In the previous article, we analyzed several factors that lead to the damage of cold rolling mill bearings, and this article introduces the corresponding improvement measures.

After understanding the bearing and the corresponding use environment, we can analyze the cause of bearing failure. Through multiple comparisons and observations of rolling mill bearings, it is concluded that the following factors can cause bearing damage.

Generally speaking, the design service life of the rolling mill bearings of strip mills is 3000-5000h, but in actual use, the service life of the bearings is far from reaching this goal. Steel manufacturers often suffer heavy economic losses due to premature failure of bearings, and among them, machine damage caused by the bonding of bearing inner rings and roll necks is even more costly. So, how to choose the right rolling mill bearing for the steel mill?

The internal structure of thin section crossed cylindrical roller bearings adopts the arrangement of rollers vertically crossed at 90°, and a single bearing can simultaneously withstand the joint action of radial force, bi-directional axial force, and tilting moment. Installing shims or spacers between the rollers can prevent the rollers from tilting or the rollers from grinding against each other and effectively prevent the increase of friction torque. In addition, the structure of vertical cross-arrangement of the rollers can avoid the phenomenon of roller clamping; at the same time, because

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Four-row tapered roller bearings are the one kind of roll neck bearings, their radial and axial loading capacity are high, can carry heavy axial loads in two directions, and their radial loading capacity is 3 times heavier than singe-row tapered roller bearings, but limiting speed is lower. They can be used as axial locating bearings in two directions because they are able to limit axial displacement in two directions within axial clearance. The radial and axial clearance also can be adjusted by changing the width of spacer between inner and outer rings.