2023.05.19
The processing process of the foam molding machine can be integrated into: mold closing→filling→back discharge→mold preheating→heating→precooling→cooling→mold opening→exiting the product and other sequential actions. Among them, the mold closing, mold opening, etc. are judged by the travel switch whether the action is completed; heating is to make the material filled in the mold foam, expand, and form, so there must be a certain duration, and the product can be withdrawn by air pressure or hydraulic pressure. The method is to eject the products in the mold, and each process can be controlled by time. The required time can be set or adjusted by the operator on the spot according to the process requirements through the dial or switch on the panel.
Repair of main parts of injection foam molding machine
injection equipment
There are many types of plasticizing injection equipment for injection foam molding machines, but plasticizing with a screw is what they have in common. Different types of foam injection molding machines have different functions and structures of the screws. Some screws only have the function of plasticizing, and their operation can be continuous or intermittent; some screws have plasticizing and pressure injection functions. Two-layer function, the screw operation can only be intermittent; the selection of physical foaming agent and the selection of chemical foaming agent have different requirements for the screw structure. When using chemical foaming, the chemical foaming agent is usually mixed with other raw material components before they are added to the plasticizing barrel for plasticization. When using physical foaming, the foaming agent is often injected directly from the front of the barrel. in the plastic melt. For this reason, the screw should not only have a special structure in the injection section, but also should be equipped with mixing elements to fully mix the blowing agent with the plastic melt.
nozzle
The nozzle of the injection foam molding machine should meet the following special requirements. The nozzle can be controlled to open and close and minimize the resistance to movement. Generally, individually controlled locking nozzles are used. In order to reduce the accumulation of material, it is more appropriate to use needle valve locking nozzles. Some nozzles also have a mixing function. In short, there are various types of nozzle structures, which have obvious effects on the quality of foamed products. Influence.
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