2022-03-18
The working principle of the vertical horizontal injection molding machine is similar to that of the injection syringe. It is to inject the molten plastic that is plasticized by the thrust of the screw (or plunger) into a closed mold cavity, and then solidify and fix the mold. The process of the product.
Injection molding is a cyclic process, each cycle mainly includes quantitative feeding-melt plasticization-pressurized injection molding-filling and cooling-demolding parts. After taking out the molded product, close the mold and proceed to the next cycle.
Injection molding machine operation items: Injection molding machine operation items include keyboard operation, electrical control system operation and hydraulic system operation. Carry out the injection process action, filling action, injection pressure, injection speed, ejector type selection, temperature monitoring of each section of the oil cylinder, injection pressure and back pressure adjustment, etc.
The molding process of a general screw injection molding machine is to first put granular or powdered plastic into the barrel, turn the screw and heat the outer wall of the barrel to make the plastic into a molten state, and then use the machine to close the mold and inject it. The seat advances, the nozzle is tightly attached to the gate of the mold, and then the injection series is maintained under a certain time and pressure (also called pressure holding). After cooling and solidification, the mold can be opened and the product can be taken out. The purpose of pressure holding is to prevent The melt in the cavity flows backwards to supplement the material in the cavity to ensure that the product has a certain density and dimensional tolerance). The basic requirements of injection molding are plasticization, injection molding, and molding.
Plasticization is the prerequisite for realizing and ensuring the quality of forming, but in order to meet the requirements of forming, it is necessary to ensure that the injection molding has sufficient pressure and speed. In addition, due to the higher injection pressure, higher pressure will be generated in the cavity, so the average pressure in the cavity is usually between 20~45MPa, and sufficient clamping force is required. It can be seen that the injection device and the clamping device are important parts of the injection molding machine.
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