1, the drum quality is not good, die core hole and the drum clearance is small.
2. Unreasonable design of mold water transportation, and ordinary cylinder works at high temperature.
If it is die casting mold should use high temperature resistance drum.
3. Abnormal friction between the outer tube of the drum and the inner needle may be the last plate of the moving mold to fix the internal pinhole and the thimble plate.
4, the material of the moving die core, my experience, a kind of 136 steel material is not suitable for after the die, easy to burn thimble, inclined top.
Regular maintenance of mold parts plays a crucial role in the service life of molds. The annual maintenance procedure required for each injection molding position depends on the different mold cycle. Here are some tips for mold parts overhaul that every mold user can use to ensure the effective operation of mold components such as hot runner, heater, guide post and thimble, molding insert, etc., in case of unexpected events.
1. Check whether there is any early-warning rust or moisture in the loose stomata. If you find rust or moisture near the vent of a hot runner, that means internal condensation, or the pipe may break. Moisture can cause a fatal short circuit to the heater. If the machine is not running year-round and needs to be turned off at night or on weekends, the chances of such condensation increase.
2. Remember to remind the operator not to "clean" the hot nozzles at the gate. If the operator happens to see a small piece of stainless steel at the nozzle of the mold fitting, it may be a nozzle assembly. "Cleaning up" what seems to be an obstacle often ruins the hot mouth. To avoid damaging hot nozzles, confirm the type of nozzles in the hot runner system before taking action and ensure that all operators are trained to recognize the different types of nozzles they are exposed to.
3, sliding stop. This work should be done weekly for machines that run year-round. The end of the year is a good time to give the parts a routine lubrication.
4. Cross-check the resistance value of heater. You should have measured the resistance of the heater when you first started using it, and at the end of the year it is time to measure it again and compare it. If the resistance value fluctuates by ±10%, the heater should be considered for replacement to ensure that it does not break down at critical points in the production process. If the initial resistance value has never been measured, measure it once and use it as a reference for future inspection of the heater.
5. Check guide posts and guide suites for signs of wear. Find out if there are any marks of scratches or scratches. This kind of mould accessories wear is caused by lack of lubrication. If traces are just emerging, you can extend the life of the guide posts and sleeves by lubricating them. If the wear is serious, it's time to replace the parts. Otherwise, the cavity and core parts may not fit together well, resulting in different thickness of the cavity wall of the parts.