Fatigue Prediction of Thin Hard Coatings on the Steel Races of Hybrid Bearings Used in High Speed Machine Tool Spindles

[+] Author and Article Information
K.-D. Bouzakis, N. Vidakis, S. Mitsi

Laboratory for Machine Tools and Manufacturing Engineering, Department of Mechanical Engineering, School of Engineering, 54006 Aristoteles University, Thessaloniki, Greece

J. Tribol 120(4), 835-842 (Oct 01, 1998) (8 pages) doi:10.1115/1.2833787 History: Received November 20, 1997; Revised March 18, 1998; Online January 24, 2008


The rotational speed requirements of high speed spindles led to the development of angular contact hybrid bearings with ceramic balls and PVD coated steel races. The present paper describes the determination and verification of critical coating fatigue stresses as well as their application in coating fatigue calculations of hybrid bearing steel races. The fatigue limits of low temperature deposited PVD coatings were determined by the application of the impact test and its FEM simulation and validated through their successful application to the prediction of coating life in rolling contact fatigue tests of coated specimens. Furthermore, a computer program that performs the quasi-static simulation of bearing operation yields the necessary kinematic and dynamic parameters for a FEM simulation of the stress field occurring in coated rings. For the investigated bearings, an adequate fatigue performance of their coated races was computationally exhibited. The PVD coated hybrid bearings illustrated the predicted behavior in long duration tests, conducted in full scale test rigs.

Copyright © 1998 by The American Society of Mechanical Engineers
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