影响轧机轴承寿命主因的探究

Explore main reason affecting the service life of rolling mill bearing

针对轧机滚动轴承短寿及烧损的问题,进行了一系列理论计算和实验研究,轴承损坏的原因在于轧机辊系的超静定性和静不定性,轧辊受载荷发生弯曲成挠度而辊颈倾斜,轴承座因缺少铰链副而不能同步倾斜,导致轴承异常偏载,降低了轴承承载能力。由于轧辊之间交叉产生异常轴向力损坏止推轴承。解决的方法:改造轧机的机构学静定性;在设计非静定轧机轴承承载能力时,必须在结构容许条件下乘上安全系数3以上。

According to the problems of short service life and frequent burning of roller bearing, a series of theoretical calculation and experiment research are conducted. The reason lies in the hyper static characteristics and statically indeterminate characteristics of the roll system. The former means that the roll has a bending deformation due to the rolling load and its neck shows an inclination, however, the chock cannot rotate with the inclination of the roll neck, which induces an unbalancing load of the roller bearing and decreases the carrying capacity. The latter means that an excessive axial force acting on the end-thrnst roller bearing due to the cross of the rolls. The solving methods contain two aspects, the first is that the structure of the mill should be redesigned with a statically determinate characteristics. The second is that the carrying capacity of the roller bearing in the non-statically determinate rolling mill should be more than three times than allowable load of roller bearing.