Injection molding molds are devices that heat and melt resin materials and then inject them into the molds. As shown in the figure, the resin is squeezed into the barrel from the material head. The Dongguan mold Factory conveys the melt to the front end of the barrel through the rotation of the screw. During that process, the resin material in the barrel is heated under the action of the heater. Under the shear stress of the screw, the resin becomes molten, and the molten resin equivalent to the molded product and the main runner and runner is retained at the front end of the barrel. The continuous forward movement of the screw injects the material into the mold cavity. When the molten resin flows inside the plastic mold in Dongguan, the moving speed of the screw must be controlled, and after the resin fills the mold cavity, it should be controlled by pressure. When the screw position and injection pressure reach a certain value, we can switch the speed control to pressure control.