A mill roller bearing is made up of an internal ring, middle rolls and an external ring. It is categorised as a multi-bodied contact problem. In this paper, based on the 3-D elastic contact BEM, and according to the structural peculiarities of roller bearings, middle rolls are described by different shaped elastic plate elements placed on the internal ring. The discontinuous traction problem on the contact element is dealt with by the traction sub-element method. Therefore, the contact problem relating to the roller bearing can be changed from multi-bodies to two-bodies. As for the elastic deformation of the plate element, this can be calculated by the elastic contact formula, and regarded as an equivalent gap to put into the total matrix equality. The contact condition of displacement and traction on the contact or assumed contact element is from face to face. Because the contact condition is served as a convergent-judged condition, the geometry inconsistent phenomenon on the contact element will not occur, and the convergent solution can be gamed. Therefore, the 3-D distribution of load on a mill roller bearing can be achieved. The applied result proves that this new method has resulted in a visualized and simple calculating model, faster convergent solution and higher accuracy. So it becomes an effective numerical method to design and analyse the load peculiarities of a mill roller bearing.
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