The dangers of bearing box defects

The harm of bearing box defects - 2019 02 - 22 Wu Mengchuan rolling mill bearing is bearing in rolling mill is a kind of support and protection of bearing box body parts. At the same time, the equipment under the axial and radial force at work. In a device with the axis of rotation, the shaft is generally supported by bearing up rotating, bearing is installed in bearing box, axial forces are at work will be passed on to the bearing box, by bearing box bearing. So what's the defect bearing box may cause what consequences? The author to enumerate the personal opinion, if there is any deficiency, please correct me. 1. Whether accord with a standard and the rolling mill bearing box dimension of the gap between memorial arch change will directly affect the stability and precision of the rolling mill control. If the backup roll bearing box and mill arch gap is too big, will lead to the backup roll and work roll cross contact; If the supporting roller line to upper and lower bearing surface distance, will cause the deviation of work roll roll gap, all will cause the workpiece size deviation, process defect, plate type is unqualified, crown value standard products such as quality problems. 2. Bearing box itself size precision problem caused by equipment failure. Backup roll bearing hole alignment with bearing box is bad, will cause the roller body crossed, on work under working on supporting roller, roller, roller and support roller under the line, no longer parallel and existence Angle relationship between the roller body cross light person to influence the surface quality of the product, the person that weigh can produce roll breakage; If the vertical degree and parallel degree of bearing box end face super bad, and then pressure force transfer is not on the top surface and the center of the bearing hole, which will influence the pressure and transmission of the rolling force, acceleration of parts wear and tear, damage the precision of the mill itself. 3. To match problem between bearing housing and bearing bearing failure. Bearing box hole size should be in accordance with the national standard and the bearing fit tolerance design, and the bearing gap is too small to make the bearing assembly is difficult, and assembly easy to scratch the bearing's outer surface and bearing surface of the hole in the cabinet. Clearance is too large, beating in use cause bearing, outer run laps, greatly reduce the service life of the bearing; Bearing installation check box before there are no bumps in the hole. Box hole bumps make bearing in convex point stress increase, and between bearings and roll axis not in a straight line, roll to beat, premature bearing failure; If the bearing box holes elliptic, can cause installed in the casing deformation of bearing outer ring, light affect the bearing clearance, cause the temperature on the high side, or bearing outer ring fracture, causing burning roller.