Lian Yungang precision casting factory melt mold casting uses paraffin material, compressed into a precise and smooth wax, coated in multiple layers with refractory materials, until a slurry is dried and hardened and formed in a shell, and then solidified for melting the outflow. The mold shell is roasted to a solid state and dried. Finally, the molten liquid metal is poured into the shell and cooled. After solidification it becomes an accurate smooth casting. This kind of casting process can produce precise complexity, close to the final shape of the product, and can be directly used in the metal parts or fine arts and crafts, so it is a near net shape of the metal liquid forming process. Compared with sand casting method, has the following characteristics:

1) casting dimension accuracy, low surface roughness, can be achieved with little or no machining;

2) casting thin walled parts or very small pieces of castings, especially suitable for castings with patterns, words, or grooves;

3) capability of particularly complicated castings, or a combination of many parts and weldings.

China is one of the sources of investment casting technology. According to research, in the spring and autumn period from 2500 years ago has been a loss of wax casting. In 1978, the statue of Ceng Houyi's tomb excavated in Suizhou, Hubei, and the plate was representative of early wax casting. The modern investment casting process was formed in early twentieth century. During the Second World War, the United States, Britain and other countries, due to the need to develop the national defence and aviation, first used investment casting methods to produce jet turbine engine blades. Since the 1980s, output value and quality of investment casting in the world has greatly increased and improved. The current investment casting is developing in the direction of precision, large, complex components.

China's investment casting is in the 1950s began to be applied industrial production, the first from the aerospace and aviation sectors and gradually developed to all industrial sectors with a wide range of applications.