Installation and maintenance of the rolling mill bearings

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A mill bearing installation

Rolling mill bearing life, not only with the quality of the bearings, use is closely related to its installation. This should pay attention to the technical requirements of bearings installed to comply with the operating proced ures.precision ball bearing

1, pre-installation preparation

(1) prior to installation, each with cooperation should be carefully examined to check the technical requirements of its size, shape, location accuracy and compliance with the public cover design, including the mating surfaces of the roll neck bearings boxes, bearing rings and bearing lid in .
(2) cooperates with the bearing surface of the roll neck, the bearing housing hole and the hole edges and burrs must be removed and cleaned coated with oil.

2, four cylindrical roller bearings installed

(1) installation labyrinth ring (waterproof case)

Labyrinth ring and roll neck with generally tight moving with the need to install a brass rod gently knocked into. The labyrinth Rui surface must be parallel and close fit body shoulder and the shaft and the bearing inner ring.roll bearings

(2) Install the inner ring

The inner ring of four cylindrical AIDS bearings and roll neck with the interference fit, should be installed first inner ring is heated to 90-100 ° C. Do not exceed 120 ° C in order to prevent the inner ring cooling after retraction is not complete. Heating method can be used sump heating induction heating can also be used, the absolute prohibition of open flame heating.

The inner diameter with a sump heating increase amount calculated by following formula:

â–³ d = 12.5 × 10-6 â–³ t.d

Wherein: â–³ D - inner ring inner diameter after heating, the increase amount (mm)
â–³ t - oil temperature and the room temperature differential (° C), at room temperature standard is 20 ° C.
d - Inner diameter (mm)

FCD type double inner ring is installed in the cooling process in the inner ring axially to the inner ring and the inner ring, the inner ring fitted along with the end face of the labyrinth ring, and tested with a feeler.

(3) Install the outer ring

The four cylindrical roller bearing outer ring and housing bore generally transition with smaller bearings outer ring and rollers keep the overall frame with brass rod gently knock chock. For larger bearings, the outer or holding the shelves equipped with a lifting hole, the outer ring and the outer ring assembly is lifted vertically downward load bearing box.

With live wall FCDP four cylindrical roller bearings, its side retaining ring, outer ring components in retaining ring, the same type of bearing should not interchangeable.

The end face of the outer ring to fight â… , â…¡, â…¢, â…£ mark is the mark of the load area. Aligned â…  labeled markers when the first installation, so that the direction of the rolling load, allows rolling load after cleaning and reloading in turn aligned with the rest of the marker mark to extend the service life of the bearing.


3, the installation of the thrust bearing (positioning)

Four points following a corner bearing thrust bearings, double row (single row) angle corner bearing, bi-directional thrust tapered and cylindrical roller bearings, recently the company has also developed a brake roller bearing force bearing.china bearing manufacturer

Four points following a corner bearing, double (single) row angular contact ball bearings used as a thrust bearing, are not allowed in the radial loads, so the housing bore corresponding to the assembly of these parts of the bearing diameter than the bearing outer large diameter of about 0.5 mm. Or roller diameter is smaller than the bearing inner diameter of about 0.5 mm.

The four-point contact ball bearings, installation Never separation circle of the same type are int erchangeable, so as to prevent the change of the axial clearance factory.

The way thrust tapered roller or bi-directional thrust cylindrical roller bearings septum circle, the same model bearing Never interchangeable, to prevent the change of the axial clearance factory.

When the installation of the end face of the thrust bearing inner ring must be pressed and axial to lock. In order to avoid the roll neck relative rotation, caused by the wear of the mating face of the roll neck, burns.

The use of brake roll axial force bearing is axially positioned through the two bearing boxes, and adjusting the axial clearance. Install the bearing housing, should ensure that the bearing inner and outer rings and main bearings, inner and outer rings snapping. When the rack the axial fixed on both sides bearing box, pay attention to the elimination of the axial movement of the bearing housing to the shaft end direction will be generated in the process of bot h sides of the bearing housing to the rack import.