for high melting point metals (such as titanium). But because the price of ceramic is quite high, and the manufacture needs many heating and complex, the cost is very expensive.
Advantage is low cost, because of the use of the mold sand can be used repeatedly; the disadvantage is time-consuming mold manufacture, the mold itself cannot be reused to damage can be achieved after finished. Die Casting, a mold made from a metal whose melting point is higher than that of a material. They are subdivided into gravity casting, low pressure casting and high pressure casting. Subject to the melting point of the mold, the casting metal is also limited. Wax loss method (Investment, Casting, Lost-wax, casting), this method can be used for the outer shell casting method and solid casting method.
Materials used most frequently in casting technology. Sand casting method (Sand Casting) by using sand as the mold material, according to the different components of the sand can be divided into wet sand casting method (Green Sand Mold), the surface of dry sand mold casting method (Dry Sand Mold) and so on, but not all are available in sand casting.
