Investment Castings


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 with complex shapes, precise dimensions, and smooth surfaces such as blades, impellers, and nozzles. Because the heat-resistant alloy material is difficult to machine and the shape of the parts is complicated, it is impossible or difficult to manufacture by other methods. Therefore, it is necessary to find a new precision molding process, so we learn from the lost wax casting handed down from ancient times. The improvement of modern investment casting method has obtained important development on the basis of ancient technology. Therefore, the development of the aviation industry has promoted the application of investment casting, and the continuous improvement and perfection of investment casting has also created favorable conditions for the aviation industry to further improve its performance.


my country began to apply investment casting to industrial production in the 1950s and 1960s. Since then, this advanced casting technology has been greatly developed, and has been widely used in manufacturing industries such as aviation, automobiles, machine tools, ships, internal combustion engines, gas turbines, telecommunication equipment, weapons, medical equipment, and knives. Manufacture of fine art.


The so-called investment casting process, simply put, is to use fusible materials (such as wax or plastic) to make a fusible model (abbreviated as investment model or model), and coat several layers of special refractory coating on it, after drying and hardening After forming an integral shell, the mold is melted from the shell with steam or hot water, and then the shell is placed in a sand box, and dry sand is filled around it for molding, and finally the mold is put into a roasting furnace for high temperature Roasting (if a high-strength shell is used, the molded shell can be fired.