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Casting is to melt cast iron or steel and pour it into a pre-prepared mold shell. After cooling, the shell is removed and it becomes a rough part. This process reduces the amount of processing, especially for parts with more surface surfaces that are difficult to process. Casting can solve the problem. In order to avoid processing difficulties and improve production efficiency, sand casting is to use quartz sand as a sand mold and then it can be poured after drying. It is characterized by simple and low cost, and parts with rougher shapes and low precision requirements can be used. Investment casting is made of plastic foam. Roll the coating on the surface of the molded tire, dry it and put it in the flask to vacuum the flask before casting. The hot molten iron burns the foam into gas and cools it into a part. This casting is also called vacuum casting, which has a higher cost. The burning gas has a great impact on the environment. Precision casting is also wax mold casting. The mold is made of paraffin, then rolled with paint and quartz sand, and then dewaxed to become a mold shell. The molten iron is poured in to cool the mold shell. It becomes a part when it is knocked out. The parts produced by this process have good surface finish and precise dimensions, so it is called precision casting.