Precision casting refers to the process of obtaining precise size castings. Compared with the traditional sand mold casting process, precision casting can obtain more accurate casting size and better surface finish. It includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting.

Precision casting, also known as lost wax casting, its products precision, complex, close to the final shape of parts, can not be processed or rarely processed directly used, is a near net form of advanced technology.

Precision casting, also known as lost wax casting, its products are precise, complex, close to the final shape of the parts, can not be processed or rarely processed directly used, so investment casting is a near net form of advanced technology.

Ancient China: wang ziwu ding, copper ban, copper lion and so on, are the masterpiece of investment casting. Since investment casting was used in industrial production in the 1940s, it has been developing at a rapid speed for half a century. In particular, European and American countries are developing rapidly. Investment casting is used in almost all industrial sectors, especially electronics, petroleum, chemical industry, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pump and valve. In recent years, China has also developed rapidly.

The development of investment casting technology enables investment casting not only to produce small castings, but also to produce large castings. The outline size of the largest investment casting is nearly 2m, while the minimum wall thickness is less than 2mm. At the same time, the investment casting is more precise, in addition to linear tolerance, parts can also achieve a higher geometric tolerance. The surface roughness of investment castings is getting smaller and smaller, up to Ra0.4 m.