油膜轴承负荷特性的数值解析

NUMERICAL ANALYSIS OF OIL FILM BEARING'S LOADING CAPACITY

轧机油膜轴承频繁出现巴氏合金剥落、龟裂等现象,直接影响到油膜轴承的使用寿命和轧制生产的正常进行.应用三维弹性接触问题的边界元法对宝钢2050支承辊油膜轴承载荷分布进行分析研究,建立了油膜轴承的接触模型,模拟真实的约束与受力,结果轴承出现严重偏载现象.通过改善约束条件,在自位情况下轴承偏载现象大幅度降低,同时接触应力也在一定程度上减小,从而使得轴承的承载能力得到提高.由于考虑了弹性变形的影响,该方法具有计算精度高,收敛速度快等优点.

Abnormal damage of Babbitt Alloy being stripped off and cracking of oil film bearing shortens its service life. By analyzing the backup roller oil film bearing of 2050 rolling mill of BaoShan Steel Co. by 3D-contact BEM, the pressure distribution on bearings is obtained. Contact models of oil film bearing can simulate the ac- tual restricted conditions and external loading. It is observed that unreasonable restriction results in severe non-uniformly distributed load on oil film bearing, and carrying capacity of bearings can be improved through changing restricted conditions. The non-uniformly distributed load is lowered and oil film bearing's service life is prolonged. This result provides a theoretical basis for studying the burnout of oil film bearings and abnormal damage of Babbitt Alloy being stripped off and cracking in the bearing. Owing to the consideration of influence of elastic distortion, this method is advantageous in high precision and convergence speed.