| In recent years,with the rapid development of the electronic of the electronic information industry,the demand of plastic products with complex structures,thin thicknesses and light weights has increased dramatically.However,such products are difficult to complete through ordinary injection molding,and the main factor restricting their molding is high Injection speed.At present,the mainstream injection molding machine on the market is still a full hydraulic injection molding machine.Although most hydraulic high-speed injection molding machines use accumulators to achieve high injection speeds,the dynamic response of the accumulator parameters and hydraulic system component parameters to the injection speed The degree of influence is unknown.At the same time,due to the increase in injection speed,the conventional PID control cannot meet the precise control of the injection speed,which is not conducive to the improvement of the surface quality of the product.In view of the shortcomings of the research on the hydraulic high-speed injection molding machine,this subject is based on the high-speed injection hydraulic system of the accumulator and the double pump,and the simulation model of the high-speed injection hydraulic system is constructed,and on the basis of this,the feasibility of realizing the high-speed injection molding is verified.The effects of accumulator parameters and hydraulic pipeline parameters on high-speed injection molding were studied.At the same time,MATLB was used to build a high-speed injection speed simulation model to analyze and explore the dynamic and steady-state tracking performance of different control schemes for injection speed.The main research contents of this article are as follows:(1)A high-speed injection hydraulic system simulation model is constructed.The technical principles related to high-speed injection are expounded,the accumulator+dual-pump high-speed injection hydraulic system is designed,and the simulation model of each component is established to analyze the effect of the accumulator combination on the speed and response time.The results show that:multiple energy storage When the devices are connected in series,the effect is better than other forms,and the pressure drop characteristics and flow characteristics are consistent.It provides a theoretical basis for hydraulic system design using multiple accumulators in series instead of a single accumulator.(2)The influence of component parameters on high-speed injection speed and response time was explored.Based on the simulation model of high-speed injection hydraulic system,study the influence of accumulator,pipeline,gain,solenoid valve current,etc.on injection speed and response time,and then use orthogonal experiments to explore the degree of influence of each experimental factor on the experimental index The results show that the volume of the accumulator has a significant effect on the injection speed,and the length of the pipeline has a greater influence on the response time,which provides a theoretical reference for the hydraulic system to achieve high-speed injection and rapid response.(3)The effect of different control methods on the response of injection speed was explored.The related control technology principles are elaborated,different control algorithms are designed,speed simulation models of different control algorithms are established,and the dynamic and steady-state tracking performance of different control schemes on speed is analyzed.The analysis results show that the fuzzy adaptive PID control algorithm has a good control effect on the speed dynamic,steady-state tracking and response time,and provides a method for the injection speed control. |
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