1. Fatigue peeling: The inner and outer raceways and rolling element surfaces of the rotating fasteners of the scaffolding bear loads and roll relative to each other. Due to the action of alternating loads, cracks are first formed at a certain depth below the surface (at the maximum shear stress), and then expand to the contact surface to cause peeling pits on the surface, and finally develop into large-scale peeling. This phenomenon is fatigue peeling. Fatigue peeling will cause the impact load, vibration, and noise to increase 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 aggravate wear. As a result of wear, the clearance of the fastener increases, the surface roughness increases, and the running accuracy of the fastener is reduced, thereby reducing the movement accuracy of the machine, and the vibration and noise also increase. For precision mechanical fasteners, it is often the amount of wear that limits the life of the fastener.
3. Plastic deformation: When the fastener 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 raceway surface. This will cause the fastener to produce violent vibration and noise during operation. And once there is an indentation, the impact load caused by the indentation will further cause the nearby surface to peel off.
4. Rust: Rust is one of the most serious problems of the rotating fasteners of the scaffolding. High-precision fasteners may not be able to continue working due to surface rust and loss of precision. Direct intrusion of moisture or acidic and alkaline substances will cause fastener rust. When the fastener stops working, the temperature of the fastener drops to the dew point, and the moisture in the air condenses into water droplets attached to the surface of the fastener, which will also cause rust. In addition, when there is current passing through the fastener, the current may pass through the contact points on the raceway and the rolling element, and the very thin oil film will cause electric sparks and produce electric corrosion, forming a washboard-like uneven surface.
5. Fracture: Excessive load may cause fastener parts to break. Improper grinding, heat treatment, and assembly will cause residual stress, and excessive thermal stress during operation will also cause fastener parts to break. In addition, improper assembly methods and assembly processes may also cause the fastener ring ribs and roller chamfers to fall off.
6. Gluing: When working under poor lubrication, high speed, and heavy load conditions, due to friction and heat, the fastener parts can reach a very high temperature in a very short time, resulting in surface burns and gluing. The so-called gluing refers to the phenomenon that the metal on the surface of a component adheres to the surface of another component.
7. Cage damage: Improper assembly or use may cause the cage to deform, increase the friction between it and the rolling element, and even cause some rolling elements to get stuck and be unable to roll. It may also cause friction between the cage and the inner and outer rings. This damage will further increase vibration, noise, and heat, leading to fastener damage.
Post time: Jul-10-2025