Shanghai Lisong Machinery Co., Ltd.
injection molding machine


Composition and working principle of injection molding machine



The injection molding machine is a special equipment that combines the thermal processing characteristics of plastics and the principle of metal melting and die casting. 

The composition structure of the injection molding machine  
According to the requirements of the injection molding process, the injection molding machine is a model with strong mechatronics. It is mainly composed of injection parts, clamping parts, frame, hydraulic system, heating system, control system, and feeding device.  
At present, the common injection molding equipment has single cylinder type and double cylinder type.  
There are two types of plasticized parts: plunger type and screw type. In the continuous pushing process of the rotating screw, the plastic realizes the change of the physical state, and finally is in the molten state and injected into the mold cavity. Therefore, the plasticized component is the core component for uniform plasticization and quantitative injection.

The working principle of the injection molding machine  
Injection molding machine is abbreviated as injection molding machine. Injection molding uses the thermophysical properties of plastics to add materials from a hopper to a barrel. The outside of the barrel is heated by a heating ring to melt the material. The barrel is equipped with an external power motor to drive rotation. In the screw, the material is gradually plasticized, melted and homogenized under the double action of the screw shear. When the screw rotates, the material pushes the melted material to the screw head under the action of the friction force of the groove and the shear force. At the same time, the screw retreats under the reaction of the material, so that the head of the screw forms a storage space to complete the plasticization process. Then, under the inference of the injection cylinder piston, the screw passes the molten material in the storage chamber at high speed and high pressure. The nozzle is injected into the mold cavity. After the melt in the cavity is pressure-maintained, cooled, solidified and shaped, the mold is opened by the clamping mechanism, and the shaped product is lifted from the mold through the ejector device. Fall out.

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