Working principle and operation of plastic injection molding machine
Plastic injection molding machine is a technological process in which the plastic in the melted state (i.e. viscous flow state) is injected into the closed mold cavity with the help of the thrust of screw (or plunger), and the product is obtained after solidification and finalization. Injection molding is a cycle process, each cycle mainly includes: quantitative feeding - melting and plasticizing - pressure injection - mold filling and cooling - mold opening and taking. Take out the plastic part and then close the mold for the next cycle.
Mold locking: when the mold plate is close to the fixed mold plate quickly and there is no foreign matter, the system turns to high pressure and locks the model.
Shooting table moves forward in place: the shooting table moves forward to the designated position.
Plastic injection molding: the screw can be set with multi-stage speed, pressure and stroke to inject the dissolved material at the front end of the barrel into the mold cavity.
Cooling and pressure maintaining: maintain the pressure of the barrel according to the set pressure and time period, and cool the mold cavity for molding at the same time.
Cooling and pre molding: the products in the mold cavity continue to cool, at the same time, the hydraulic motor drives the screw to rotate to push forward the plastic particles, and the screw moves backward under the set back pressure control. When the screw moves backward to the predetermined position, the screw stops rotating, and the injection cylinder loosens as set, and the end is expected.
Ejection stage backward: after the pre molding, ejection stage backward to the designated position.
Mold opening: pull the die back to the original position.
