Annual repair procedures required at each injection molding location depend on different mold cycle times. The following are some general principles that can be used by each mold user to ensure the efficient operation of hot runners, heaters, guide posts, and ejector pin mold assemblies to prevent accidents.
1. Check if there is an early warning of rust or moisture at the diffuser hole.
If you find rust or moisture in the vicinity of the hot runner vent, it means that the internal condensation or the water pipe may be broken. Moisture causes a fatal short circuit to the heater. If the machine does not run for the whole year, but it 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 out" the hot mouth at the gate.
If the operator happens to see a small piece of stainless steel at the die outlet, it may actually be a point nozzle assembly. "Cleaning up" what appears to be an obstruction can often ruin a hot mouth. In order not to damage the hot mouth, confirm the nozzle type of the hot runner system before taking action to ensure that all operators are trained and able to recognize all the different types of mouths they are exposed to.
3, sliding buckle.
For machines that run throughout the year, this work should be done once a week. The end of the year is a good time to perform a routine lubrication service on these parts.
4. Verify the resistance of the heater.
You should have measured the resistance of the heater just before you started using it. It is time to measure it again and compare it. If the resistance value is 10% above or below the float, consider replacing the heater to ensure that it does not come out at a critical moment in the production process. If you have never measured the initial resistance value, measure it now and use the resulting value as reference data for future inspections of the heater.
5. Look for signs of wear between the guide posts and guide bushes.
Look for signs of scratches or scratches that are due to a lack of lubrication. If traces are only present, you can extend the life of the guideposts and bushings by adding more lubrication. If the wear is very serious, it is time to replace the new part. Otherwise, the cavity and the core part may not be well matched, resulting in a thin and thick part wall.
6, check the flow situation.
Connect a hose at the outlet of the waterway and let the water stay in the bucket through the water pipe. If the outflow of water is not clear or colored, there may be rusting, and the lack of smoothness means that it is blocked somewhere. If you find any of these problems, drill all the water pipes again and ensure that they are clear (or use any method you use most often for cleaning). Improvements to the plant's water treatment system can prevent future problems caused by rust and blockages.
7, cleaning thimble.
After a year, the ejector pin becomes very dirty due to gas accumulation and filmy impurities. It is recommended to clean it with a mold cleaner every six to twelve months. After cleaning, apply a layer of lubricant to the thimble to prevent galling or breaking.
8. Check if there is a fracture in the radius of the hot filling nozzle.
Fracture is caused by the holding force of the loose, hardened plastic scrap that remains in the hot mouth of the machine from the plastic injection canister assembly during forward injection. The cause of the problem may also be misalignment of the centerline. Consider these two possibilities when you find a fracture. If the damage has been severe enough to prevent petal-like leakage (a term previously used by the user of the mold: plastic leakage between the guide sleeve and the hot mouthpiece of the machine), the sprue bushing should be replaced.
Using these recommendations will help you identify and prevent potential problems and ensure your mold is always running at its best.
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