Injection molding machine screw wear caused by reasons

Date：2016-06-27 11:40:57

    Injection molding machine control technology developed countries more advanced, mature and widely used process which is characterized by real-time closed-loop control and CRT or LCD display monitor, and as much as possible on the assignment to the peripheral device is completed by multi-processing, in order to improve communications capabilities within the injection molding machine, the main control section to reduce the load. Which to some extent, represent the future direction of the injection molding machine control technology.

    Injection screw is a long time to work at a high temperature, high pressure, high mechanical torque and high friction environments. Several factors are required before the process conditions, and the loss caused by friction is inevitable. It has been generally screw surface nitriding treatment to improve the surface hardness, i.e. to improve wear resistance. But if you ignore the causes of wear and does not seek to minimize wear and tear inevitably greatly reduce the operating life of the screw.

    1, each of the plastic, has a desirable plasticizing temperature processing, barrel processing temperature should be controlled to make it close to this temperature range. Granular plastic from the hopper into the barrel, will first reach the feed zone, appears dry friction in the feed zone is bound, when these plastic insufficient heat, melt unevenly, it could easily lead to the cylinder wall and screw surface wear increases. Similarly, in the compression section and homogenizing section, if the molten plastic uneven disorder, also cause increased wear.

    2, the speed should be adjusted appropriately. As some plastic added enhancers, such as glass fibers, mineral or other fillers. These substances on metal friction force is often much greater than the molten plastic. When these plastics injection molding, if a high-speed, in the raising of plastic shear force at the same time, will also make a corresponding strengthening produce more torn fibers being torn fibers contain sharp end, so wear force greatly increased. Inorganic minerals at the surface of the metal high-speed taxiing, the scraping action is not small. So speed should not be set too high.

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