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Schaeffler introduces new casing bearings for demanding environments
Schaeffler has introduced a new line of casing bearings designed to address common issues in cylindrical roller bearings, especially under low-load conditions. These bearings feature three slightly larger casing rollers placed between standard solid cylindrical rollers. This innovative design helps prevent misalignment and displacement that can occur when the load is minimal, ensuring more stable and reliable performance.
The newly developed FAG casing bearings from Schaeffler are ideal for use in harsh environments such as hot-rolled steel mills. During the steel rolling process, these bearings experience extreme loads, but once the material is transferred, they often face near-zero loading. In such situations, bearing offset becomes a risk, potentially leading to damage. The new casing design effectively mitigates this issue by maintaining proper alignment even under fluctuating loads.
According to Rainer Eidloth from Schaeffler Group, “Initially, the size difference between the casing roller and the solid roller is almost imperceptible. However, when radial load is applied, the casing roller deforms elastically due to its material properties. Over time, it expands to match the size of a solid roller, allowing the load to be evenly distributed across all rolling elements.â€
The company’s head emphasized that the design is not only simple but also user-friendly, making installation straightforward. Moreover, because the bearings are available in standard sizes, they can easily replace conventional cylindrical roller bearings without requiring any modifications. Eidloth added that the second generation of this design is currently undergoing testing to adapt to various operational conditions.
At the recent Hannover Fair, Schaeffler showcased a prototype of the new bearing, which is smaller than many of their other products. These bearings are suitable for challenging applications beyond steel mills, including wind turbines and paper mills. Additionally, the company has developed another type of bearing made from a special material called "Cronitect," combining corrosion-resistant properties with martensitic hardened steel.
"Cronitect" stands for chromium, nitrogen, and corrosion resistance. While martensitic steels with chromium and nitrogen have been known for some time, Schaeffler claims that the unique chemical composition and advanced surface treatment make their product exceptionally strong and resistant to corrosion.
The Cronitect bearings have been tested for over 600 hours on a salt spray tester according to DIN 50021-SS, showing no signs of degradation. According to Schaeffler, these bearings can withstand exposure to water, amino acids, and cleaning agents. The material is available in both sealed and unsealed versions, offering flexibility for different industrial needs.