NSK in load ratings breakthrough In a world first, NSK has introduced a new method of accurately predicting the lifespan of rolling bearings based on their size and the amount of non-metallic inclusions in the steel the bearings are made from. Going forward, NSK’s Angular Contact Ball Bearings, Cylindrical Roller Bearings, Deep Groove Ball Bearings and Tapered Roller Bearings will all see their lifespans increased, potentially even doubled, by this optimisation of basic dynamic load ratings. NSK’s own internal research has shown that the composition and quality of bearing steel, in particular the proportion of the steel which is made up of non-metallic impurities, has a huge impact on a bearing’s service life. Our engineers realised that an evaluation method based on fracture mechanics (a field of mechanics concerned with the study of the propagation of cracks in materials) could provide a unique insight into the lifespan of the bearings. NSK worked with Kyushu University in Japan to develop a quantitative evaluation method that could determine which factors influenced the process of crack propagation in a material, and to what extent. Notably, by combining the new method with an ultrasonic inspection technique that scans the non-metallic inclusions in a large volume of steel, NSK discovered it could predict the life of its bearings with much higher accuracy.
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