Damage reason and repair method of screw barrel of granulatorDamage reason and repair method of screw barrel of granulator:
1. The twisted screw should be considered according to the actual inner diameter of the barrel, and manufactured according to the outer diameter deviation of the new screw given by the normal clearance with the barrel.
2. After the thread surface of the abrasion screw diameter is reduced, the wear-resistant alloy is thermally sprayed, and then processed to the size by grinding. This method is generally processed and repaired by a professional spraying plant, and the cost is relatively low.
3. Welding wear-resistant alloy on the threaded part of the worn screw. According to the degree of screw wear, surfacing 1~2mm thick, and then grinding the screw to size. This wear-resistant alloy is composed of C, Cr, Vi, Co, W and other materials, which increases the wear resistance and corrosion resistance of the screw. Professional surfacing plants have a high cost for this kind of processing. Except for screws with special requirements, they are rarely used.
4. The surface of the repair screw can also be hard chrome plated. Chromium is also a wear-resistant and corrosion-resistant metal, but the hard chromium layer is easier to fall off.