3500中厚板四辊轧机工作辊杆系分析和轴承寿命评估

Linkage Analysis of 3500mm Heavy and Medium Plate Four-high Mill Work Roll and Bearing Longevity Calculation

35 0 0mm中厚板四辊轧机工作辊四列圆锥滚子轴承 ,同时承受径向力和轴向力。其工况为承受上轧辊系的过平衡力 ,或需要板形控制时承受弯辊力 ,以及工作辊受到的轴向力。圆锥轴承已经按照现有轧机设计理论严格选择 ,但短寿烧损状况长期困扰着轧机安全运行。对工作辊辊系机构进行杆系分析 ,确定轴承工作的约束条件。开发梯形板单元模拟圆锥滚子并固接于内环上 ,外环和内环分别贴合于轴承座及轧辊辊颈 ,将多物体接触滚动轴承简化为两物体三维弹性摩擦接触问题 ,适用于三维弹性摩擦接触边界元法 ,获得圆锥轴承三维负荷分布。并针对圆锥滚子轴承同时承受径向载荷和轴向载荷的特点进行改进 ,计算得到的结果更接近实际 ,轴承滚子载荷分布解析更为准确 ,花费时间并无显著增加 ,证明本方法对于圆锥滚子轴承载荷的解析的适用和准确。

Four rows tapered roller bearing is used in 3500mm heavy and medium plate four-high mill to receive axial force and radial force. At first, linkage analysis of the mill's work roll is carried out. Then the constraint condition of the bearing is known. The trapezoidal plate unit is developed and used to replace the tapered roller. The plate unit is fixed on the inner ring. The inner and outer rings are sticking to the chock and the roll neck respectively. So the multi bodies contact problem is simplified as a two bodies 3-D contact problem. Against to the load characteristic of tapered bearing, the method is improved. The example calculation result proves the method effective.