Precision casting is also called lost wax casting, its products are sophisticated, complex, close to the final shape of the parts, can be processed or rarely processed directly on the use of investment casting is a nearly net shape of the advanced process.
Ancient China: Prince Wu Ding, copper ban, bronze lions, etc., are investment casting masterpiece. Since the 20th century, 40 years of investment casting for industrial production, half a century has been developed at a faster rate. Especially in Europe and the United States to develop rapidly. Casting for the aviation, weapons sector, almost used in all industrial sectors, especially electronics, petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pumps and valves and other departments. In recent years, China has developed rapidly.
The development of investment casting technology makes the investment casting not only produce small castings, but also can produce larger castings. The largest size of castings is nearly 2m, while the minimum wall thickness is less than 2mm. At the same time, the investment casting is also more precise, in addition to linear tolerance, the parts can achieve high geometric tolerances. The surface roughness of the investment casting is also getting smaller and higher, reaching Ra0.4μm.