Cracking in FAG spherical roller bearing rings is a common issue that can significantly affect the performance and lifespan of bearings. Understanding the root causes and implementing effective countermeasures are essential to ensure the reliability and durability of these critical components. 1. Material Quality Issues The initial material used for manufacturing the bearing rings plays a crucial role in their integrity. If the raw material has issues such as segregation, carbide clustering, or uneven distribution of elements, it can lead to stress concentration and weaken the basic strength of the ferrule. This makes the component more prone to cracking under operational stress. Preventive Measures: It's important to source high-quality steel from reliable suppliers. Implement strict quality control during the receiving process to ensure consistency and stability. Regular inspections and proper storage conditions should be maintained to prevent degradation of materials before they are processed. 2. Production and Equipment Factors a. Casting Process: During casting, if overburning, overheating, internal cracks, or mesh-like carbides occur, the mechanical properties of the bearing ring can be compromised. To avoid this, precise temperature control, proper heating cycles, and adequate cooling methods (such as spray cooling) must be strictly followed, especially after the final forging of larger-sized rings. b. Heat Treatment: The heat treatment process is one of the most critical stages in bearing production. Monitoring equipment, such as thermocouples and external temperature devices, must be regularly calibrated to ensure accuracy. Data recording is also vital to track the entire process, including night shifts, for better traceability and compliance with ISO9000 standards. c. Quenching and Cooling Conditions: For large and medium-sized FAG spherical roller bearings, improper quenching can result in soft spots. The composition and performance of quenching oil should be carefully selected, and regular replacement is necessary. Using fast-quenching oil with moderate hardening ability can improve the cooling process and enhance the overall quality of the bearing rings. d. Tempering Process: A proper tempering procedure is essential to reduce residual stresses and improve the structural stability of the bearing rings. Secondary tempering after rough grinding helps to stabilize the microstructure and reduce grinding-induced stresses. This practice has been successfully applied to models like 22328/02 and 22236/02, with no significant issues reported post-sale. e. Grinding Process Monitoring: Any signs of grinding burns or cracks on the FAG spherical roller bearing rings must be addressed immediately. In particular, the inner ring taper surface must remain free of burn marks. If any damage is detected, the affected parts should be removed and not allowed to proceed to the assembly stage. f. Material Identification: Before storing the steel or before grinding the bearing rings, strict handling procedures must be followed. Different materials, such as GCr15 and GCr15SiMn, should be clearly distinguished to avoid mixing, which could lead to unexpected failures. 3. Overload and Fatigue Cracking Overload and fatigue cracking often occur together, especially in bearings operating under harsh conditions, such as the FAG 22328 model. Analyzing the cracking patterns requires a comprehensive approach, considering not only the production process but also factors like the bearing layout, measurement techniques, and qualification standards. Key Considerations: By addressing these factors through improved material selection, optimized production processes, and enhanced quality control, manufacturers can significantly reduce the incidence of cracking in FAG spherical roller bearing rings. This not only improves product reliability but also enhances customer satisfaction and long-term performance. Related Bearing Knowledge: This article is linked to http://. Please indicate the bearing network at http://. Previous: The reason for the early damage of NTN bearing is the following: The cause of the crack in the bearing race Towel rack,Towel holder,Towel rail,Towel rod Kaiping City Kaipu Sanitary Ware Co.,Ltd. , https://www.china-kpo.comThe Causes and Solutions for Cracking in "FAG Spherical Roller Bearing Rings"
The reason and countermeasures of "FAG spherical roller bearing ring" cracking
Source: China Bearing Network | Time: 2014-06-16
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