Science and technology are the primary productive forces. With the reform and opening up in the past 30 years, the industry has developed rapidly. Therefore, precision casting also has a good development opportunity. Precision casting is widely used in aerospace, electronics, petroleum, chemical industry, transportation, instruments, shipbuilding and other industries, The need of agricultural machinery and the need of daily life can not be without the existence of precision casting.

Compared with traditional casting process, precision casting can obtain relatively accurate shape and high casting precision. The so-called precision casting process is simply to make a fusible model with fusible materials, coat it with several layers of special fire-resistant coatings, dry and harden it to form an integral mold shell, then melt the model from the mold shell with steam or hot water, then place the mold shell in the sand box, fill the dry sand around it for molding, and finally put the mold into the baking furnace for high-temperature baking. After the mold or mold shell is baked, And the molten metal is poured therein to obtain a casting.

At present, there are two kinds of precision casting technology: wax loss precision casting and pressure regulating forming precision casting.

Wax loss precision casting is now called investment casting. It is a kind of precision casting process with little or no cutting. It is an excellent process technology in the precision casting industry and is widely used. It is not only suitable for precision casting of various types and alloys, but also the dimensional accuracy and surface quality of the produced castings are higher than those of other precision casting methods. Even the complex, high-temperature resistant and difficult to process castings that are difficult to be cast by other precision casting methods can be cast by investment casting.

Pressure regulating forming precision casting technology is a new type of casting technology invented to solve the casting production problems of large complex thin-walled parts. Using this technology to produce large-scale complex thin-walled castings, better filling and feeding capacity can be obtained, and the casting grain is refined, the density is increased, and the performance is significantly improved. With the continuous research and development of this technology, the application effect and application scope of this technology have been continuously strengthened and expanded. At present, pressure regulating forming precision casting technology has been applied in the production of a large complex thin-wall aluminum alloy casting for aviation, and the technical benefits are very obvious.

More and more mechanical products adopt precision casting, which is inseparable from the two advantages of precision casting:

1. Precision casting makes complex castings of various alloys, especially high-temperature alloy castings. For example, the blade of a jet engine has a streamlined profile and a cooling inner cavity, which can hardly be formed by machining. The precision casting process can not only achieve mass production, ensure the consistency of castings, but also avoid the stress concentration of residual knife marks after machining.

2. Precision casting: because investment casting has high dimensional accuracy and surface finish, it can reduce machining work. Only a little machining allowance can be left at the parts with high requirements. Even some castings can be used without machining because they only have grinding and polishing allowance. It can be seen that the use of precision casting method can save a lot of machine tools and machining hours, and greatly save metal raw materials.