Trained personnel can determine if the bearing needs repair. By timely maintenance, such as routine inspection, preventive maintenance and vibration analysis, the timing of repair can be properly grasped, thereby helping industrial enterprises to economically repair damaged bearings.
5 bearing repair process
When the repairs arrive at the repair center, all the bearings are thoroughly cleaned and then disassembled, and the repair engineer will record the bearing information and the actual internal clearance, complete the disassembly and mark the unique identification number, and then, all The bearing assembly is checked in detail. Inspections include: major damage problems such as cracks, flaking or thermal damage to determine if the bearing is repairable. After the comprehensive inspection results, the repair plan will be determined.
In addition, in the repair, the inner diameter and bearing width of the inner hole should be comprehensively measured, and the type and degree of damage should be determined to determine whether the bearing can be repaired and a suitable repair solution.
Different industry and application requirements for different bearing repair services, Timken has 7 different types of bearing repair solutions for all types of customers to achieve reliable bearing repair, but in general, bearing repair services are divided into the following three .
• Repair Type I: Mainly for new bearings or bearings with less damage. These include: cleaning tests, overall assessments, minor damage handling, clearance settings and changes.
• Repair Type II: A bearing that is primarily intended for surface damage in a short period of time. Including: cleaning inspection, overall evaluation, disassembly, raceway and rolling element surface treatment, clearance settings and changes.
• Repair Type III: Bearings for all types of damage that require comprehensive repair. These include: cleaning inspection, overall evaluation, disassembly, raceway fatigue layer removal, rolling element replacement, cage machining or replacement, clearance settings and changes.
In short, type I: inspection, cleaning, identification. Type II: Maintenance or surface finish repair process. Damaged bearings require Type III repair, a remanufacturing process. This type of repair involves more processes, such as re-grinding the raceway surface, replacing the rolling elements and cage components, and even replacing more bearing components. In general, re-grinding of the raceway surface requires an increase in the diameter of the rolling elements to compensate for the geometry and play, which ensures radial clearance of the bearing. Due to its speciality, the tapered roller bearing can ensure axial clearance by increasing the rolling element or the new spacer.
Repair Type III is in principle suitable for larger size bearings. Small bearings with small bearing sizes or often scrapped can be repaired if they are in batches. Cleaning, inspection and surface finishing can restore these used bearings to new product performance at a fraction of the cost of replacing new products.
Depending on the site conditions and the extent of the damage, some repairs can be performed on site, but on-site repairs are suitable for maintenance repairs, but not for remanufactured repairs.
When the repair program is determined and repaired, the bearings are reassembled and packaged for storage and shipping. Usually, after the repair, a final inspection is performed to ensure the assembly standard at the time of design. Different vendors perform different levels of inspection and packaging.
6 bearing repair effect
After correct repair, the repaired bearing performance is the same as the new bearing. The precision parameters such as the clearance can meet the requirements of the new bearing. It is important to know and identify the damage degree to choose the correct repair solution. For example, surface finishing can remove some minor damage, but it does not remove the true fatigue layer and does not remove dents or wear caused by debris. Therefore, if the bearing is only surface-polished, it is generally not suitable for damage to severe bearings. However, if a comprehensive remanufacturing repair process is carried out, the fatigue layer of the bearing is completely removed, and the rolling elements are also completely replaced, and the cage is also fully finished, so that the bearing can fully meet the performance requirements of the new bearing.
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