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(xia)機筒的均化段(duan)磨損較(jiao)快，可將(jiang)此段(duan)(取(qu)5~7D長)經鏜(tang)孔修整，再(zai)配一個(ge)滲氮(dan)合金鋼(gang)襯套，內孔直徑參照擠(ji)出機螺桿直徑，留(liu)在正常配合間隙(xi)，進行(xing)加(jia)工配制。

擠(ji)出(chu)機螺桿(gan)和(he)機筒這(zhe)兩個(ge)重要零件，一個(ge)是細(xi)長(chang)的螺紋桿(gan)，一個(ge)是直徑比較小(xiao)而長(chang)的孔，它們的機械加工和(he)熱處理工藝都比較復(fu)雜，精度的保證都比較困難(nan)。所(suo)以，對這(zhe)兩個(ge)零件的磨損(sun)后(hou)是修復(fu)還是更(geng)換新件，一定要從經濟角度全面(mian)分析。

如果修(xiu)理費(fei)用(yong)比(bi)換新(xin)擠出機螺桿費(fei)用(yong)低(di)些，就決(jue)定修(xiu)，這(zhe)不一定是(shi)(shi)正確(que)的(de)選擇，修(xiu)理費(fei)用(yong)與更新(xin)費(fei)用(yong)的(de)比(bi)較，只是(shi)(shi)一個(ge)方面。

另(ling)外還要看修(xiu)理費用(yong)與修(xiu)理后使用(yong)擠出(chu)機(ji)(ji)螺桿(gan)時間與更(geng)新(xin)費用(yong)和更(geng)新(xin)擠出(chu)機(ji)(ji)螺桿(gan)使用(yong)時間的比值(zhi)。采(cai)用(yong)比值(zhi)小的方案(an)才經濟，是(shi)正(zheng)確選擇(ze)。