Date: 2013-08-22

KOYO bearing material itself caused a snare break

Ring fracture is one of the problems that beset quality KOYO bearings, and fracture is a major ring fracture defects exist, causes mainly raw materials for its own problems or improper operation of the production, device not working properly cause. Actual analysis is as follows.
Raw material inclusions, carbides segregation or loose, brittle element fluid analysis, mesh, Ribbon, no immune defects such as segregation in the processing industry not be eliminated or improved, cause stress concentration and weakened rings basic strength, a source of crack. Preventive measure is to adhere to the main channel of supply, purchasing the steel quality is stable and reliable as possible, enhanced the reporting-as-finished checking on buying of steel, from the source to the good pass.
1. forging: fire in the forging process, overheating, cracking into a mesh of rings of carbon and so reduce the toughness and strength. Must be always strictly controlled process temperature, heating and forging heats (such as spray cooling), especially after large ring forging, temperatures in excess of 700 ° c, shall not be stacked display.
2. heat: heat treatment equipment closely monitoring work is important to the workshop. Monitoring equipment reliability monitor data record; quenching conditions; strict tempering process.
3. monitoring of grinding processes. Finished bearing rings grinding grinding burning and crack are not allowed, in particular the screwdriver on the mating surfaces of the inner ring may not have burned. Ring full inspection should be carried out after pickling, excised burn, severe burns cannot repair or rework defective should be scrapped, entering the Assembly working procedure of grinding burn rings are not allowed.
4. identity management, before the inflow into the ring after grinding of steel, the operations must be strictly regulated, strict separation between GCr15 or GCr15SiMn material of two different materials and products.
Overload fracture and fatigue fracture also exists the possibility of rings, KOYO bearings especially the poor conditions of service (such as 22,328). Study of the ring breaking, not only from the standpoint of material and production defects arising in the course of these considerations to KOYO bearing part of the structure, process measurements, process, KOYO bearings research analysis factors such as conditions of service.
1.KOYO bearing structure and conditions of service.
2. study on strengthening process, improved processing technology and improve processing quality, reducing the possibility of defects in the process.
3. improved process monitoring tools, promoting the improvement of machining quality.  

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