How do injection molding machines control mold opening and closing

    Mold opening control of injection molding machine: molten plastic is injected into the mold cavity until cooling is completed, the mold is opened and the product is pulled out. The opening process is also divided into three stages. The first stage opens slowly to prevent the product from tearing in the mold.

    The second stage is to open quickly and shorten the opening time. The third stage reduces the impact and vibration caused by opening inertia through slow opening.

    Mold closing control of injection molding machine:

    The clamp is a huge mechanical thrust to tighten the mold to prevent the melted plastic from high-pressure injection and charging the mold in the injection molding process, so as to create a huge opening force of the mold.

    After closing the safety door, each travel switch sends a signal and the clamping action starts immediately. First, move the template, start at a slower speed, move forward for a short distance, and then press the original slow switch to separate the lever pressure block to make the movable plate rotate forward quickly. When approaching the end of the fixture, the pressure bar at the other end of the lever presses the slow switch. At this time, the movable plate rotates slowly again to advance at low pressure.

    In the process of low-pressure clamping, if there are no obstacles between the molds, you can close it gently with the high-voltage switch. Rotating the high-voltage is to straighten the machine hinge and complete the clamping action. This distance is very short, usually only 0.3 ~ 1.0mm. As soon as the high voltage is rotated, it reaches the clamping end limit switch. At this time, the action stops and the mold closing process ends.

    The clamping structure of the machine is fully hydraulic and machine connected. No matter what type of structure, the connecting rod will be completely straightened and the joint main force will be implemented. The process of connecting rod straightening is the process of opening the movable plate and tail plate, and the process of increasing the force on the four levers.

    The clamping force can know the Zui high value that can rise on the hydraulic meter at the moment of tightening the clamping force. If the clamping force is large, the Zui high value of the hydraulic system will increase, and vice versa. The small injection molding machine does not have a clamping hydraulic gauge, so it is necessary to judge whether the mold is really tightened according to the straightening of the connecting rod.

    When a machine closes the mold, if the connecting rod cannot be easily straightened, "almost" straightened, or one of several pairs of connecting rods cannot be completely straightened, the expansion mold will appear during injection molding, and flash or other problems will appear in the production.