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Inspecting SKF bearings visually is an essential step in ensuring their quality and performance. This process should be done under proper lighting conditions, using a magnifying glass if necessary, to carefully examine the bearing’s surface for any defects.
1. **Peeling and Folding**:
These issues are often found on the surface of the bearing and may not be fully bonded with the base metal. They can cause decarburization or carbon depletion around the affected areas. These flaws can lead to deformation, embossing, or wear, significantly reducing the bearing's lifespan and precision.
2. **Cage Quality (Riveting and Welding)**:
Check whether the rivet heads are aligned properly, without tilting, looseness, or missing material. Ensure that the welding is correctly positioned and that the solder joints are not too large. Poor cage construction can result in misalignment and poor performance.
3. **Rust, Black Skin, and Pitting**:
These are common problems caused by improper storage, such as exposure to moisture or dirt. Rust can lead to corrosion, which affects installation, causes early wear, and reduces the bearing’s life. Severe rust can render the bearing unusable.
4. **Mechanical Scratches and Marks**:
Scratches, dents, and abrasions can affect the bearing’s performance. These imperfections may cause uneven loading, stress concentration, and reduced rotational accuracy, ultimately shortening the bearing’s service life.
5. **Cracks**:
Cracks can occur due to various reasons, such as casting, heat treatment, or grinding. Even small cracks can act as stress points during operation, leading to failure over time. For critical applications, SKF manufacturers perform 100% magnetic or radiographic testing on all components.
In addition to the above, other signs like poor engraving, unclear markings, or damaged labels should also be considered as potential defects. In severe cases, such bearings should not be used at all.
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How to view the SKF bearing through the appearance
Source: Bearing Network | Date: August 12, 2013