Guidance method for replacing the inner ring of rolling mill bearings

Nov 20, 2023

Replacing the inner ring of rolling mill bearings is a highly technical task requiring specific steps and precautions.

Replacing the inner ring of four-row cylindrical roller bearings is essential to bearing maintenance. In rolling mills, as rolling bearings are subjected to high loads and high temperatures for long periods, the inner rings of the rolling bearings may be damaged due to wear or fatigue. In this case, it is necessary to replace the bearing inner ring. The following are the steps and precautions for replacing the inner circle of rolling mill bearings.

1. Preparation work

Make a plan: Make a detailed replacement plan based on the model and specifications of the rolling mill, including required tools, materials, personnel, and timelines.

Shutdown and safety: Before replacing the bearing inner ring, ensure the rolling mill has completely stopped and all relevant power sources are turned off. Install safety warning signs and ensure the operating area is clean and tidy.

Tools and Materials: Have all the tools and materials you need ready, such as lifting equipment, bearing removal tools, lubricants, etc.

2. Disassembly and inspection

Remove the bearing housing: Using a suitable tool, such as a hydraulic crane or a pry bar, remove the bearing from the bearing housing. Be careful not to damage the bearing seat or the inner ring.

Check the inner ring: Check the inner circle of the bearing for cracks, wear, or deformation. Dimensions are measured and recorded if necessary.

Cleaning and storage: Clean the inner ring of the bearing with a clean cloth and cleaning agent, and store it properly for subsequent use.

3. Install the new inner ring

Preparation: Apply an appropriate amount of lubricant to the bearing seat and new bearing inner ring to reduce friction and wear.

Install the inner ring: Carefully install the new bearing inner ring onto the bearing seat. Ensure the inner circle is seated correctly and fits tightly into the bearing housing.

Adjustment and Tightening: Use appropriate tools to level and tighten the bearing to ensure it is positioned correctly and stably in the bearing housing.

Check the clearance: Check the clearance between the bearing inner ring and the bearing seat to ensure that it meets the standards recommended by the equipment manufacturer.

4. Testing and Operation

Testing: Conduct a thorough inspection and testing before restarting the rolling mill. Ensure the newly installed bearing inner ring runs smoothly without abnormal noise or vibration.

Operation: Gradually increase the load of the rolling mill and observe its operating conditions. Ensure that the newly installed bearing inner ring can withstand the working load and that the rolling mill runs smoothly without abnormal noise or vibration.

Recording and reporting: Record data and results of the entire replacement process, including measurement results, operating parameters, and any abnormal conditions. Submit reports to relevant departments for analysis and necessary actions.

5. Things to note

Safety First: Always follow safe operating procedures, especially when handling heavy and electrical equipment. Use the correct tools and equipment and ensure the work area is clean and organized.

Careful operation: Avoid damaging the bearing seat or inner ring during disassembly and installation. Use appropriate bracing and securing methods to protect these components.

Cleaning and Lubrication: Ensure all contact surfaces are properly cleaned and lubricated to reduce wear and frictional resistance. Use the correct lubricant and lubrication method, and be careful not to over-lubricate to avoid contamination.

Follow a Plan: Follow a pre-established plan and make adjustments when necessary to optimize efficiency and safety. Follow the schedule and monitor progress closely.