Three factors affecting the service life of injection molding machine

When the injection molding machine is in use, it often has incorrect operation steps or incorrect maintenance methods, which will affect the basic service life of the equipment. Therefore, pay special attention when operating or using the equipment, otherwise it will affect the service life of the equipment and increase the cost of replacing the equipment, which will greatly increase the trouble of merchants, The following we will take you to understand the three factors affecting the service life of injection molding machines.

First, mechanical wear:

The injection molding machine manufacturer will show you that 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 melting barrel over a long period of time in the process of plasticization and injection processing. The nitride layer and chromium plating layer can be removed. After wear, the gap between the screw and the glue melting barrel increases and the plasticization effect is reduced, The glue leakage flow 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, the temperature should be properly increased and the screw speed should be reduced in the processing of injection molding machine. Chrome plating or bimetallic scheme can more effectively prevent wear.

Second, mechanical fatigue and overload operation:

The commissioning personnel habitually set low temperature work and high speed and high pressure work to gradually degrade the performance of plasticized components. 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 action is forced 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.

Third, human factors (including operational errors or illegal operations):

When metal impurities are mixed in plastic and enter the glue melting cylinder together, due to extrusion, the screw edge, screw groove, rubber ring and rubber washer of the screw are worn to varying degrees, resulting in unstable injection molding processing of the injection molding machine, which is easy to produce black spots and black lines. The plastic is artificially added wrong, and the high-temperature plastic is added to the glue melting cylinder set to low temperature, resulting in excessive torque of the screw during sol, Make the screw stress fatigue.

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