The quality of the extruder barrel screw will affect th […]
The quality of the extruder barrel screw will affect the plasticizing ability and production efficiency of the material, so the maintenance of the extruder barrel screw in the daily use process is extremely important. The extruder barrel screw will wear during use. We can surfacing wear-resistant alloy on the thread part of the extruder barrel screw, and increase the extruder barrel screw according to the size of the extruder barrel screw. The ability to resist wear and corrosion, but this method generally has special requirements, generally we rarely use it, because the processing cost is relatively high.
Generally, if the repair cost is compared with the replacement cost, if the modification cost is relatively high, we will generally replace the extruder barrel screw with a new one. There is also a ratio between the repair cost and the time of the extruder barrel screw used after the repair and the replacement cost and the use time of the updated extruder barrel screw. We generally choose a smaller ratio, which is more reasonable and economical.
The barrel and screw cannot be prevented from wear during continuous operation. How to maintain it in our daily work? The wear of the barrel and screw is mainly manifested in the wear during the current application process, especially in the long-term production of high fillers or glass fiber reinforced materials. , the inner diameter of the cylinder will increase. Since the inner surface hardness of the barrel is higher than that of the screw, the damage of the barrel is slower than that of the screw. Therefore, the maintenance of the barrel screw is very important. We will introduce how to maintain it from the following three aspects.
1. The diameter of the barrel screw increases due to wear. If there is a certain nitriding layer, the drilling and grinding of the inner hole of the cylinder can be stopped directly, a new diameter scale can be obtained, and then a new screw can be manufactured according to the new diameter.
2. After machining, repair and recast the inner diameter of the cylinder, control the thickness between 1 and 2 mm, and then stop finishing to the necessary new size.
3. Under normal circumstances, the wear rate of the homogenizing section of the barrel and screw is faster than that in other directions. The drill holes in the homogenization section can be trimmed and a nitrided alloy steel bushing added. The diameter of the inner hole refers to the diameter of the screw, which should be kept within the normal fit clearance and stop processing.
