The injection mold consists of a moving mold and a fixed mold. The moving die is installed on the moving die plate of the injection molding machine, and the fixed die is installed on the fixed die plate of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated, and the plastic product is taken out.

Injection mold can be divided into thermosetting plastic mold and thermoplastic plastic mold according to molding characteristics. According to the molding process, it can be divided into plastic transfer mold, blow mold, casting mold, hot forming mold, hot pressing mold (compression mold), injection mold and so on. Among them, hot pressing mold can be divided into overflow type, semi-overflow type and non-overflow type, and injection mold can be divided into cold runner mold and hot runner mold according to gating system. According to the way of loading and unloading, it can be divided into two types: mobile and fixed.

Injection mold is a tool for producing plastic products; It is also a tool to give plastic products complete structure and precise size. Injection molding is a processing method for mass production of some parts with complex shapes. Specifically, the heated and melted plastic is injected into the mold cavity from the injection molding machine under high pressure, and after cooling and curing, the molded product is obtained.

Although the structure of the mold may be ever-changing due to the variety and performance of plastics, the shape and structure of plastic products and the types of injection molding machines, the basic structure is the same. The mold is mainly composed of gating system, temperature control system, molding parts and structural parts. Among them, the gating system and molding parts are the parts that are in direct contact with plastics and change with plastics and products, and they are the most complicated and changeable parts in plastic molds, which require the highest machining smoothness and accuracy.

The gating system refers to the part of the runner before the plastic enters the cavity from the nozzle, including the main runner, the cold material hole, the shunt runner and the gate. Molded parts refer to all kinds of parts that constitute the shape of products, including moving dies, fixed dies and cavities, cores, forming rods, exhaust ports, etc. Typical plastic mold structure.