1. Fatigue peeling: The inner and outer raceways and rolling body surfaces of the scaffolding rotating fastener 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 body will cause surface wear, and poor lubrication will also aggravate wear. As a result of wear, the clearance of the scaffolding fastener increases, the surface roughness increases and the operation accuracy of the scaffolding fastener is reduced, thereby reducing the movement accuracy of the machine, and the vibration and noise also increase. For scaffolding fasteners, it is often the amount of wear that limits the life of the fasteners.
3. Plastic deformation: When the scaffolding fastener is subjected to excessive impact load or static load, or additional load caused by thermal deformation, or foreign objects with high hardness invade, dents or scratches will be formed on the raceway surface. This will cause the scaffolding fastener to produce violent vibrations and noise during operation. Moreover, 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 scaffolding rotating fasteners. Scaffolding fasteners may not continue to work due to loss of precision caused by surface rust. Direct intrusion of moisture or acidic and alkaline substances will cause rust on scaffolding fasteners. When the scaffolding fastener stops working, the temperature of the scaffolding fastener drops to the dew point, and the moisture in the air condenses into water droplets attached to the surface of the scaffolding fastener, which will also cause rust. In addition, when there is current passing through the inside of the scaffolding fastener, the current may pass through the contact points on the raceway and the rolling element, and the thin oil film will cause electric sparks and produce electro-erosion, forming a washboard-like uneven surface.
5. Fracture: Excessive load may cause the scaffolding fastener parts to break. Improper grinding, heat treatment, and assembly will cause residual stress. Excessive thermal stress during operation will also cause the scaffolding fastener parts to break. In addition, improper assembly methods and assembly processes may also cause the scaffolding fastener ring ribs and roller chamfers to fall off.
6. Gluing: When working under poor lubrication, high speed, and heavy load conditions, due to frictional heat, the scaffolding 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 one 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 unable to roll. It may also cause friction between the cage and the inner and outer rings. This damage will further aggravate vibration, noise, and heat, leading to damage to the scaffolding fastener.
Post time: May-16-2025