1. The broken screw should be considered according to the actual inner diameter of the barrel, and the outer diameter deviation of the new screw should be given according to the normal clearance with the barrel for manufacturing.
2. After the thread surface of the worn screw with reduced diameter is treated, it is thermally sprayed with wear-resistant tungsten carbide alloy, and then ground to size.
3. Wear-resistant tungsten carbide alloy is clad on the threaded part of the worn screw. According to the degree of wear of the screw, the thickness of the cladding is 1~2mm, and then the screw is ground to size. This wear-resistant tungsten carbide alloy is composed of materials such as C, Cr, Vi, Co, W and B, which increases the wear and corrosion resistance of the screw. 4. The bottom diameter of the repaired screw is treated by electroplating hard chrome. Chromium is also a wear-resistant and corrosion-resistant metal, but the hard chromium layer is easier to fall off.
