Causes of artificial bearing rupture

The more common cause of bearing rupture is man-made. For example, hard knocking during disassembly and assembly and hard particle impurities invading the interior of the bearing may cause the inner and outer rings and cages to crack. The clearance adjustment of tapered roller bearing is too tight, which usually breaks at the big end of tapered roller; If the clearance is adjusted too much, it usually breaks at the small end of the conical roller. There are two kinds of bearing rupture, one is the rupture caused by fatigue, the other is the rupture caused by improper installation.
(1) Bearing parts bear great alternating load due to fatigue. Due to material defects of plastic bearings or other reasons, stress concentration occurs in a certain part of the bearing. When the stress is greater than the strength limit, small cracks will occur there. The continuous action of alternating load and the action of oil wedge of lubricating oil lead to the continuous expansion of cracks. When the cracks expand to a certain extent, they will break.
(2) Corrosion forms dark black spots and ulcers on the surface of bearing parts. The main causes of corrosion are:
(1) Moisture or moisture is immersed inside the bearing.
(2) The use of lubricants with poor properties can also cause corrosion.
(3) Another kind of corrosion is called contact corrosion, which mainly occurs on the contact surface between the non rotating inner and outer rings and the rolling element.
Other injuries in addition to the above injuries, there are other injuries.
(1) Spark melting, such as current passing through the bearing, causes sparks at the contact point between the raceway and the rolling element through a very thin oil film, resulting in local surface melting and pits on the raceway. These small pits gradually expand due to wear, resulting in the destruction of the whole bearing.
(2) Sliding, oxidation and grinding when the bearing does not rotate, it is vibrated by nearby punches and air compressors or the protective measures are not good during transportation, resulting in relatively repeated small sliding between the rolling element and the inner or outer ring, causing some small particles to fall off from the surface. Once oxidized, these small particles can become abrasives and accelerate the wear of the contact surface. Increase the bearing noise and affect the normal operation of the equipment.
(3) Unreasonable design and unreasonable design structure cause bearing damage; If the outer ring is fastened with set screw on the bearing seat or the groove is ground on the bearing, it will cause local stress concentration and fracture the raceway.
(4) The cage is damaged. The bearing cannot be used due to wear, breakage and fracture of the cage.
(5) Residual magnetism adsorption the shaft is damaged due to the adsorption of metal debris caused by residual magnetism.