Screw injection molding machine for a long time at high pressure, high temperature, high torque and highmechanical friction environment for working. Several factors are in front of the desired process conditions, but the loss due to friction is inevitable. Screw have generally been surface-nitridingtreatment, to improve surface hardness, wear resistance is improved. However, if neglected cause wearreason, do not seek to minimize wear, will be significantly reduced working life of the screw.
2:00 to introduce the following screw wear caused by abrasion causes and ways to reduce
1, each of plastics material, has an ideal temperature range of plastics processing, the processing temperature should be controlled cylinder, so that near this temperature range. Granular plastic from the hopper into the barrel, the first feed zone will arrive in the feed zone bound to dry friction, less heat when these plastic melt unevenly, it is easy to cause the barrel wall and screw surface wear increases; Similarly,in the compression section and homogenizing sections, if uneven disorders molten plastic will causeincreased wear and tear.
2, the speed should be adjusted appropriately. There enhancer because some plastics such as glassfiber, minerals, or other filler. These substances on metal friction of the molten plastic is often greaterthan. When these plastic during the injection, if the high speed, then the increase of the shear force of the plastic, but also will be strengthened accordingly produce more shredded fibers are shredded fibers contain sharp end, so that wear strength is greatly increased. Inorganic minerals speed taxiing on the metal surface, the scraping action is not small. So speed should not be too high.
Article Source China Machinery Network: www.fktcc.com