Modern investment casting precision casting method

Update:31 Jan 2019
Summary:

The practical application of modern investment casting […]

The practical application of modern investment casting methods in industrial production was in the 1940s. At that time, the development of aviation jet engines required the manufacture of heat-resistant alloy parts such as blades, impellers, nozzles, and the like, which were complex in shape, accurate in size, and smooth in surface. Because the heat-resistant alloy material is difficult to machine, the shape of the part is so complicated that it cannot be or is difficult to manufacture by other methods. Therefore, it is necessary to find a new precision molding process, so it is based on the lost wax casting that has been handed down from ancient times. The improvement of the process, the modern investment casting method has achieved important development on the basis of ancient techniques. Therefore, the development of the aviation industry has promoted the application of investment casting, and the continuous improvement and improvement of investment precision casting has also created favorable conditions for the aviation industry to further improve its performance.

In the 1950s and 1960s, China began to apply investment casting to industrial production. Since then, this advanced precision casting process has been greatly developed, and has been widely used in the manufacturing industries of aviation, automobiles, machine tools, ships, internal combustion engines, gas turbines, telecommunications equipment, weapons, medical equipment and cutting tools, and also used in the manufacturing industry. Manufacturing of arts and crafts.

The so-called investment casting process, simply by using a fusible material (such as wax or plastic) to make a fusible model (referred to as investment or model), coated with several layers of special refractory coating, dried and After hardening to form a monolithic shell, the model is melted from the shell by steam or hot water, then the shell is placed in a sand box, and the dry sand is filled around it, and finally the mold is placed in the roaster. High-temperature baking (if a high-strength type shell is used, the mold can be directly fired without demolding), and the mold or shell is fired, and molten metal is poured therein to obtain a casting.