First, injection mold plays a crucial role in injection molding production, injection mold is a process of manufacturing products with a certain size and quality through the design of materials, shapes, sizes and motion trajectories. Injection mold is a type of molding parts by pressing plastic directly into the mold cavity. According to the type of injection molding machine, the injection mold can be divided into manual injection molding machine, semi-automatic injection molding machine and automatic injection molding machine. According to the injection mold material, the current common injection mold materials are the following: steel, cast iron and aluminum alloy. In addition, there are carbon fiber reinforced composite materials, epoxy resin (EP), polycarbonate (PC), etc., these materials can greatly improve the impact resistance of injection molds, but in some cases these materials will affect the production quality or reduce costs. It is important to choose a different injection mold according to the material used, because some materials may not work with the injection mold, resulting in some parts being damaged or unusable. The following is to introduce the role of injection mold in plastic production and its classification: 
1. The injection mold generally includes a cavity, a molding system and a machine, of which the main role of the molding system is to mix plastic particles and then form. For plastic products, their shape is determined by the nature of the plastic, production conditions and other factors. 2. In order to obtain good appearance quality, the cavity of the injection mold is generally relatively deep. 
3. The injection mold is the first plastic molding into parts, and then the parts are assembled into the mold, and finally installed on the injection molding machine.
4. Injection molding machine is composed of hydraulic system, electrical control system, hydraulic pump station and mechanical transmission device.
5. In the injection molding production process, in order to ensure product quality, it is necessary to use a certain degree of mold structure to ensure the required size and shape. The above is the most commonly used mold structure types in the plastic industry and the role and characteristics they play in injection molding production!
Second, injection mold according to the structural form can be divided into integral (such as large vertical injection molding machine), combined (such as small horizontal injection molding machine), combined (such as double station small horizontal injection molding machine) three kinds. Injection moulds are molds used to produce plastic products. It usually consists of a molding system, an injection molding machine, a demoulding system and a cavity system. Here, we will introduce several typical injection mold structures. Injection molding product structure refers to the product structure composed of which parts in the design process of injection molding machine. Plastic injection mold refers to a plastic part composed of which parts, usually including a plastic molding system; Core; Cooling system, etc. Among them, the performance of the injection mold depends to a large extent on the cavity structure, so the injection mold is also called the cavity. Third, according to the material classification injection mold is generally divided into steel and cast iron, etc., they have high strength and wear resistance, and aluminum alloy has good impact resistance, but not suitable for high temperature environment, so aluminum is a high temperature resistant material. In addition, the design and manufacture of molds also involve the melting and filling of plastics in the process of plastic processing. 4. According to the classification of materials, the basic materials commonly used in injection molds are steel, aluminum alloy and stainless steel. For steel, its advantages are strong corrosion resistance, good temperature resistance and cheap price, but it is difficult to process, and the forming part is easy to deform. For aluminum alloy, its advantages are high strength and good hardness, but high processing costs. Stainless steel has good corrosion resistance and surface gloss, but its disadvantage is that the processing is difficult and the cost is high.
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