Bearing run laps of a variety of reasons?

Bearings run laps means rolling bearing and its relative sliding shaft or hole happened. One, fault phenomenon: bearing parts of the temperature on the high side, big vibration. Open the look, shaft, bearing inner ring surface scratches, even shaft or hole groove of the surface grinding. From this kind of situation has been concluded that bearing run laps. Bearing run laps of the negative effects on the equipment very large and mating part wear, and even subscription fee, damaged equipment, reduce the machine precision, in addition, the increase of friction, put a lot of energy into useless heat and noise, reduce the efficiency. So, appear this kind of circumstance, should according to the actual situation, arrange the repair as soon as possible. Second, run laps: bearing and shaft ( Hole) To cooperate, for shaft and hole, the machining accuracy of bearing, tolerance, material, installation, assembly precision, and the use of maintenance requirement is very strict, what is bad is likely to run laps. 1, the fit tolerance: bearing and shaft ( Hole) Fit tolerance has a strict standard of different specifications, precision, force, and using the environment such as different to fit tolerance requirement. Rolling body and bearing inner and outer friction into rolling friction, the friction coefficient of two contact surfaces are very small, the friction force is very small, When rolling body and suites have oil inside and outside, will be a smaller friction coefficient) 。 Bearing and shaft ( Hole) Fit is very tight, generally for surplus to cooperate, a few conditions for transition fit. Mutual extrusion pressure is bigger, generate static friction, static friction is greater than the relative sliding torsion, make them so can maintain relatively static bearing and shaft and hole, and by rolling body and inner sleeve ( Or between coat) The rotation of the mechanical energy. If the fit tolerance of bearing and shaft and hole slants big, for clearance fit, the decrease of extrusion, the axis ( Bearing) Can under the effect of torsion, the damage to each other in the stillness, slide, we call it 'run laps phenomenon' happened, bearing inner ring with the axial sliding said within laps, sliding bearing outer ring and bearing hole happen according to run outside. : 2, machining precision and installation accuracy refers to the shaft, bearing, bearing hole processing, the precision of the surface roughness, installation, assembly and other technical parameters. These countries also have industry standards. Once was not up to standard, will affect the fit tolerance, cause bearing run laps. Shaft, bearings with a surface is very smooth, roughness Ra 1 or less. 6 microns, if more than this, in the process of bearing the dismantling of the burr to pull off, causing shaft and hole, fit clearance, reasonable tolerance matching conditions are destroyed. Such as, installation of coaxial degree is insufficient, can make large bearing vibration, shaft bending, load is bigger, cause, increase the number of replacement of bearings, bearing failure of bearing and shaft or hole size tolerance, and destroyed it with axis ( Hole) The fit tolerance, all of this is likely to cause bearing run laps and bearing failure. 3, shaft, bearing material is also very critical. Different kinds of bearings should be compatible with the bearing steel manufacturing, strength, stiffness, better wear resistance, the friction coefficient of bearing alloy, to guarantee the normal use of bearings, reducing the possibility of a run laps. 4, daily maintenance: ( 1) Coupling and worn parts, alignment, concentricity error can destroy installation. （ 2) Mother bearing lock parts, such as lock, card ring, end cover lock does not reach the designated position, such as matching precision bearing. （ 3) Bad lubrication, the increase of ball bearing wear, higher temperature, bearing and uneven thermal expansion of the mating parts, and with precision. （ 4) Bearing when disassembling, or damaged shaft bearing, destroy the fit precision. （ 5) Bearing the anchor bolts is not good, causing vibration, is also the cause of the damage to the bearings.