1. Fatigue peeling: The inner and outer raceways and rolling body surfaces of the rotating fastener bear both loads 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 (shear stress), then extend 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 body 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 fasteners of the scaffolding are subjected to excessive impact loads static loads, or additional loads 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. 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 rotating fasteners. High-precision fasteners may not be able to continue working due to surface rust, resulting in a loss of precision. The 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 electro-erosion, 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 of the scaffolding 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 one component adheres to the surface of another component.
7. Damage to the scaffolding cage: Improper assembly or use may cause the scaffolding cage to deform, increase the friction between it and the rolling element, and even cause some rolling elements to get stuck and unable to roll. It may also cause the scaffolding cage to rub against the inner and outer rings. This damage will further increase vibration, noise, and heat, leading to damage to the fasteners.
Post time: May-20-2025