Experiment and Numerical Study of Wear in Cross Roller Thrust Bearings

Bearings are essential parts used in machine tools where high precision is required. It is important to understand bearing failure in order to replace a bearing before it affects the quality of precision. Bearing failure appears as a run-out in some applications, which is a critical factor for precision. However, previous studies have only focused on failure mechanisms, such as spalling. In this study, two types of wear models were used to predict the thrust bearings run-out: Linear and non-linear mechanisms. In order to validate the models, wear experiments of cross roller thrust bearings were performed. The average difference between the experiment and simulation run-out result was 16%. Then, the wear of different sized cross roller bearings was predicted by using a simulation. This was compared with the experiment result and showed up to a 6% difference. The suggested wear models are expected to be used to predict the failure/life of bearings.

[1]  F. Sadeghi,et al.  Numerical modeling of sub-surface initiated spalling in rolling contacts , 2013 .

[2]  T. Tallián,et al.  An engineering model of spalling fatigue failure in rolling contact. II. The surface model , 1971 .

[3]  R Pandiyarajan.,et al.  Contact Stress Distribution of Large Diameter Ball Bearing Using Hertzian Elliptical Contact Theory , 2012 .

[4]  T. E. Tallian,et al.  An engineering model of spalling fatigue failure in rolling contact , 1971 .

[5]  S. K. Rhee,et al.  Wear equation for polymers sliding against metal surfaces , 1970 .

[6]  Carl Q. Howard,et al.  Analyses of contact forces and vibration response for a defective rolling element bearing using an explicit dynamics finite element model , 2014 .

[7]  Richard E. DeVor,et al.  The effect of runout on cutting geometry and forces in end milling , 1983 .

[8]  F. Sadeghi,et al.  Effects of plasticity on subsurface initiated spalling in rolling contact fatigue , 2012 .

[9]  H. So,et al.  Characteristics of wear results tested by pin-on-disc at moderate to high speeds , 1996 .

[10]  J. A. Gear,et al.  Spalling depth prediction model , 2009 .

[11]  R. Blickensderfer,et al.  Crack propagation and spalling of white cast iron balls subjected to repeated impacts , 1988 .

[12]  F. Sadeghi,et al.  Explicit finite element modeling of subsurface initiated spalling in rolling contacts , 2010 .

[13]  Nack J. Kim,et al.  Microstructure and wear resistance of nanostructured Al2O3-8wt.%TiO2 coatings plasma-sprayed with nanopowders , 2006 .