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Precision casting is a special casting method relative to the traditional foundry precision casting art. It can obtain relatively accurate shape and high casting accuracy. The more common practice is: first of all, according to the product requirements to design and make (can leave a very small margin or no margin) mold, cast wax by casting method, obtain the original wax mold; Repeat the coating and sanding process on the wax mold, harden the shell and dry it; Then the internal wax mold melts away, is to dewax, obtain the cavity; Calcined shell to obtain sufficient strength and breathability; Metal materials required for pouring; The sand is removed after husking to obtain a high precision finished product. Heat treatment and cold processing according to product needs.