The correct assembly relationship of four-row cylindrical roller bearings for rolling mills should be that each set of bearings should be assembled with a specific bearing seat, one or more fixed ends of the rolls, according to the requirements of clearance of four-row cylindrical roller bearings for rolling mills. After the assembly of the bearing, the chock and the supporting parts, and the roll, the parallelism between the working side of the chock and the roll generatrix should be measured and adjusted to ensure that the centerline of the roll is at the same vertical line in the stand.
Since the inner ring of four-row cylindrical roller bearings for rolling mills can be separated, a rolling mill usually has to prepare at least one set of spare rolls. In this way, if strict specifications are not required during use, the actual production process often does not follow the original bearing assembly relationship, especially when there is a problem with one set of bearings, and when the production tasks are busy, managers often ask to disrupt this original pairing relationship. This will seriously affect the correct assembly position of the roll in the stand, and even affect the quality of the rolled products.
After this fixed assembly relationship is broken, the running-in coordination relationship between the rolling elements and raceways will be broken, which will cause serious uneven forces on the rolling elements and raceways. It will cause the bearing to heat up, wear seriously, and appear fatigued pitting prematurely. In the worst case, the rolling elements will break, which will damage the raceways of the inner and outer rings of the bearing, causing the bearing to burn and lock.
damaged roller
damaged raceway
Therefore, the assembly relationship of four-row cylindrical roller bearings for rolling mills is not allowed to be damaged casually. There are many rolling mill factories that do not have a deep understanding of this point, and the damage of four-row cylindrical roller bearings for many rolling mills is caused by this reason.
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