Precision casting is compared with the traditional casting process of a casting method.It can obtain relatively accurate shape and high precision casting.A common approach is: first, in accordance with the requirements of product design and production (can leave allowance is very small or not allowance) mould, casting wax, using the method of casting wax models to obtain original;On the wax pattern repeat coating and sanding process, sclerosis type shell and dry;Then internal wax models of melting drop, for dewaxing, get the cavity;Roasting shell in order to obtain sufficient strength;Casting need metal materials;After shelling of black sand, in order to gain high precision of finished products.According to the requirements of the product or heat treatment and cold working.