In 1868 John Wesley Hyatt became the first to inject hot celluloid into a mold, producing billiard balls. From now on, a new industry that name called mold was born. Many years before. The mold bcame very important in our life. Plastic injection molding is an important method, which is primarily applicable to thermoplastic plastic molding, Molding can be a complex shape of precision plastic parts. But how to produce the plastic product more effective, more quick and more economical has become a new topic. This design mainly introduces the main design process of the injecting mold. First plastic product is analyzed, including its material and shape size and so on. Then injection machine is chosen, as well as the mold concrete design, including several important parts: the number of the cavity, the dividing face, designing of the injecting system, cooling system, air supplement and platoon overflows system, the outing mechanism, the mechanism for taking out the core and so on. Its concrete size, shape and form design and the analysis of its performance are also carried on, especially analysis of designs of some important functional parts in this design. deciding of the face, noting system ,taking out the organization of core and the outing organizationsand sprinkling at the same time,cooling system and so on .In addition, return to design of plastics injected other zero parts of mold to carry on the simple design.
Key words: Cooling system ;Pouring system ;Plastic products;Plastic mold