The maintenance procedures required for each injection molding position depend on the different mold cycle cycles. The following are some general principles that can be used by each mold user to ensure the effective operation of mold components such as hot runners, heaters, guide posts and thimbles to prevent accidents.
1. Check if there is an early warning of rust or dampness at the vent hole-if you find rust or dampness near the hot runner exhaust hole, it means that the internal condensation or the water pipe may be broken. Humidity can cause a fatal short circuit to the heater. If the machine does not run all year round, but shuts down at night or on weekends, the chance of this kind of condensation will increase.
2. Remember to remind the operator not to "clean up" the hot nozzle 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 nozzle component. "Cleaning up" this seemingly obstructive thing often ruins the hot mouth. In order not to damage the hot nozzle, please confirm the nozzle type of the lower hot runner system before taking action to ensure that all operators are well-trained and can recognize all the different types of nozzles they touch.
3. Sliding stop buckle-For machines that run all year round, this work should be done once a week.
4. Cross-check the resistance value of the heater-you should have measured the resistance value of the heater when you first started using it. Now is the time to measure and compare it again. If the resistance value fluctuates by 10%, you should consider replacing the heater to ensure that it will not malfunction at a critical moment in the production process. If you have never measured the initial resistance value, measure it now and use the obtained value as reference data for future inspections of the heater.
5. Check if there are signs of wear between the guide post and the guide bush-look for signs of scratches or abrasions. This wear is due to lack of lubrication. If the marks just appear, you can extend their life by adding more lubrication to the guide post and guide sleeve. If the wear is severe, it is time to replace the new parts. Otherwise, the cavity and core part may not fit well, resulting in different thicknesses of the cavity wall of the parts.
6. Check the water flow-connect a hose at the outlet of the waterway, and let the water pass through the pipe and stay in the bucket. If the water flowing out is not clear or colored, rust may occur, and if the water flow is not smooth, it means that something is blocked. If you find these problems, drill through all the water pipes again to ensure that they are unblocked (or take any method you usually use for cleaning). Improving the plant's water treatment system can prevent various problems caused by rust and clogging in the future.
7. Cleaning the thimble-After one year, the thimble will become very dirty due to gas accumulation and film impurities. It is recommended to clean it with mold cleaner every six to twelve months. After cleaning, apply a layer of lubricant to the thimble to prevent scratches or breaks.
8. Check whether there is a fracture in the radius area of the hot nozzle-the fracture is caused by the clamping force of the injection barrel assembly from the loose and hardened plastic fragments remaining in the hot nozzle of the machine during forward injection.