During plastic injection molding, injection molding machine The control of injection speed and pressure is a key operating parameter, which has an important impact on the quality and performance of the final product. Let's have a deep understanding of the injection speed and pressure control method of the injection molding machine.
The injection speed of an injection molding machine refers to the injection rate of plastic materials before entering the mold. It directly affects the filling time and pressure distribution of plastics in the mold cavity. The control of injection speed needs to be adjusted according to the characteristics of specific products and plastic materials. The methods to control the injection speed mainly include the following:
1. Conventional control valve control: adjust the injection speed through the valve that controls the oil flow. This method is usually used for simple injection molding machines and has a relatively basic speed adjustment function.
2. Servo motor control: the injection system is driven by a servo motor, and the injection speed is controlled by adjusting the motor speed. This method has higher accuracy and response speed, and is suitable for injection molding process with high requirements.
3. Proportional valve control: use the proportional valve to control the flow of the hydraulic system to achieve accurate injection speed adjustment. The proportional valve controls the flow through the electromagnetic signal, so that the injection speed can be accurately adjusted and controlled.
The injection pressure of the injection molding machine refers to the pressure exerted on the mold during the plastic injection process. It affects the filling, compaction and cooling process of plastic materials, and is directly related to the density, quality and dimensional accuracy of products. The methods for controlling injection pressure mainly include the following:
1. Oil pressure control: adjust the injection pressure by controlling the oil pressure of the hydraulic system. By adjusting the oil supply rate and flow control valve, the injection pressure of the injection molding machine can be accurately controlled.
2. Pressure sensor feedback control: use the pressure sensor to measure the actual pressure in the injection molding process and feed it back to the control system. The control system adjusts the output of the hydraulic system according to the difference between the set value and the actual value to achieve accurate control of the injection pressure.
3. Closed loop control system: use a closed loop control system to monitor and adjust the injection pressure. The system automatically adjusts the output of the hydraulic system to maintain a stable injection pressure by constantly detecting the injection pressure and comparing it with the set value.
Lian Sheng Large injection molding machine To sum up, by reasonably controlling the injection speed and pressure of the injection molding machine, accurate control of the plastic injection process can be achieved to ensure the stability of product quality and performance. According to different products and production requirements, selecting appropriate control methods and parameters for real-time adjustment and optimization is a key step to improve the efficiency of injection molding process and product quality.
