Renovation of injection molding machines can reduce the production cost of injection molded products

The injection molding process of the injection molding machine is a cyclical process starting from the clamping action. In this periodic process, the hydraulic system must complete a series of actions: clamping, mold opening, overall movement of the injection seat, pressure holding and ejection of the product. .

The main working parameters of the injection molding machine that are closely related to the hydraulic system in one working cycle are injection pressure, injection rate, clamping force, holding pressure and so on. The injection pressure is an important factor in overcoming the flow resistance of the molten material flowing through the nozzle, the flow channel and the mold cavity, ensuring the filling stability and ensuring the accuracy and yield of the injection molded product. When the screw diameter is constant, the injection pressure is determined by the hydraulic system. The injection rate is a parameter that characterizes how quickly the melt fills the mold cavity. It directly affects the quality and productivity of the product, and its size is controlled by the flow rate of the working oil in the injection cylinder. The clamping force is the maximum clamping force that can be applied to the mold by the clamping mechanism of the injection molding machine. Together with the injection volume, it becomes the parameter of the nominal injection molding machine. For the hydraulic-bend-type clamping device, the clamping force is determined by the hydraulic pressure. The system and the toggle mechanism are jointly determined; for a fully hydraulic clamping device, the clamping force is determined by the hydraulic system of the injection molding machine.

The holding pressure is one of the important injection molding process parameters. The choice of holding pressure and holding time directly affects the quality of the injection molded product. The holding pressure is determined by the hydraulic system as 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 the pressure and speed required for each stage of the whole working cycle. The hydraulic system should have the characteristics of good working stability, high repeatability and sensitivity, low noise and energy saving. The hydraulic system is mainly composed of hydraulic pumps, valves, cylinders and circuits.

In 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, so the power consumed by the injection molding machine hydraulic system should also be changed with the working flow and working pressure. And constantly changing.