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How to repair the abrasion of the screw and barrel?

Click: 996Date: 2014-8-29 9:48:37
Q: How to repair the abrasion of the screw and barrel?
A: There are three methods to repair the abrasion of the screw and barrel:
   (1) If measurement shows that the screw abrasion is relatively large (0.5 mm - 1.0 mm) and the barrel is still good, stacking repairment should be made by alloy spray welding on abrasion locations of the screw, then grind the screw to fit the barrel by grinding machine.
   (2) If the screw and barrel are over abrased, the hole of the barrel can be enlarged by special machine and make nitriding treatment. Screw and screw arris are bead welded with alloy and grinded to match the barrel. Attention must be paid that: The hole of twin screw could not be enlarged too much, consideration should be made on the central distance of coordination. The hole of single screw could not also been enlarged too much, the compression ratio should be considered for over enlarged and installation with new screw. There will be no differences between the repaired screws and barrels and the new ones.
   (3) Replace the screw and barrel. It is recommended to purchase the screws and barrels from the original extruder manufacturers in case the new screw and barrel could not match the electric heating ring, stand, splined sleeve in the barrel of original extruder.
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