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What should be paid attention to in the maintenance of mold parts

Update:16-04-2021
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Regular maintenance of mold parts plays a vital role in […]

Regular maintenance of mold parts plays a vital role in the service life of the mold. The annual maintenance program required for each injection molding location depends on the different mold cycle cycles. The following are some mold parts maintenance techniques that can be used by each mold user to ensure the effective operation of mold components such as hot runners, heaters, guide pins, thimbles, and molding inserts to prevent accidents.

1. Check whether there is an early warning of rust or moisture at the air diffuser. If you find rust or moisture near the hot runner exhaust hole, it means internal condensation or the water pipe may be broken. Humidity can cause a fatal short circuit to the heater. If the machine is not running all year round and needs to be shut down at night or on weekends, then the chance of this kind of condensation will increase.

2. Cross-check the resistance value of the heater. You should have measured the resistance value of the heater when you first started using it, and the end of the year is when you measure and compare it again. If the resistance value fluctuates by ±10%, consider replacing the heater to ensure that it will not fail at a critical moment in the production process. If the initial resistance value has never been measured, measure it once and use the obtained value as reference data for future inspections of the heater.

3. 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 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 hot runner system before taking any action, and make sure that all operators are well-trained to recognize the different types of nozzles you touch.

4. Slide stop buckle. For machines that operate all year round, this work should be done once a week. And the end of the year is a good time to carry out a routine lubrication maintenance for these parts.

5. Clean the thimble. After a year, the thimble will become very dirty due to gas accumulation and film impurities. It is recommended to clean it with mold cleaner every 6 to 12 months. After cleaning, apply a layer of lubricant to the thimble to prevent scratches or breaks.

6. Check whether there are signs of wear between the guide post and the guide sleeve. Look for signs of scratches or abrasions. This kind of mold parts wear is caused by lack of lubrication. If the marks just appear, then you can extend their life by adding lubricant to the guide posts and guide sleeves. If the wear is severe, new parts should be replaced. Otherwise, the cavity and core part may not fit well, resulting in different thicknesses of the cavity wall of the parts.

7. Check the water flow. Connect a hose at the outlet of the waterway, and let the water pass through the hose and stay in the bucket. If the outflowing water is not clear or has a color, rust may occur, and if the water flow is not smooth, it means that there is a blockage. If you find these problems, drill through all the water pipes again (or take any method you use most to clean up) to ensure smooth flow. Improving the plant's water treatment system can prevent various problems caused by rust and clogging in the future.

8. Check whether there is a fracture in the radius area of ​​the hot nozzle. The fracture is caused by the loose and hardened plastic fragments remaining in the hot nozzle of the machine being subjected to the clamping force from the barrel assembly during forward injection. The cause of the problem may also be misalignment of the center line. When discovering a fracture, consider these two possibilities. If the damage has been severe enough to prevent petal-like leakage, the sprue sleeve should be replaced in time.

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