Because wear increases, the diameter of the barrel, if there is a certain of nitriding layer, can be boring, the barrel inner hole directly grinding to a new diameter size, and then according to the diameter of the new extruder screw.

The internal surface hardness of the cylinder is higher than that of the extruder screw, and its damage is later than that of the extruder screw.The scrap of the cylinder is the diameter of the inner diameter increased due to time wear.

The repair method is as follows:    

1, because wear increases, the diameter of the barrel, if there is a certain of nitriding layer, can be boring, the barrel inner hole directly grinding to a new diameter size, then click here to make new extruder screw diameter.    

2. The inner diameter of the cylinder is machined and re-cast alloy, and the thickness is between 1~2mm, and then finished to the size.

3、一般情況下機(jī)筒的均化段磨損較快，可將此段(取5~7D長)經(jīng)鏜孔修整，再配一個滲氮合金鋼襯套，內(nèi)孔直徑參照擠出機(jī)螺桿直徑，留在正常配合間隙，進(jìn)行加工配制。

擠出機(jī)螺桿和機(jī)筒這兩個重要零件，一個是細(xì)長的螺紋桿，一個是直徑比較小而長的孔，它們的機(jī)械加工和熱處理工藝都比較復(fù)雜，精度的保證都比較困難。所以，對這兩個零件的磨損后是修復(fù)還是更換新件，一定要從經(jīng)濟(jì)角度全面分析。

如果修理費(fèi)用比換新擠出機(jī)螺桿費(fèi)用低些，就決定修，這不一定是正確的選擇，修理費(fèi)用與更新費(fèi)用的比較，只是一個方面。

另外還要看修理費(fèi)用與修理后使用擠出機(jī)螺桿時間與更新費(fèi)用和更新擠出機(jī)螺桿使用時間的比值。采用比值小的方案才經(jīng)濟(jì)，是正確選擇。