The more common approach is: first design and make a mold according to product requirements (leaving a very small or no margin), cast wax by casting method, and obtain the original wax model; repeat coating and sanding on the wax model The process includes hardening and drying the mold shell; then melting the internal wax mold to dewax and obtain the mold cavity; baking the mold shell to obtain sufficient strength; pouring the required metal materials; cleaning the sand after shelling to obtain the mold cavity. High-precision finished product. Heat treatment and cold processing may be performed according to product needs.