Foam molding machine system knowledge

Foam molding machine system was totally independent intellectual foam molding machine, not interfere with the mechanical adjustment. Die and mould such as motion must be accurate and efficient. Usually adopt speed distribution curve, in order to ensure accurate near moving parts. Maintain contact force can be adjusted. So can conclude that, without considering the energy consumption and mechanical reliability, additional conditions, such as mold quality under the premise of same quality mainly depends on the control screw forward movement phase of the system. In hydraulic injection molding machine, the adjustment by detecting hydraulic and implementation. Specifically, through the control panel and activate a set of hydraulic valve, fluid produced by manipulator, and adjust and release. Injection speed control including open loop control, half closed loop control and closed loop control and other options. Relying on the share proportion valve open loop system. Proportion of tension on the required proportion of fluid, so that the fluid pressure in the injection machine barrel, let the injection screw to the forward speed. A half closed loop system using closed loop proportional valve.

Closed loop in the closed position closed mouth, mouth by moving inside the valve and control oil flow rate. Closed-loop system is closed when the screw speed of translation. In the closed-loop system using speed sensor (usually a potentiometer type), timing detection tension decline. Proportional valve flow of oil through the adjustment, speed deviation can be compensated. Closed-loop control relies on a body specialized electronic components and machine integration. Closed loop pressure control during the injection and holding phase to ensure uniform pressure, and ensure the back pressure evenly in each cycle. By detecting the pressure value of proportional valve adjustment, compensate the deviation according to the set pressure value. In general, can be to monitor hydraulic pressure, however, detect nozzle or melt in cavity pressure is another effective method. More reliable solution is by reading the note mouth or cavity pressure readings to supervise and control the proportional valve. Detection on the basis of the pressure increase temperature detection, especially for process management. Understand the actual material can withstand the pressure, but also help according to the set pressure and temperature conditions to predict the actual weight and size of molding parts. In fact, by changing the holding pressure value, can be more material into cavity, in order to reduce parts contraction, comply with the design of tolerance (including the default injection molding shrinkage). Close to the melting condition, semi crystalline polymer shows great volume changes.