the pressure oil in the clamping cylinder of the mold closing process drives the clamping mechanism to move, and the movable template moves to close the die. Firstly, the die is closed at low pressure and high speed; When the moving formwork is about to approach the fixed formwork, switch to low-speed and low-pressure closing (i.e. mold protection condition); When it is confirmed that there is no foreign matter in the mold, switch to high pressure (mold locking force) and lock the mold.
In the injection process of the injection device, after the mold is locked with the mold locking force, the injection device enters the working condition to make the nozzle fit with the mold. After the injection solenoid valve is energized, the injection cylinder is filled with pressure oil to push the screw connected with the piston rod of the cylinder, and the molten material in the barrel is injected into the locked mold cavity according to the graded pressure and speed.
In the pressure maintaining process, the screw is required to maintain a certain pressure on the melt during the filling process of the mold cavity until it is filled, so as to prevent the melt from flowing back in the mold; At the same time, the pressure maintaining pressure is applied to supplement the materials required for cooling and shrinkage of products to the mold cavity, so as to avoid defects such as shrinkage of plastic products.
In the process of cooling and pre molding, once the gate is sealed, the pressure maintaining process is cancelled, and the products are naturally cooled and shaped in the mold; At the same time, the pre plastic oil motor is driven to rotate the screw to transport the granular plastic from the hopper forward for plasticization. After the plasticization of raw materials reaches the predetermined measurement value, in order to prevent the melted plastic from overflowing the nozzle, it is necessary to move the screw backward for a certain distance, that is, anti delay treatment.
After the end of the injection device withdrawal, mold opening and plastic product ejection process, pre plastic metering and anti delay process, in order to prevent the nozzle from forming cold material due to long-time contact with the cold mold, it is usually necessary to withdraw the nozzle from the mold, that is, enter the injection device withdrawal working condition. You can choose whether to execute the action and the sequence of execution. Once the product is cooled and shaped, the mold is opened and the product is ejected.
