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Practical all-electric injection molding machine mold parts maintenance knowledge

Aug 21, 2019

Practical knowledge of all-electric injection mold parts maintenance:


1. Check the vents for signs of rust or moisture.

If rust or moisture is found near the vents of the hot runner, internal condensation may occur or the water pipe may rupture. Moisture can cause a fatal short circuit in the heater. If the machine is not running all year round and must be turned off at night or on weekends, the possibility of this condensation increases.


2. Remember to remind the operator not to "clean" the hot mouth.

If the operator sees a small piece of stainless steel on the nozzle of the nozzle, it may be a nozzle assembly. "Clean", a seemingly obstructive thing, often breaks the hot mouth. To avoid damage to the hot nozzle, verify the port shape of the hot runner system prior to operation and ensure that all operators are well trained to identify the different types of mouth they are exposed to.


3. Slide the latch.

For machines that run endlessly throughout the year, this should be done once a week. At the end of the year, it is a good time to lubricate these parts on a regular basis.


4. Check the heater resistance interactively.

You should measure the resistance value when you start using the heater and measure it at the end of the year and compare again. If the resistance value fluctuates by ±10%, the heater must be considered to ensure that it does not fail at critical times in the production process. If the initial resistance value has never been measured, measure it immediately and use the obtained value as reference data to check the heater in the future.


5. Check for signs of wear between the guide pin and the guide sleeve.

Looking for scratches or scratches, these parts of the mold wear out due to lack of lubrication. If traces are just present, extend their life by adding lubricant to the guide pins and guide bushings. If the wear is severe, new wear must be replaced. Otherwise, the cavity and center portion may not be suitable, resulting in a thin wall of the part.


6. Check the water flow.

Connect the hose to the water outlet and let the water enter the bucket through the water pipe. If the water coming out is unclear or colored, there may be some rust. If the water is not smooth, it means it is blocked somewhere. If you encounter these problems, re-drill all the water pipes (or use any of the more common methods of cleaning) to ensure smoothness. Improved system water treatment systems prevent future problems caused by rust and blockage.


7. Clean the thimble.

One year later, the thimble became dirty due to the accumulation of gas and membranous impurities. It is recommended to clean with a mold cleaner every 6-12 months. After cleaning, apply a layer of lubricant to the thimble to avoid scratching or cracking.


8. Check the radius of the hot nozzle for breakage.

The fracture is caused by slightly reinforced plastic fragments that remain in the hot nozzle of the machine and are subjected to clamping forces from the barrel assembly during forward injection molding. The cause of the problem may also be that the centerline is not aligned. When you find a fracture, consider these two possibilities. If the damage is so severe that it does not prevent the appearance of a petal-like leak (the term used by the mold user in the past refers to the plastic leak between the guide sleeve and the machine nozzle), the casting passage of the sleeve should be replaced in time.