After the screw diameter of the screw diameter of the screw is processed, the thermal spraying wear resistant alloy is applied, and then the grinding is processed to the size.This method generally has professional spraying factory to repair, the cost is relatively low.The repair method of extruder screw is for reference only.

1. The extruder screw should be considered according to the actual internal diameter of the cylinder, and the outer diameter deviation of the new extruder screw should be manufactured according to the normal clearance of the cylinder.    

2. After treatment, the screw diameter of the screw diameter of the screw extruder is treated, and the thermal spraying wear resistant alloy is applied, and then it is machined to the size.This method generally has professional spraying factory to repair, the cost is relatively low.   

3. Surfacing the wear-resistant alloy in the threaded part of the screw extruder.Weld 1~2mm thick according to the degree of wear of extruder screw, and then grind the extruder screw to size.This kind of wear-resisting alloy is composed of C, Cr, Vi, Co, W and B, which increases the anti-wear and corrosion resistance of extruder screw.Professional surfacing factory is very costly to this kind of processing, except for special requirement extruder screw, seldom used.  

4. Repair extruder screw can also be used for hard chromium plating. Chromium is also abrasion resistant and anti-corrosion metal, but the hard chromium layer is easy to fall off.    

Extruder screw and barrel manufacturing materials.

Manufacturing extruder screw and barrel, currently used in domestic materials are 45, 40Cr and 38CrMoAlA.    

The manufacturing materials of extruder screw and cylinder are used in the imported extruder, and the commonly used alloy steel is 34CrAINi7 and CrMoV9.The yield strength of this material is about 900MPa.After nitriding treatment, the hardness is above 1000HV, which is both wear-resistant and good corrosion resistance.