Injection molding machine screw is a long time in high pressure, high temperature, high mechanical Torque and high friction environment to work. The above factors are required by the process conditions, but the wear and tear caused by friction is unavoidable. General screw surface nitrided to improve the surface hardness, that is to improve wear resistance. But if we ignore the cause of wear, do not try to reduce wear as much as possible, will greatly reduce the working life of the screw. The following 2 points to introduce the causes of wear screw and reduce wear methods 1, each plastic raw materials, there is an ideal plasticizing processing temperature range, so should control the barrel processing temperature, and bring it closer to this temperature range. When the granular plastic enters the cylinder from the hopper, it will first reach the feeding section, and dry friction will inevitably occur in the feeding section. When the plastic is not heated enough and the melting is uneven, it is easy to cause the inner wall of the cylinder and the surface of the screw rod to wear and increase, in the compression section and homogenization section, if the melting state of plastic is uneven, it will also cause increased wear. 2. The revs should be adjusted properly. This is because some plastics are fortified with additives such as fiberglass, minerals, or other fillers. These materials tend to have much greater friction against metallic materials than Molten Plastic. When these plastics are injected at a high rotational speed, the shearing force on the plastics is increased and the reinforcement produces correspondingly more shredded fibers, which contain sharp ends that greatly increase the wear force. Inorganic Minerals in the metal surface high-speed sliding, its scraping effect is not small. So the revs shouldn't be set too high.