1. Characteristics

Backing bearings are mostly used on multi-roll cold mill with thick wall of outer ring and are ideal backup bearings of multi-roll cold mill. They have the advantages of simple geometric shape, high manufacturing precision and high radial bearing capacity. Structure type without retaining side and retaining ring is not allowed to bear axial load. Axial load is born by adjusting washer at both ends or thrust bearings. Most of them are used on rolling stainless steel and Si-steel strip multi-roll mill. In recent years, because of development in eight-roll mill, common wide and thin plate rolling mill also uses backing bearings as backup bearing, which widen use scope of backing bearings. Because radial load born by backing bearings is very big, outer ring of bearing must have enough strength, to avoid fracture and deformation of race caused by rolling force.

2. Tolerance of bearing

Wall of outer ring for backing bearings is very thick, main tolerance precision requires wall thickness difference. Group according to wall thickness difference of bearing when used in group. Backing bearings produced by WZZZ can be grouped in P5 grade, P4 grade and P2 grade according to standard of ISO492. Grouping tolerance for each group of wall thickness difference can be regulated in production protocol of user. Please consult technical service department of WZZZ for grouping tolerance of backing bearings.

3. Lubrication of bearing

Backing bearings also can be lubricated through using oil which was for cooling roller: viscosity of oil should be 8～12mm2/S at40℃. Oil and water mixture also can be used for lubricating, but it must be strictly filtered, to be in accordance with requirement on cleanliness lubricating oil of bearing.

4. Maintenance and recycling

For backing bearings, because wall for outer ring is very thick, it is allowed to be reused after repaired when appearance of outer ring and raceway for bearing are fatigued.