The Design Research Of Hign-Speed Injection Hydraulic System

In recent years, with the rapid development of electronic information products, plastic products with thin-walled and complex structures are more and more demanded, and these molded articles are difficult to accomplish on a normal low-speed injection molding machine, high-speed injection molding is one of the key factors to mold thin-walled products. Based on this background, this paper combines ultra-thin light guide actual production to design a high-speed injection of hydraulic system, which can meet the speed requirements of molding ultra-thin light guide.The subject mainly researches the injection process of high-speed injection molding machine and proposes the double cascade injection device separating the plasticization and injection, based on current market, by comparing the different forms of plasticizing, injectable, drive. Because screw and piston can realize the function of sol plasticization and injection respectively, the contradiction between injection pressure and injection speed can well be solved. Drive mode adopts accumulator solutions with MOOG servo valve, which can meet high precision injection and injection control. In addition a high-speed hydraulic injection system is designed, and the components in the system are designed and calculated.Based on the hydraulic simulation software AMESim, the model of hydraulic system of high speed injection element and the system simulation are established respectively, and then simulation analysis is carried out on the high speed injection of hydraulic system with the corresponding parameter elements setted. System dynamic characteristics, especially the injection speed of response time are researched. The simulation results show injection speed can quickly response to the stable value and meet the design requirements.Finally, the high-speed injection molding machine is assembled in Ningbo L.K Ltd. After many times debugging and ultra-thin light guide actual injection molding experiments, experimental results show that ultra-thin light guide can be well molded at injection speed up 600mm/s. The feasibility of high-speed injection hydraulic system this paper designed is verified by comparing the simulation and actual injection speed.