The injection unit comprises key components such as the screw, barrel, nozzle, hopper, metering device, transmission device, injection unit, and moving hydraulic cylinder, which work together to complete the injection molding of plastic. The mold clamping device is unique to two-platen injection molding machines. It consists of front/rear fixed platens, moving platens, gateposts (or tie rods), mold clamping hydraulic cylinders, mold moving hydraulic cylinders, mold locking mechanism, mold adjusting device, and product ejection device. These components work together to ensure the precision and efficiency of the injection molding process.
Two-platen injection molding machines use a direct pressure working method, where four high-pressure mold locking hydraulic cylinders work together to pull the gateposts, applying and maintaining pressure on the mold. The process of producing plastic parts includes multiple steps: slow mold clamping, fast mold clamping, low-pressure slow mold clamping, rotating nut locking, high-pressure mold locking hydraulic cylinder locking, injection, pressure holding, pressure release after holding, high-pressure mold opening, nut loosening, slow mold opening, high-speed mold opening, slow mold opening again, product ejection, and ejector pin retraction. These steps form a complete and compact injection molding process.
