Lost wax casting, now called investment casting, is a casting process with less or no cutting. It is an excellent process technology in the foundry industry and its application is very extensive. It is not only suitable for the casting of various types and various alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even castings that are difficult to cast by other casting methods, which are difficult to cast, are not easy to process. Can be cast by investment casting.