印刷机偏心滚子轴承接触应力与变形仿真分析

目的对偏心轴承接触应力与滚子静、动态变形进行研究,得到接触应力与变形和结构与工况因素的关系。方法在Hertz线接触与弹流润滑理论下,建立滚子接触应力模型及静、动态滚子间接触变形的关系模型,利用有限元软件Ansys仿真计算。建立静、动(润滑与转速)态下滚子变形之间的关系公式,分析印刷机偏心双列圆柱滚子轴承的接触应力与变形及相互关系。结果滚子与内外套圈的接触应力均随径向载荷的增大而增大,滚子与内套圈的接触应力大于滚子与外套圈的接触应力;滚子的总接触变形量与径向载荷呈正比关系,滚子的内外接触应力与滚子的总接触变形量也呈正比关系;滚子的边缘出现应力集中,须用设计凸度的方法降低,从而更好地提高偏心轴承的整体性能。结论根据接触应力与变形的关系,可为偏心轴承的设计与优化提供理论依据。

Simulation Analysis of Contact Stress and Deformation for the Eccentric Roller Bearing in Printing Press

The contact stress of the eccentric roller bearing as well as static and dynamic deformation of the roller was studied, in order to obtain the relationship between the contact stress/deformation and structure/working condition factors. Based on the theories of Hertz elastic deformation and lubrication, the relationship model of the contacting stress and the static and dynamic contacting deformation of the roller was built. And then the finite element software Ansys was used for simulation and calculation. The relationship equation of the roller deformation under static and dynamic (lubrication and rotation speed) conditions was established, and the contact stress and deformation of the eccentric double-row cylindrical roller bearing of the printer as well as the relationship between them were analyzed. It was shown that the contact stress between the roller and the inner and outer rings increased along with the increase of radial load, and the contact stress between the inner ring and the roller was greater than that between the outer ring and the roller. The total contact deformation of the roller was in proportion to radial load, and the internal and external contact stress of the roller was in proportion to the total contact deformation of the roller. The stress concentration appeared at the edge of the roller, and it should be reduced by convexity design, in order to better improve the overall performance of the eccentric bearing. The relationship between the contact stress and the deformation provides theoretical basis for the design and optimization of eccentric bearing.