What should I do if the bearing is broken

What should I do if the bearing is broken

How to judge whether the bearing can be used again and the defect that needs to be replaced

　　To judge whether the bearing can be used again, it should be decided according to related factors such as bearing damage level, mechanical performance, importance, operating conditions, inspection period, etc.

　　 However, if the following defects are found during the inspection, the bearing cannot continue to be used and needs to be replaced with a new bearing.

　　A. Any one of the inner ring, outer ring, rolling element, and holding frame is cracked or chipped.

　　B. Any one of the rings and rolling elements is broken.

　　C. There are obvious scratches on the rolling surface, ribs and rolling elements.

　　D. Or the rivets are obviously loose. The holding frame is obviously worn out.

　　E. There are rust or scars on the raceway surface and rolling elements.

　　F. There are serious indentations or bruises on the raceway surface and rolling elements.

　　G. There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.

　　H. Discoloration due to overheating.

　　I. Bearing seals or dust caps filled with grease are seriously damaged.

　　Comprehensive repair of the bearing?

The comprehensive repair of the bearing includes cleaning, disassembly, inspection, roller grinding or replacement of the inner and outer rings, new rolling element manufacturing/original rolling element grinding, rolling element replacement, assembly, clearance adjustment, inspection packaging, etc. Comprehensive and strict repair process to ensure that the repaired bearing can meet the performance requirements of the new bearing.

　　What kind of bearing can be repaired?

　　The comprehensive repair of bearings is mainly for large-size rolling bearings (such as transmission bearings, work roll bearings, backup roll bearings, vertical mill bearings, etc.) that are relatively expensive for new products. Of course, bearings with small apertures can also be repaired.

　　Repair technical difficulties

　　 If there are any technical difficulties in bearing repair. Basically, it can be considered that as long as it is a rolling bearing, it can be repaired. We will not change the installation size of the bearing that needs to be repaired, because if the installation size is changed, the bearing cannot be installed normally. However, because of some machining processing necessary for repair, the internal dimensions of the bearing will definitely change. We can compensate for these grinding amounts by other methods.

　　 Can the repaired bearing be as good as new?

　　 However, can the repaired bearing be as good as new? According to Baosteel's staff, we have our own set of inspection methods. The repaired bearing and the new bearing were tested and showed no difference.

At present, bearing repair has become an important cost reduction measure for many industrial companies in the world (including steel, metallurgy, energy, paper, cement, aviation, racing and many other industries). Bearing repair has reduced the operating cost of production equipment and saved them. The purchase cost of production equipment bearings can reach 20%-90%.

　　 Causes of bearing damage

　　 Not all damaged bearings can be repaired, but for each damaged bearing before considering repairing or replacing a new bearing, the cause and extent of its damage must be evaluated to avoid or reduce damage again. There are many reasons for bearing damage, such as improper installation, dirt or moisture intrusion, etc., which are common causes of early bearing damage.

　　 The following is the analysis of common damage causes of some large-size bearings and the corresponding preventive measures that can prolong the life of the bearing.

　　A. Improper operation:

　　 Improper installation, operation or disassembly may cause deformation or defect of the cage. Preventive measures: use appropriate operation, installation and disassembly tools.

　　 B. Insufficient lubrication:

　　 Insufficient or improper lubrication may cause component scratches or serious bearing deformation. Preventive measures: improve the lubrication system, and replenish or replace the lubricant regularly and appropriately.

　　C. Rust and corrosion:

　　 Contact with water may cause corrosion and rust of bearing components. Rust-damaged bearings may cause peeling during work. Preventive measures: Check the seal regularly to ensure a good sealing effect and store the bearing correctly.

　　D. Current:

　　 When the bearing is rotating, energization may cause grooves or nicks. When the bearing is stationary, improper electrical operation grounding can cause minor burns. Preventive measures: reduce or avoid current through the bearing through proper grounding connections before welding parts other than the bearing.

　　E. External materials:

　　Abrasive particle contamination and debris intrusion may cause wear, scratches and dents on the bearing working surface. Preventive measures: remove invading particles and debris, replace lubricants, and check the sealing system.

　　F. Eccentricity: 　

　Eccentricity, inclination or excessive load may cause geometric stress concentration or surface peeling. Preventive measures: precision machining of bearing seats and shoulders.