Basic knowledge of industrial bearings (3)

Basic Knowledge of Industrial Bearings (3)

Source: China Bearing Network | Time: 2014-04-07

Processing of Solid Cages

The manufacturing process of solid cages varies depending on the raw material or the condition of the blank. Before machining, the blanks are typically categorized into four types: solid materials, pipe materials, forgings, and castings. The general processing steps include: turning the inner and outer diameters, facing the ends, chamfering, drilling (or pulling holes, boring), pickling, final inspection, rust prevention, packaging, and then storing in the warehouse.

Installation Process of Rolling Bearings

Once the rolling bearing components—such as the inner ring, outer ring, rolling elements, and cage—pass inspection, they are moved to the installation workshop for assembly. The installation process includes demagnetization and cleaning, sorting by internal and external raceway dimensions, setting up the bearing, checking the clearance, riveting the cage, final inspection, demagnetization, rust prevention, packaging, and finally storing the finished product in the warehouse for boxing and shipping.

Advantages of Rolling Bearings Over Sliding Bearings

Rolling bearings offer several advantages over sliding bearings: 1. **Lower Friction Coefficient**: Rolling bearings have a much lower friction coefficient (0.001–0.005) compared to sliding bearings (0.08–0.12), resulting in higher transmission efficiency. 2. **Standardization and Mass Production**: They are standardized, serialized, and generalized, making them easy to produce, supply, and maintain. 3. **High Strength and Longevity**: Made from bearing steel and heat-treated, rolling bearings are durable and can reduce the use of costly non-ferrous metals. 4. **Precision and Rigidity**: With small internal clearances and high machining precision, rolling bearings provide high working accuracy and can be preloaded for added rigidity, which is essential for precision machinery. 5. **Dual Load Capacity**: Some rolling bearings can handle both radial and axial loads, simplifying the bearing support layout. 6. **Energy Efficiency**: Their high efficiency reduces heat generation and oil consumption, making maintenance more cost-effective. 7. **Versatile Orientation**: Rolling bearings can be used in any orientation in space.

Disadvantages of Rolling Bearings

Despite their advantages, rolling bearings also have some drawbacks: 1. **Smaller Load Capacity**: Rolling bearings have a smaller load capacity relative to their size, making them less suitable for applications requiring large radial loads with compact designs, such as engine crankshafts. 2. **Noise and Vibration**: They tend to generate more noise and vibration, especially as they age. In high-precision environments where minimal vibration is required, sliding bearings may be preferred. 3. **Sensitivity to Contamination**: Rolling bearings are highly sensitive to foreign particles like metal chips. Contamination can cause irregular noise and early failure. 4. **Limited Lifespan**: Even without immediate damage, rolling bearings have a defined service life, which is generally shorter than that of sliding bearings.

Conclusion

While each type of bearing has its own strengths and weaknesses, they are often used in different applications based on specific requirements. Rolling bearings have gained popularity due to their performance and versatility, becoming the primary choice in many mechanical systems. However, sliding bearings still play an important role in certain specialized areas. Together, they continue to expand the possibilities of mechanical design and engineering.
Related Bearing Knowledge
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