Working nature and types of roller bearings in cold rolling mills

Aug 06, 2021

The rolling bearings used on rollers are mainly include double-row tapered roller bearings, four-row tapered roller bearings and multi-row cylindrical roller bearings. Needle roller bearings are only used in rare cases for work rolls.They are used to support the rolling roll and keep the roll in the correct position in the stand, and are an important part of the stand of cold rolling mill. Compared with general bearings, roller bearings have the following special working properties:

1) The unit load is large: because the outer size of the bearing seat should not be greater than the minimum diameter of the roller body, and the length of the roller neck is short, the unit pressure of the roller bearing is 2-4 times or higher than that of the general bearing. And the elevation value (the product of bearing unit pressure and linear velocity) is 3-20 times that of ordinary bearings.

2) Big difference in operation speed: different types of cold rolling mills have great difference in operation speed. The export speed of modern high-speed six-stand tandem cold mill has reached 42m/s, and the export speed of finished stand of 45° wire mill has reached more than 120m/s. The rolling speed of low-speed rolling mill is only 0.2m/s. For such a great difference in speed, of course, different forms of bearings should be selected FV.

3) Bad working environment: all kinds of cold rolling mills should be cooled by water, and the oxide sheet splash; Cold rolling mill should use emulsion or other rolling oil to lubricate and cool rolls and rolled parts during rolling. This process lubricant can not be mixed with bearing lubricating oil. Therefore, the sealing requirements for the bearings are higher.

The above is the nature and type of cold mill roll bearings. FV bearings are strictly controlled from material selection, production process, assembly and testing in the production of rolling mill bearings, such as four rows tapered, four rows cylindrical, standby liner bearings and self-aligning roller bearings, so as to ensure the quality and life of bearings.