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How do steel wire ropes generally wear out? Need to pay attention to
2021-10-19
Wire rope wear generally includes external wear, internal wear, and deformation wear.
External wear is the wear caused by the contact of the wire rope with the slippery surface, the wall of the drum, the hook head and other surfaces. After the external wear, the diameter of the rope will become thinner, the outer thin steel wire is also smoothed, and the strength of the wire rope is also reduced. The cross-section of the externally worn wire rope is reduced, and the breaking force of the wire rope is also reduced accordingly. The deformation of the wire rope caused by vibration and collision, and the deformation caused by friction is called deformation wear, which is a kind of local wear phenomenon. The wire rope on the surface of the wire rope is impacted by other hard objects, such as the surface of the reel, and the wire rope entangled by the crane will cause the wire rope to deform and wear. If the wire rope is cut, the rope diameter does not decrease, but the width changes greatly, which makes the local steel wire hardened, which is easy to break and cause accidents. In the course of use, the pressure of the steel wire rope when passing through the reel or sliding is pressed on one side of the steel wire rope. The pressure of the steel wire is different, and the radius of curvature can not be exactly the same. At the same time, due to the bending of the steel wire rope, the internal fine steel wires will generate force and slip. At this time, the contact stress between the strands increases, causing the steel wires between adjacent strands to produce local indentations and deep depressions. When repeated cyclic stretching and bending, stress concentration occurs in the deep recesses and is broken, which constitutes internal wear. Generally, the pressure on the surface of the thin steel wire is proportional to the pressure on the wire rope. Under the same tension, due to the different pressure area, The pressure per unit area is also different. |
