In recent years, some small and medium-sized injection molding production enterprises in the Pearl River Delta region have used inverter technology to carry out energy-saving reforms on the hydraulic system of injection molding machines, which has greatly reduced the power consumption in injection molding production, thereby significantly reducing the production of injection molding products. The cost brings considerable economic benefits to the company.
Work cycle The injection molding machine injection molding process is a cyclical process that starts from the closing action. In this cyclical process the hydraulic system must complete a series of actions: closing the mold, opening the mold, moving the entire seat, maintaining the pressure and ejecting Products and so on.
Working parameters The main operating parameters of the injection molding machine that are closely related to the hydraulic system during a work cycle are injection pressure, injection rate, clamping force, and pressure holding pressure. Injection pressure is an important factor to overcome the flow resistance of molten material flowing through nozzles, runners, and mold cavities, to ensure mold stability, and to ensure accuracy and yield of injection molded products. When the screw diameter is constant, the size of the injection pressure is determined by the hydraulic system. The injection rate is a parameter that characterizes the speed at which the melt fills the mold cavity. It directly affects the quality and productivity of the product, the size of which is controlled by the flow of working oil from the injection cylinder. The clamping force is the maximum clamping force that can be applied to the mold by the mold clamping mechanism of the injection molding machine. Together with the injection volume, it becomes the parameter of the nominal injection molding machine specification. For the hydraulic-toggle-type mold clamping device, the clamping force is controlled by the hydraulic pressure. The system and the toggle mechanism jointly determine; for the full hydraulic clamping device, the size of the clamping force is determined by the hydraulic system of the injection molding machine.
Holding pressure is one of the important parameters of injection molding process. The choice of holding pressure and holding pressure time directly affects the quality of injection products. The pressure of holding pressure is determined by the hydraulic system just like the injection pressure. The hydraulic system of the injection molding machine hydraulic system is an important part of the injection molding machine. It must meet the different requirements of pressure and speed required at all stages of the work cycle. The hydraulic system should have features such as good work stability, high repeatability and sensitivity, low noise, and energy saving. The hydraulic system is mainly composed of hydraulic pumps, valves, cylinders and circuits.
In the injection molding production, according to the needs of the injection molding process, the working flow and working pressure provided by the hydraulic system to the injection molding machine should be constantly changing. Therefore, the power consumed by the hydraulic system of the injection molding machine should also change with the working flow and working pressure. And constantly changing.