中文摘要：

为了证实在备份适用的一台四排的圆柱的压路机的早失败原因，卷一家六高度的冷表工厂的位置，它在严厉操作条件下面的润滑油行为被调查。压路机内部的水沟接触区域，最小的油电影厚度和真实润滑油通过建立并且解决 Elastohydrodynamic 润滑油(EHL ) 当模特儿性能被完成。结果证明适用的失败在高温度和低旋转速度的情况中来自差的油电影厚度，它导致接触穿。因此经由改进润滑油改进适用的生活的各种各样的途径被比较。它被证明了减少两接触身体的表面粗糙是一个有效方法。

英文摘要：

In order to confirm the early failure cause of a four-row cylindrical roller bearing at the backup roll position of a six-high cold sheet mill, its lubrication behavior under harsh operating conditions is investigated. Through establishing and solving the Elastohydrodynamic Lubrication （EHL） model of the roller-inner raceway contact region, the minimum oil film thickness and the real lubrication performance are achieved. The results show the bearing failures come from the poor oil film thickness in the case of high temperature and low rotational speed, which leads to contact wear. So various approaches to improve bearing life via improving lubrication are compared. It has been proved decreasing surface roughness of both contact bodies is an effective way.