Schaeffler has introduced a new line of casing bearings that feature three slightly larger casing rollers placed between traditional solid cylindrical rollers. This innovative design helps prevent misalignment in cylindrical roller bearings, especially under low-load conditions. These advanced FAG casing bearings are engineered for use in harsh and demanding environments, such as hot-rolled steel mills, where bearings experience extreme loads during the steel rolling process and then become nearly unloaded after transfer. In such scenarios, bearing offset can occur, leading to potential damage.
Rainer Eidloth, from Schaeffler Group, explained: "Before the load is applied, the size difference between the casing roller and the solid roller is almost negligible. However, when subjected to radial loads, the casing roller deforms elastically and eventually reaches a size comparable to that of a solid roller. This ensures even load distribution across all rolling elements."
The company’s representative added that the new bearing design is simple, easy to install, and compatible with standard cylindrical roller bearings due to its standardized dimensions. Currently, Schaeffler is working on the second generation of this design to better suit various operational conditions.
At the recent Hannover Fair, Schaeffler showcased a smaller version of the bearing, which is suitable for applications like hot-rolled steel mills, wind turbines, and paper mills. Additionally, the company has developed another bearing designed for extreme conditions, made from 'Cronitect'—a corrosion-resistant material composed of chromium, nitrogen, and a special surface treatment. This material enhances both strength and resistance to corrosion.
Cronitect bearings have been tested for over 600 hours in salt spray tests according to DIN50021-SS, showing no signs of corrosion. The Schaeffler team claims 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.
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