Thread Content
During operation, the rollers of a rolling mill are subjected to high torque and compressive stresses. If a clearance arises between the shaft and the bearings over time, it will lead to increased wear between the shaft journal and the inner ring of the bearings, resulting in greater vibration and noise in the equipment. This in turn reduces the equipment’s performance and causes uneven rotation of the rollers. Due to changes in the volume of the material during operation, the bearings are prone to radial impact collisions; in severe cases, this can damage the bearings and render the rollers unusable, leading to serious consequences. Traditional repair method: The entire equipment is disassembled and sent out for external processing; repair is carried out through surfacing, spraying, followed by machining. This process is prone to uneven thermal stress or thermal deformation, and it requires external repair, which is time-consuming and costly. The cost must include disassembly and assembly fees, as well as machining costs; downtime will affect production! Tools and materials: 2211F metal repair material, welding and gas cutting tools, grinder (~220v), anhydrous ethanol (99.7% or higher), brush, putty knife, mixing board, rubber gloves. Damaged bearing area: Use a grinder to remove the oxide layer from the surface so as to reveal the original color of the metal ； Clean the surface with anhydrous ethanol ； Positioning of solder joints on the bearing surface: Mix 2211F metal repair material in a 2:1 ratio; ensure a uniform mixture with no color differences ； Apply a sufficient thickness of 2211F metal repair material to the surface of the journal; no bubbles should form within the material during this process. Install the bearing to achieve the desired preload at the time of a no-load test. After the first repair is completed, perform surface treatment again by grinding away any excess material, and roughen the surface using sandpaper ； Apply the 2211F metal repair material a second time; equipment assembly. Note: The most important aspect is surface treatment – 95% of failures are due to poor surface treatment; the surface must be clean, dry, and solid.