Bearing Failure Mechanism (2)

Source: China Bearing Network Time: 2013-02-12

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3. Cracking Failure Cracking failure is often the result of internal defects or excessive loading. When the applied load exceeds the material's strength limit, it leads to what is known as overload cracking. This can occur due to sudden malfunctions in the host machine or improper installation. Additionally, micro-cracks, shrinkage, air bubbles, large foreign particles, overheating, and localized burns during the manufacturing process can cause cracks under impact or severe vibrationsâ€”this type of failure is referred to as fault cracking. It should be noted that during production, inspection, casting, heat treatment, and machining, these defects can be identified through proper testing and instruments. However, in practice, most bearing cracking failures are typically caused by overload conditions. Therefore, quality control must be strictly enforced throughout the entire production cycle. 4. Clearance Change Failure During operation, the original clearance between bearing components may change due to external or internal factors, leading to reduced precision or even a condition known as "seizing." External factors such as excessive interference fit, misalignment, thermal expansion due to temperature rise, or sudden overloads can all contribute to this issue. Internal factors include unstable residual austenite and residual stresses, which can also lead to clearance changes and subsequent failure. Proper design, installation, and maintenance are essential to prevent such problems and ensure smooth operation.

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