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

 

1. Check for precautionary rust or moisture at the diffuser. If you find rust or moisture near the hot runner vent, it means internal condensation or the water pipe may rupture. Moisture can cause a fatal short circuit to the heater. If the machine is not running all year round and needs to be turned off at night or on weekends, the chances of this condensation will increase.

 

2. Remember to remind the operator not to “clean up” the hot mouth at the gate. If the operator happens to see a small piece of stainless steel at the nozzle nozzle, it could be a spout assembly. "Clean up" this seemingly obstructive thing often ruins the hot mouth. In order not to damage the hot mouth, please confirm the type of mouth of the hot runner system before taking action and ensure that all operators are well trained to identify the different types of mouths they are exposed to.

 

3, sliding stop. For machines that run endlessly throughout the year, this work should be done once a week. At the end of the year, it was a good time to routinely lubricate these parts.

 

4. Interactively check the resistance of the heater. You should have measured the resistance value when you first started using the heater, and the end of the year is the time to measure and compare it again. If the resistance value is ±10% floating, it is important to consider replacing the heater to ensure that it does not fail at critical times in the production process. If the resistance value has never been measured, it is measured once and the obtained value is used as reference data for future inspection of the heater.

 

5. Check for signs of wear between the guide post and the guide sleeve. Looking for it

 

Scratches or scratches, such mold parts wear is caused by lack of lubrication. If the traces are just emerging, you can extend their life by adding lubricant to the guide post and guide sleeve. If the wear is already serious, you should replace the new one. Otherwise, the cavity and the core part may not fit well, resulting in a thin wall of the parts.

 

6. Check the water flow. Connect a hose at the water outlet to allow water to pass through the water pipe to the bucket. If the water that flows out is not clear or has a color, there may be rusting, and if the water is not smooth, it means that it is blocked somewhere. If you find these problems, drill all the water pipes again (or clean them by any method you use) to ensure smooth flow. Improving the plant's water treatment system will prevent future problems caused by rust and blockage.

 

7. Clean the thimble. After a year, the thimble becomes dirty due to gas accumulation and membranous impurities. It is recommended to clean it with mold cleaning agent every 6~12 months. After cleaning, apply a layer of lubricant to the thimble to prevent scratching or breakage.

 

8. Check if there is a break in the radius of the hot nozzle. The fracture is caused by the loosely stiffened plastic fragments remaining in the hot nozzle of the machine being subjected to the clamping force from the barrel assembly during forward injection molding. The cause of the problem may also be misaligned. Consider these two possibilities when you find a fracture. If the damage is so severe that it does not prevent petal-like leaks, the sprue bushing should be replaced in time.