Precision Casting Is The General Name Of The Casting Process
Precision casting is the general name of the precision casting process. Compared to the traditional sand casting process, precision casting made the casting size is more accurate, better surface finish.
Precision casting basic concept
Precision casting It includes: investment casting, ceramic casting, metal casting, pressure casting, lost mold casting.
Which is more commonly used for investment casting, also known as lost wax casting: the use of suitable melting materials (such as paraffin) to create investment in the mold on the repeated wear refractory coating and sand-resistant sanding process, hardening shell and dry; Dissolving the internal melt mold to obtain a cavity; firing the shell to obtain sufficient strength, and burning the residual investment material; pouring the desired metal material; solidifying the cooling, removing the sand after the shell, so as to obtain high Precision of the finished product. According to the needs of the product or heat treatment and cold processing and surface treatment.
Precision casting development of
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 sophisticated, 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.