Main forms of failure of full complement cylindrical roller bearings

1. Fatigue spalling The inner and outer raceways and rolling element surfaces of the full complement cylindrical roller bearing both bear the load and roll relative to each other. Due to the action of the alternating load, cracks are first formed at a certain depth below the surface (the place with the largest shear stress), and then It expands to the contact surface, causing the surface layer to have spalling pits, and then develops to large pieces of spalling, which is fatigue spalling. Fatigue spalling increases shock loads, vibration and noise during operation. 2. Wear Due to the intrusion of dust and foreign matter, the relative movement of the raceway and the rolling element will cause surface wear, and poor lubrication will also increase the wear. As a result of the wear, the bearing clearance increases, the surface roughness increases, and the running accuracy of the bearing is reduced. , which also reduces the motion accuracy of the machine, and the vibration and noise also increase. For precision mechanical bearings, it is often the amount of wear that limits the life of the bearing. 3. Plastic deformation When the bearing is subjected to excessive impact load or static load, or additional load caused by thermal deformation, or when foreign matter with high hardness invades, dents or scratches will be formed on the surface of the raceway. This will make the bearing produce severe vibration and noise during operation. And once there is an indentation, the impact load caused by the indentation can further cause spalling of nearby surfaces. 4. Corrosion Corrosion is one of the most serious problems of full complement cylindrical roller bearings. High-precision bearings may lose precision due to surface corrosion and cannot continue to work. Direct intrusion of water or acid and alkaline substances will cause bearing corrosion. When the bearing stops working, the temperature of the bearing drops to the dew point, and the moisture in the air condenses into water droplets attached to the bearing surface will also cause rust. In addition, when there is current passing through the bearing, the current may pass through the contact points on the raceway and the rolling elements, and the thin oil film causes electric sparks to cause electrical corrosion, forming washboard-like unevenness on the surface. 5. Fracture Excessive load may cause the bearing parts to fracture. Improper grinding, heat treatment and assembly can cause residual stress, and excessive thermal stress during operation can also cause bearing parts to break. In addition, improper assembly method and assembly process may also cause the bearing ring rib and roller chamfer to drop blocks. 6. Gluing When working under the condition of poor lubrication and high speed and heavy load, the bearing parts can reach a very high temperature in a very short time due to friction and heat, resulting in surface burns and gluing. The so-called gluing refers to the phenomenon that the metal on the surface of one part adheres to the surface of another part. 7. The cage is damaged due to improper assembly or use, which may cause the cage to deform, increase the friction between it and the rolling elements, and even cause some rolling elements to be stuck and unable to roll. It may also cause friction between the cage and the inner and outer rings, etc. . This damage can further exacerbate vibration, noise and heat, resulting in bearing damage.

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