Automobiles are increasingly demanding the production o […]
Automobiles are increasingly demanding the production of plastic parts. The acceleration of automobile development and the continuous reduction of costs have forced automobile plastic parts manufacturers to continuously develop and adopt new production processes. Injection molding is the most important technology in the production of automotive plastic parts.
Due to the uniqueness of plastic parts for complex automotive parts, the following factors need to be fully considered when using plastic injection molds: drying of materials, new requirements for screws from glass fiber reinforced materials, drive forms and mold clamping structures, etc.
First of all, when the commonly used plastic materials such as car bumpers and dashboards are modified materials such as modified PP and ABS. Plastic materials have different hygroscopic properties. The raw materials must be dried or dehumidified with hot air before entering the screw preform of the injection molding machine.
Second, the current domestic automotive plastic parts are basically non-glass fiber reinforced plastic products. Compared with glass fiber reinforced resin, the material and structure of the injection molding machine screw used for molding non-glass fiber reinforced plastic parts are very different. Pay attention to the alloy material and special heat treatment process of the screw barrel while injecting and molding automobile plastic during operation to ensure its corrosion resistance and strength.
Third, because auto parts are different from traditional products, the surface of the cavity is very complicated, the stress is uneven, and the stress distribution is uneven. It is necessary to consider the processing capacity when designing the mold. The processing capability of the injection molding machine is reflected in the clamping force and injection molding capability. When the injection molding machine is molding a product, the clamping force of the mold must be greater than the opening force generated by the pressure of the injection mold cavity, otherwise the parting surface of the injection mold will separate and produce flashes.
To ensure reliable clamping of the mold, the clamping force during the injection molding process must be less than the rated clamping force of the injection molding machine. The maximum theoretical injection volume of the injection molding machine matches the tonnage of the injection molding machine.