【文章內(nèi)容簡(jiǎn)介】 response capacity and speed. Injection Mold consists of a number of plate which mass with the various ponent parts. It divided into: A molding device (Die, punch)B positioning system (I. column I. sets) C fixtures (the word board, codepit) D cooling system (carrying water hole) E thermostat system (heating tubes, the hotline) FRoad System (jack Tsui hole, flow slot, streaming Road Hole) G ejection system (Dingzhen, top stick). Type of mold It can be divided into three categories according to gating system with the different type of mold :(1) intake die: Runner and gate at the partig line,it will strip together with products when in the open mode,it is the most simple of design, easy processing and lower more people operations by using large intake system. (2) small inlet die:It general stay in the products directly,but runner and gate are not at the partig ,it should be design a multioutlet parting then it is more plex in the designing, more difficult in processing, generally chosing the small inlet die is depending on the product’s requirements. (3) hot runner die:It consists of heat gate, heat runner plate, temperature control box. Hot runner molds are two plate molds with a heated runner system inside one half of the mold. A hot runner system is divided into two parts: the manifold and the drops. The manifold has channels that convey the plastic on a single plane, parallel to the parting line, to a point above the cavity. The drops, situated perpendicular to the manifold, convey the plastic from the manifold to the part. The advantages of hot runner system ： (1)No outlet expected, no need processing, the whole process fully automated, save time and enhance the efficiency of the work. (2) small pressure loss. Injection Mold There are many rules for designing rules and standard practices are based on logic,past experience,convenience,and designing,mold making,and molding,it is usually of advantage to follow the occasionally,it may work out better if a rule is ignored and an alternative way is some texts,the most mon rules are noted,but the designer will learn only from experience which way to designer must ever be open to new ideas and methods,to new molding and mold material that may affect these process consists of feeding a plastic pound in powdered or granular form 7 from a hopper through metering and melting stages and then injecting it into a molding process: Mold is a production of plastic tool. It consists of several parts and this group contains forming cavities. When it injects molding, mold clamping in the injection molding machine, melting plastic is Injected forming cavities and cooling stereotypes in it, then it separate upper and lower die,it will push the production from the cavity in order to leave the mold through ejection system, finally mold close again and prepared the next injection. The entire process of injection is carried out of the cycle. An injection mold consists of at least two halves that are fastened to the two platens of the injection molding machine so that can be opened and the closed position,the productforming surfaces of the two mold halves define the mold cavity into which the plastic melt is injected via the runner system and the provisions in the mold provide for cooling and solidification of the molded product so that it can be subsequently ejected. For product ejection to occur,the mold must shape of the molded product determines whether it can be ejected simply by opening the two mold halves or whether undercuts must be design of a mold is dictated primarily by the shape of the product to be molded and the provisions necessary for product products can be classified as: 1).Products without undercuts. 2).products with external undercuts of lateral openings. 3).products with internal undercuts. 4).products with external and internal undercuts. position of injection mold Mold Cavity Space Th