Causes of FAG bearing failure

**Causes of FAG Bearing Failure** Home > Bearing Knowledge > The Cause of FAG Bearing Failure --- *Source: China Bearing Network | Date: January 18, 2013* --- FAG bearings are widely used in industrial applications due to their high precision and durability. However, like any mechanical component, they can fail if not properly maintained or if subjected to improper operating conditions. One of the main reasons for FAG bearing failure is related to the grinding process during manufacturing. This article explores the key factors that contribute to FAG bearing failure, focusing on the impact of grinding heat and force. During the grinding process, a significant amount of energy is consumed as the grinding wheel interacts with the workpiece surface. This leads to the generation of a large amount of heat, which results in extremely high temperatures in the grinding zone—often reaching up to 1000–1500°C within just 0.1 to 0.001 milliseconds. Such extreme temperatures can cause various microstructural changes on the surface of the bearing components, including oxidation, amorphous arrangement, high-temperature tempering, secondary quenching, and even cracking due to thermal stress. ### 1. **Grinding Heat and Its Effects** The intense heat generated during grinding can lead to several critical issues: - **Oxidation Layer Formation**: The high temperature causes the outer surface of the workpiece to react with oxygen from the air and the steel itself, forming a thin oxide layer (about 20–30 nm thick). The thickness of this layer is closely related to the grinding process and serves as an indicator of grinding quality. - **Amorphous Structure**: When the surface reaches a molten state due to the high temperature, the molten metal flows uniformly over the surface and solidifies rapidly. This results in a very thin amorphous layer, typically less than 10 nm thick, which has high hardness but can be easily removed during fine grinding. - **High-Temperature Tempering**: In some cases, the heat may cause the material beneath the surface to undergo tempering. This can reduce the hardness of the material, especially if the heating temperature exceeds the original tempering temperature. The deeper the affected layer, the more pronounced the hardness reduction becomes. ### 2. **Other Factors Contributing to Bearing Failure** In addition to grinding-related issues, other common causes of FAG bearing failure include: - **Improper Lubrication**: Insufficient or incorrect lubrication can lead to increased friction and wear, reducing the lifespan of the bearing. - **Misalignment**: If the bearing is not aligned correctly with its housing or shaft, it can cause uneven loading and premature failure. - **Overloading**: Exceeding the load capacity of the bearing can cause deformation, cracks, or even complete failure. - **Contamination**: Dust, dirt, or moisture entering the bearing can damage internal components and reduce performance. To prevent FAG bearing failure, it's essential to follow proper maintenance procedures, ensure correct installation, and use high-quality materials and lubricants. Regular inspection and monitoring can also help detect early signs of wear or damage. --- **Related Bearing Knowledge:** - The Essential Analysis of NSK Bearing Noise - LYC Cylindrical Roller Bearing Functional Features - Angular Contact Ball Bearing Series Analysis - Selection Method of SKF Imported Bearings - Characteristics and Usefulness of Tapered Roller Bearings --- This article was originally published on [China Bearing Network](http://www.chinabearing.net). Please cite the source when sharing. Previous: Bearing Box Floating Labyrinth Oil Seal Next: The Method of Extending the Life of NSK Bearings

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