During the operation of the small extruder, the wear of the screw barrel occurs from time to time. The hardness of the screw barrel of the extruder is higher than that of the screw, and its damage is later than that of the screw. The scrapping of the extruder screw barrel is that the inner diameter is increased due to the wear of the time. Its repair method is as follows:
First, due to the increase in the diameter of the barrel, if there is a certain layer of nitrided, at this time we can say that the inner hole of the extruder screw barrel is directly bored, ground into a new diameter size, and then prepared according to the diameter New screw.
Second, the plastic extruder screw barrel inner diameter is machined and trimmed from the beginning casting alloy, the thickness is generally between one millimeter and two millimeters, and then finished to size.
3. Under normal circumstances, the wear of the homogenization section of the screw barrel of the plastic extruder will be faster. This section (take 5~7D long) can be trimmed by the boring, and then a nitriding alloy steel bushing is used. The diameter of the hole is referenced to the diameter of the screw and is left in the normal common gap for processing.
Exaggerated here, the two main parts of the screw and the barrel, one is a slender threaded rod, and the other is a hole with a small diameter and a long diameter. Their machining and heat treatment processes are more complicated, and the precision of the tube is more difficult. . Therefore, after the wear of these two parts is repaired, it is still a replacement of new parts, which must be thoroughly analyzed from an economic point of view. If the cost of patching is lower than that of the new screw, the resolution is revised. This is an accurate choice (zé). The comparison between the patching cost and the update cost is only one aspect. The screw barrel of the extruder also depends on the ratio of the time and the update of the screw and the application of the screw to the application time. It is an economical choice to adopt a plan with a small ratio and is an accurate choice.
