When it comes to cars, the first thing people think of is the car body, which means that the car body is the identity of the car. The body represents the image of the car. Therefore, Automotive mold, in a narrow sense, is the general term for the dies for stamping all stamping parts on the car body, that is, "automobile body stamping dies", such as top cover flanging dies, beam reinforcement dies, and so on.

　　But broadly speaking, "Automotive mold" is the general term for the molds used to manufacture all parts of automobiles, such as injection molds, stamping molds, forging molds, wax casting molds, glass molds, etc.

　　There are many classification methods for automotive plastic molds. According to the different molding methods, it can be divided into the following categories:

　　1. Injection mold

　　The characteristic of the molding process of the injection mold is that the plastic raw materials are placed in the heating barrel of the injection molding machine, and the plastic is heated and melted. Driven by the screw or plunger of the injection molding machine, it enters the cavity through the nozzle and the injection system of the mold, and the plastic is in the cavity. It is formed by pressing, cooling, and solidifying.

　　Since the heating and pressing device can function in stages, injection molding can not only form plastic parts with complex shapes but also has high production efficiency and good quality. Therefore, injection molding occupies a large proportion in the molding of plastic parts, and injection molds account for more than half of plastic molding molds. Injection molding machines are mainly used for the molding of thermoplastics, and in recent years have gradually been used for the molding of thermoset plastics.

　　2. Compression method

　　The characteristic of the molding process of the compression mold is that the plastic raw materials are directly added to the open mold cavity, and then the mold is closed. The plastic is melted under the action of heat and pressure, and then the cavity is filled with a certain pressure. At this time, the molecular structure of the plastic produces a chemical cross-linking reaction that gradually hardens and solidifies. Compression molds are mostly used for thermosetting plastics, and their molded plastic parts are mostly used for housings of electrical switches and daily necessities.

　　3. Transmission method

　　The transfer mold is also called injection mold or extrusion mold, which is characterized by adding plastic raw materials into the preheated feeding chamber and then applying pressure to the plastic material in the feeding chamber through a pressure column, and the plastic is melted under high temperature and high pressure. And enter the cavity through the gating system of the mold, and then undergo a chemical cross-linking reaction, and gradually solidify and shape. The transfer molding process is mostly used for thermoset plastics, which can form plastic parts with more complex shapes.

　　4. Extrusion die

　　The extrusion die can continuously produce plastics with the same cross-sectional shape, such as plastic pipes, rods, and sheets. The heating and pressing device of the extruder is the same as that of the injection machine. The molten plastic passes through the machine head to form continuously molded parts, which is extremely efficient.

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