(1) In the process of mold closing, the pressure oil in the cylinder pushes the action of the mold locking mechanism, and the moving template moves to make the mold close. Among them, the mold is first closed at low pressure and high speed; When the moving template is close to the fixed template, switch to low speed and low pressure closure (i.e., die protection condition); When it is confirmed that there is no foreign body in the mold, switch to high pressure (die locking force) and lock the mold tightly.
(2) After the mold is locked with the locking force during the shooting process of the injection device, the injection device will make the nozzle and the mold fit in the working condition. After the injection solenoid valve is energized, the injection cylinder is filled with pressure oil, the screw connected with the piston rod of the oil cylinder is pushed, and the molten material in the cylinder is injected into the locked mold cavity according to the graded pressure and speed.
(3) The screw is required to keep a certain pressure on the molten material during the filling of the die cavity until the filling is full, so as to prevent the molten material from backflow in the die; At the same time, the pressure holding pressure is applied in order to supplement the materials needed for cooling and shrinkage of the products to the mold cavity, so as to avoid shrinkage and other defects of the plastic products.
(4) Once the gate is sealed in the cooling and premolding process, the pressure retaining process is canceled and the products are cooled and shaped naturally in the mold; At the same time, a pre-plasticized oil motor is driven to turn the screw and transfer the granular plastic from the hopper forward for plasticizing. After the plasticization of the raw material reaches the predetermined measurement value, in order to prevent the melted plastic from overflowing the nozzle, it is necessary to move the screw back a certain distance, that is, to carry out anti-delay treatment.
(5) After the pre-plastic measurement and anti-delay process of injection device retreat, mold opening and plastic product ejection, in order to prevent the nozzle from forming cold material due to long-term contact with cold mold, it is usually necessary to remove the nozzle from the mold, that is, enter the retreat condition of injection device. Whether the action is performed, and the sequence of execution, can be selected. Once the product is cooled and shaped, the mold is opened and the product is ejected.
The above is a small series for you to introduce the basic process of the injection molding machine, understand it can make you more skilled in the operation of the injection molding machine.
