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Special attention should be paid to these issues in injection mold maintenance
by：Vowin Rapid Prototyping
2023-02-07
After the injection mold has been used for a long time or has not been used for a long time, it is easy to have some small problems of this kind. These small problems often lead to the normal use of the mold, so the injection mold needs to be overhauled at intervals, and the problems are found to be dealt with in time. So what points should we pay special attention to when overhauling injection molds? Today Wo Neng precision mold engineers will solve this problem for you.
1. Pay attention to whether there is rust or moisture in the diffuser hole. These problems are generally found to be ruptured internal water pipes. Moisture can cause a fatal short circuit to the heater. If the machine is not running 24/7 but is turned off at night or on weekends, the chances of this condensation increase.
2. Remember to remind the operator not to 'clean up' the hot tip at the gate - if the operator happens to see a small piece of stainless steel at the nozzle of the mold, it may actually be a sprue assembly. 'Cleaning up' what seems to be a hindrance often ruins the hothead. In order not to damage the hot nozzle, please confirm the nozzle type of the hot runner system before taking action, and ensure that all operators are well trained and can identify all the different types of nozzles they come into contact with.
3. Sliding stop buckle - For machines that run non-stop throughout the year, this work should be done once a week.
4. Cross-check the resistance of the heater – You should have measured the resistance of the heater when you first started using it, now is the time to measure it again and compare. If the resistance value fluctuates by 10% or so, it is time to consider replacing the heater to ensure that it does not fail at critical points in the production process. If you have never measured the initial resistance, measure it now and use the value as a reference for future inspections of the heater.
5. Check for signs of wear between the guide post and the guide sleeve – look for signs of scratches or scuffs, which are due to lack of lubrication. You can also extend the life of the guide posts and bushings by lubricating them more, if the marks are only new. If the wear is severe, it's time to replace the parts with new ones. Otherwise, the cavity and core sections may not fit well, resulting in variable cavity wall thickness in the part.
6. Check the water flow – connect a hose to the outlet of the waterway and let the water flow through the hose into the bucket. If the outflow of water is not clear or colored, there may be rust, and if the water flow is not smooth, it means that there is a blockage somewhere.
If you find these problems, re-drill all the water pipes to keep them clear (or use whatever method you use most to clean them). Improving the plant's water treatment system can prevent future problems caused by rust and clogging.
7. Clean the thimbles – Over the course of a year, thimbles can become very dirty from gas buildup and filmy impurities. A good cleaning with mold cleaner is recommended every six to twelve months. After cleaning, apply a layer of lubricant to the thimble to prevent galling or breaking.
8. Check for fractures in the radius area of the hot filling nozzle - fractures are caused by the clamping force brought by the injection plastic barrel assembly from the loose hardened plastic fragments remaining in the hot nozzle of the machine during forward injection molding. It is also possible that the cause of the problem is a misalignment of the centerline. Both possibilities are considered when finding fractures.
1. Pay attention to whether there is rust or moisture in the diffuser hole. These problems are generally found to be ruptured internal water pipes. Moisture can cause a fatal short circuit to the heater. If the machine is not running 24/7 but is turned off at night or on weekends, the chances of this condensation increase.
2. Remember to remind the operator not to 'clean up' the hot tip at the gate - if the operator happens to see a small piece of stainless steel at the nozzle of the mold, it may actually be a sprue assembly. 'Cleaning up' what seems to be a hindrance often ruins the hothead. In order not to damage the hot nozzle, please confirm the nozzle type of the hot runner system before taking action, and ensure that all operators are well trained and can identify all the different types of nozzles they come into contact with.
3. Sliding stop buckle - For machines that run non-stop throughout the year, this work should be done once a week.
4. Cross-check the resistance of the heater – You should have measured the resistance of the heater when you first started using it, now is the time to measure it again and compare. If the resistance value fluctuates by 10% or so, it is time to consider replacing the heater to ensure that it does not fail at critical points in the production process. If you have never measured the initial resistance, measure it now and use the value as a reference for future inspections of the heater.
5. Check for signs of wear between the guide post and the guide sleeve – look for signs of scratches or scuffs, which are due to lack of lubrication. You can also extend the life of the guide posts and bushings by lubricating them more, if the marks are only new. If the wear is severe, it's time to replace the parts with new ones. Otherwise, the cavity and core sections may not fit well, resulting in variable cavity wall thickness in the part.
6. Check the water flow – connect a hose to the outlet of the waterway and let the water flow through the hose into the bucket. If the outflow of water is not clear or colored, there may be rust, and if the water flow is not smooth, it means that there is a blockage somewhere.
If you find these problems, re-drill all the water pipes to keep them clear (or use whatever method you use most to clean them). Improving the plant's water treatment system can prevent future problems caused by rust and clogging.
7. Clean the thimbles – Over the course of a year, thimbles can become very dirty from gas buildup and filmy impurities. A good cleaning with mold cleaner is recommended every six to twelve months. After cleaning, apply a layer of lubricant to the thimble to prevent galling or breaking.
8. Check for fractures in the radius area of the hot filling nozzle - fractures are caused by the clamping force brought by the injection plastic barrel assembly from the loose hardened plastic fragments remaining in the hot nozzle of the machine during forward injection molding. It is also possible that the cause of the problem is a misalignment of the centerline. Both possibilities are considered when finding fractures.
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