How to maintain plasticized parts
After the injection molding machine has been running for a period of time, careful users should find that the plasticized parts of the injection molding machine have begun to wear gradually. Although the workload required for the plasticized parts is large, generally speaking, the plasticized parts can be used for a long time. Therefore, if the plasticized parts are found to wear early, Then pay attention to whether the usual maintenance work has not kept up.
1、 Mechanical wear
Some modified plastics are added with minerals, glass fiber, metal powder, etc. the existence of these materials will carry out uniform mechanical wear on the screw, three small parts and glue barrel day by day in the process of plasticization and injection processing of injection molding machine. The nitride layer and chromium plating layer can be ground off. After wear, the gap between the screw and the glue barrel is increased, the plasticizing effect is reduced, the glue injection leakage is increased, the injection efficiency is reduced and the machining accuracy is reduced.
Therefore, in order to minimize wear and prolong the service life of plasticizing components of injection molding machine, the temperature should be properly increased and the screw speed should be reduced. Chrome plating or bimetallic scheme can more effectively prevent wear.
- Fatigue and overload operation of injection molding machine
The commissioning personnel habitually set low temperature work and high speed and high pressure work, so that the performance of the plasticizing components of the injection molding machine is gradually degraded. For example, when processing PC and PA plastics, when the temperature does not meet the requirements, the plastic viscosity is very large. If the sol is forced to act at this time, the sol pressure and sol torque must be increased, thus increasing the stress fatigue of the screw.
At the same time, because the viscosity of the plastic melt is very high at this time, in order to carry out injection molding, it is necessary to increase the injection pressure and injection speed, increase the impact and load of the three small parts, and accelerate their wear and stress fracture.
3. Correct assembly, commissioning and replacement of parts
This aspect is also very important. If the assembly of the sol cylinder is not tight enough, the screw will touch the sol cylinder during the sol or glue injection action, resulting in the wear of the screw or sol cylinder. Therefore, we should regularly check the technical status of the injection molding machine and pay attention to the abnormalities of parts in processing.
The above content is about the maintenance of plastic parts of the injection molding machine. When you work with the injection molding machine, you should pay more attention. Be careful that it will accelerate the wear of plastic parts. Only by using the injection molding machine reasonably, the injection molding machine can work for us for a long time.
