(1) Mold clamping process
The pressure oil in the mold clamping cylinder promotes the action of the clamping mechanism, and the movable template moves to close the mold. Among them, the mold is first closed at low pressure and high speed; when the moving template is close to the fixed template, it is switched to low speed and low pressure (that is, the mold protection conditions); when it is confirmed that no foreign matter exists in the mold, it is switched to high pressure (mold clamping Force), and lock the mold.
(2) Injection device
After the mold is locked with the clamping force during the injection process, the injection device enters the working condition to make the nozzle and the mold fit. After the injection solenoid valve is energized, the injection cylinder is filled with pressure oil, the screw connected to the piston rod of the cylinder is pushed, and the melt in the barrel is injected into the locked mold cavity according to the graded pressure and speed.
(3) Holding process
In the process of filling the cavity of the molten material until the filling is completed, the screw is required to maintain a certain pressure on the molten material to prevent the molten material in the mold from flowing back. At the same time, a holding pressure is applied to supplement the product's cooling shrinkage into the cavity. Required materials to avoid defects such as shrinkage of plastic products.
(4) Cooling and pre-plasticizing process
Once the gate is sealed, the pressure-holding process is cancelled, and the product is naturally cooled and shaped in the mold; at the same time, the pre-plastic oil motor is driven to rotate the screw to convey the granular plastic from the hopper forward for plasticization. After the plasticization of the raw material reaches a predetermined metering value, in order to prevent the melted plastic from overflowing the nozzle, the screw needs to be moved backward a certain distance, that is, the anti-delay treatment is performed.
(5) Injection device Withdrawal, mold opening and ejection of plastic products
After the pre-plastic measurement and anti-rolling process is over, in order to prevent the nozzle from forming cold materials due to contact with the cold mold for a long time, it is usually necessary to withdraw the nozzle from the mold, that is, enter the injection device and retreat. Whether the action is performed and the sequence of execution can be selected. Once the product is cooled and shaped, open the mold and eject the product.