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When the twin-screw extruder is used to repair the screw, the homogenization section of the barrel is generally worn faster. This section can be trimmed by the borehole, and then a nitriding alloy steel bushing is used. The diameter of the inner hole is referenced to the screw diameter, and the normal fit is left. Clearance, processing and preparation. But here is a point, the two important parts of the screw and the barrel, one is the slender threaded rod, and the other is the small and long diameter hole. Their machining and heat treatment processes are more complicated, and the precision guarantee is compared. difficult. It can be seen that such a problem arises in the screw of the twin-screw extruder, and it is still difficult to repair.
Therefore, after the wear of these two parts is repaired or replaced with new ones, it must be comprehensively analyzed from an economic perspective. If the repair cost is lower than the replacement screw cost, it is decided to repair, this is not necessarily the correct choice, the comparison of repair costs and update costs is only one aspect. Also depends on the ratio of repair costs to screw time and renewal costs after repair and updated screw usage time.