Precision casting is a casting method relative to the traditional casting process. It can obtain relatively accurate shape and high casting precision. The more common practice is to first make the electrode with the required blank (with a very small margin or no margin), and then use the electrode to corrode the mold body to form a cavity. Then cast the wax by casting method to obtain the original wax model. Brush the high temperature resistant liquid sand layer by layer on the wax mold. After a sufficient thickness is obtained, it is dried in the sun, and then heated to melt the internal wax mold and obtain a common cavity with the desired blank. Cast iron water is poured into the cavity, and after curing, the shell is peeled off, and a precision-made finished product can be obtained.

Lost wax casting is now called investment casting. It is a casting process with little or no cutting. It is an excellent craftsmanship in the casting industry and is widely used. It is not only suitable for casting of various types and alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even complex, high temperature resistant, and difficult to process castings that are difficult to cast by other casting methods. All can be cast by investment casting.

The practical use of modern investment casting methods in industrial production was in the 1940s. At that time, the development of aviation jet engines required the production of heat-resistant alloy parts with complex shapes, accurate dimensions and smooth surfaces, such as blades, impellers, and nozzles. Because the heat-resistant alloy materials are difficult to machine and the shapes of the parts are so complicated that it cannot or is difficult to make them by other methods, it is necessary to find a new precise molding process, so learn the lost wax casting from ancient spreading. The improvement of modern investment casting methods has made important progress on the basis of ancient craftsmanship. Therefore, the development of the aviation industry has promoted the use of investment casting, and the continuous improvement and improvement of investment casting has also created favorable conditions for the aviation industry to further improve its functions.

my country began to use investment casting in industrial production in the 1950s and 1960s. Since then, this advanced casting process has been greatly developed, and it has been widely used in aviation, automobiles, machine tools, ships, internal combustion engines, steam turbines, telecommunication instruments, weapons, medical equipment and knives. It is also widely used in arts and crafts. production of goods.

Another advantage of the investment casting method is that it can cast complex castings of various alloys, especially superalloy castings. For example, the blade of a jet engine has a streamlined outline and an inner cavity for cooling, which can hardly be formed by machining. The investment casting process can not only achieve mass production, but also ensure the commonality of castings, and avoid the stress concentration of residual knife lines after machining.

The pouring cup is a basic component that serves the casting technology, especially has a very close relationship with the development of the steel industry. The pouring cup is one of the components of the smelting process equipment.

The sprue cup is primarily used to guide the passage of liquid metal into the cavity. If the sprue cup is arranged unreasonably, it may cause defects such as pores, trachoma, iron beans, slag holes, shrinkage holes, cracks and lack of pouring in the casting. Therefore, the correct selection of the structure and size of the pouring cup and the reasonable placement of the casting is a very important task.