It is mainly a molding die, which is widely used to produce thermoplastic parts. The processing equipment corresponding to the plastic injection mold is a plastic injection molding machine. The plastic is first heated and melted in the heating cylinder at the bottom of the injection machine, and then enters the mold cavity through the nozzle of the injection machine and the gating system of the mold under the push of the screw or plunger of the injection machine. The plastic is cooled, hardened and shaped, and then demoulded to obtain the product. Its structure usually consists of molding part, pouring system, guiding part, pushing mechanism, temperature control system, exhaust system, supporting part and so on. The manufacturing materials are usually plastic die steel modules, and the commonly used materials are mainly carbon structural steel, carbon tool steel, alloy tool steel and high speed steel. Injection molding is usually only suitable for producing thermoplastic products. Injection molding produces a wide range of plastic products, from daily necessities to various complex machinery, electrical appliances, vehicle parts and so on. It is the most widely used processing method in plastic products production.

2, plastic die:

Include compression molding and injection molding. They are mainly used for molding thermosetting plastics, and the corresponding equipment is pressure molding machine. According to the characteristics of plastic, the compression molding method heats the mold to the molding temperature (generally 103- 108), then puts the measured compression molding powder into the mold cavity and feeding chamber, closes the mold, and the plastic becomes soft and sticky under the action of high temperature and high pressure, and after a certain period of time, it is solidified and molded into the required product shape. The difference between pressure injection molding and compression molding is that there is a separate feeding chamber. Before molding, the mold is closed and the plastic is preheated to a viscous state in the feeding chamber. Under the action of pressure, it is adjusted and extruded into the mold cavity and hardened. The die is also used to shape some special thermoplastics, such as hard-to-melt thermoplastics (such as polyvinyl fluoride) blanks (cold-press molding), resin lenses with high optical properties, and micro-foamed nitrocellulose steering wheels. The die is mainly composed of cavity, feeding cavity, guiding mechanism, ejecting parts and heating system. Injection molds are widely used to package electronic components. The materials used to manufacture the compression mold are basically the same as those used in the injection mold.