Die casting is the abbreviation of pressure casting. It is a method that liquid or semi-liquid metal fills the cavity of die casting mold at high speed under high pressure and solidifies under pressure to obtain castings. Precision casting is a special kind of casting. The parts obtained by this method generally do not need to be machined. Investment casting, also known as lost wax casting, is commonly used: selecting suitable investment materials (such as paraffin) to make investment molds; Repeat the steps of dipping refractory paint and spraying refractory sand on the investment mold, harden the mold shell and dry it. Precision casting: Precision casting is a special kind of casting. The parts obtained by this method generally do not need to be machined. Such as investment casting, pressure casting, etc. Precision casting is a casting method compared with traditional casting technology. It can obtain relatively accurate shape and high casting accuracy. The common practice is: first, according to the product requirements, design and manufacture a mold (with little or no allowance), and cast wax by casting to get the original wax mold; Repeat the processes of coating and sanding on the wax mold, hardening the mold shell and drying; Then melting and dewaxing the wax pattern inside to obtain a cavity; Bake the template to obtain sufficient strength; Pouring required metal materials; Sand cleaning after shelling to obtain high-precision finished products. Carry out heat treatment and cold working according to product requirements.