Investment casting, also known as lost wax casting, includes processes such as wax pressing, wax repairing, tree formation, dip slurry, melting wax, casting molten metal, and post-treatment. Lost wax casting is to use wax to make the wax mold of the parts to be cast, and then apply wax to the wax mold, which is the mud mold. After the clay mold is dried, put it in hot water to melt the internal wax mold. Take out the clay mold after melting the wax mold and then roast it into a ceramic mold. Once roasted. Generally, the pouring gate is left when making the mud mold, and then the molten metal is poured from the pouring gate. After cooling, the required parts are made.