Pre-moderation considerations

- Apr 17, 2018-

1. To understand the relevant information of the mold: It is best to obtain the design surface of the mold, analyze it in detail, and get the mold technician to participate in the mold test work. 2. First check its mechanical cooperation on the workbench:         Pay attention to whether there are scratches, missing parts, and looseness. Check if the die plate movement is correct and whether there are any leaks in the water pipe and air pipe joints. If there is a limit to the die opening, it should be marked on the die. If the above action can be done before hanging the mold, it can avoid the problems found when hanging the mold, and then the man-hour waste that occurs when the mold is removed. 3. When it is determined that the various parts of the mold are properly moved, the appropriate injection molding machine should be selected. When selecting the mold, attention should be paid to:         (a) What is the maximum injection volume of injection molding machines?         (b) Whether the distance between levers is the lower mold         (c) Whether the maximum movement schedule of the activity template meets the requirements         (d) Whether or not other related tools and accessories for trial moulding are ready

          After confirming that there is no problem, the next step is to hang the mold. When hanging, care should be taken not to remove the hook before locking all the clamp plates and opening the mold to prevent the clamp plate from loosening or breaking so that the mold will fall. After the mold is installed, the mechanical actions of each part of the mold should be carefully checked, such as whether the movements of the slide plate, the ejector pin, the retraction mechanism, and the limit switch are correct. Pay attention to whether the shooting nozzle and the feed port are aligned. The next step is to pay attention to the mold clamping action. At this time, the mold closing pressure should be lowered. Attention should be paid to seeing and listening to any phenomenon such as whether it is smooth or unnatural. The process of lifting the mold is actually quite simple. The main thing to be careful is that the mold gate and the center of the nozzle are more difficult. Usually, the center can be adjusted by means of a test strip. 4. Improve mold temperature:           Based on the properties of the raw materials used in the finished product and the size of the mold, an appropriate mold temperature controller is used to increase the temperature of the mold to the temperature required for production. After the mold temperature increases, the movement of each part must be checked again. Since the steel may cause a die phenomenon after thermal expansion, attention must be paid to the sliding of each part to prevent the occurrence of strain and chatter. 5. If the factory does not implement experimental planning rules, we suggest that only one condition can be adjusted at a time in order to adjust the test conditions so as to distinguish the effect of a single condition change on the finished product.

6. According to different raw materials, moderate baking is performed on the raw materials used. 7. Try to use the same raw materials as possible for future production. 8. Do not try the mold completely with a second material. If there is a color requirement, try the color together. 9. Internal stress and other problems often affect the secondary processing. After the mold is to be tested, after the mold is stabilized, the secondary mold is closed at a slow speed. After the mold is closed at a slow speed, the mold closing pressure must be adjusted and the tube must be moved several times to check if there is any contact. Mold pressure is not uniform, so as to avoid burrs and mold distortion.            After the above steps are checked, the mold closing speed and the mold closing pressure are lowered, and the safety buckle and the ejection stroke are set, and then the normal closing mold and the closing mold speed are adjusted. If the limit switch is involved in the maximum stroke, the mold opening stroke should be adjusted slightly, and the high-speed mold opening action should be cut before the maximum stroke of this mold opening. This is because during the entire mold opening stroke during the mold loading, the high-speed stroke is longer than the low-speed stroke. The mechanical ejector rod on the plastic machine must also be adjusted after the full-speed mold-opening action so as to avoid deformation of the ejector pin or stripper plate by force.