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  • Several aspects that need attention to reduce the degree of wear of injection molding machine screw

Several aspects that need attention to reduce the degree of wear of injection molding machine screw

Injection molding machine screw for a long time in high temperature, high pressure, high mechanical torque, and high friction environment for work, the first few factors are required by the process conditions, while the wear caused by friction is inevitable.

In general, screws are surface nitride treated to improve the surface hardness, that is, to improve the ability to resist wear. However, if the causes of wear are ignored and no attempt is made to minimize the wear, the working life of the screw will be greatly reduced.

The following will highlight the causes of screw wear and ways to reduce wear.

For each type of plastic, there is an ideal plasticization processing temperature range, which should control the barrel processing temperature, so that it is close to this temperature range. Granular plastic from the hopper into the barrel, the first will reach the filling section, in the filling section will inevitably appear dry friction, when these plastics are underheated, uneven melting, easy to cause the inner wall of the barrel and screw surface wear increases.

Similarly, in the compression section and the homogenization section, if the molten state of the plastic is disorderly and uneven, it will also cause increased wear.

The rotation speed should be properly adjusted. Since some plastics have reinforcing agents, such as glass fibers, minerals, or other fillers. These substances often have a much greater abrasive force on the metal material than molten plastic. In the injection molding of these plastics, if the high speed into the plastic, it will increase the shear force on the plastic at the same time, will also make the reinforcement correspondingly more torn fibers, torn fibers contain sharp ends so that the abrasive force is greatly increased.

Inorganic minerals in the metal surface at high-speed glide, its scraping effect is not small. So the speed should not be adjusted too high.
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