The wear of the barrel and screw is mainly manifested in the wear during use, especially when the use time is long or the long-term production of highly filled or glass fiber reinforced materials causes the inner diameter of the barrel to increase. Because 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.

The maintenance method of the barrel screw is as follows:
1. The diameter of the barrel increases due to wear. If there is still a certain nitriding layer, the inner hole of the barrel can be directly bored and ground to obtain a new diameter size, and then a new screw can be prepared according to the new diameter.
2. Through machining, the inner diameter of the barrel is trimmed and the alloy is re-cast, the thickness is controlled between 1~2mm, and then finished to the necessary new size.
3. Generally, the homogenizing section of the barrel wears faster than other positions. The homogenizing section can be bored and trimmed, and a nitrided alloy steel bushing can be added. The diameter of the inner hole refers to the diameter of the screw. formulate.

Precautions:
The screw barrel of the extruder is two important parts, one is a slender threaded rod, and the other is a hole with a relatively small and long diameter. The machining and heat treatment processes are complicated, and it may be difficult to ensure the accuracy of the barrel during maintenance. , therefore, replacement of new parts is more economical than direct repair in some cases. Repair or replace? It must be measured from an economic point of view. If you feel that the repair cost is lower than the cost of replacing a new screw, you decide to repair it. This is not necessarily a correct decision, but can only be said to be a factor in evaluating whether to repair or not. It may be easier to understand in this way. If the repair cost is lower than the replacement part, it is decided to use the repair method, but the service life of the repaired barrel is much lower than that of the new one, so it is better to replace the new barrel!