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The common failure modes and mechanism of high temperature bearing are summarized

Release time: May 30, 2018 16:07:00 reading: second

Such problems are often encountered in the use of bearings, that is, the bearings are qualified after testing, but the bearings are stuck or early stalling failure occurs after installation. The main performance is the sense of rotation stagnation, serious spalling of working face, serious wear of cage and even distortion and fracture. The analysis of failure results shows that there are not many quality problems of bearing itself, most of which are caused by improper installation and use. Therefore, the common failure mode and mechanism of high temperature bearing are summarized in order to play a role in attracting jade.

The failure mechanism of bearing is as follows

1. Contact fatigue failure

Contact fatigue failure refers to the failure of bearing working surface under the action of alternating stress. Contact fatigue spalling occurs on the bearing working surface and is often accompanied by fatigue cracks. Firstly, it occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes, such as pitting corrosion or pitting spalling, and spalling into small flakes is called shallow spalling. Due to the gradual expansion of the spalling surface, which often extends to the deep layer, {todayhot} forms deep spalling. Deep spalling is the fatigue source of contact fatigue failure.

2. Wear failure

Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage of bearing parts, and eventually lead to loss of bearing dimensional accuracy and other related problems. The wear may affect the shape change, increase the fit clearance and the change of the working surface morphology, and may affect the lubricant or make it pollute to a certain extent, resulting in the complete loss of the lubrication function, so that the bearing loses the rotating accuracy and even can not operate normally. Wear failure is one of the common failure modes of all kinds of bearings, which can be divided into common abrasive wear and adhesive wear.

Abrasive wear refers to the wear caused by the relative movement of the contact surface caused by the external hard particles or hard foreign matters or metal surface between the bearing working surfaces, which often causes furrow like scratches on the bearing working surface. Hard particles or foreign matters may come from the main engine or other adjacent parts of the host system, which are sent into the bearing by lubricating medium. Adhesive wear refers to the uneven stress on the friction surface caused by micro protrusion or foreign matters on the friction surface. When the lubrication conditions are seriously deteriorated, local deformation of the friction surface and friction micro welding phenomenon are easy to occur due to local friction. In severe cases, the surface metal may be partially melted, and the force on the contact surface will tear the local friction welding point from the matrix and increase the plastic deformation. This cycle of adhesion tear adhesion constitutes adhesive wear. Generally speaking, slight adhesive wear is called scuffing, and severe adhesive wear is called bite.

3. Fracture failure

The main causes of bearing fracture failure are defects and overload. When the external load exceeds the material strength limit, the part fracture is called overload fracture. The main cause of overload is the sudden failure of the host or improper installation. The defects of bearing parts such as microcracks, shrinkage cavities, bubbles, large pieces of foreign debris, overheated tissue and local burns will also cause fracture at the defects when the impact overload or severe vibration occurs, which is called defect fracture. It should be pointed out that the above defects can be correctly analyzed by instruments in the process of bearing manufacturing, such as re inspection of raw materials, quality control of forging and heat treatment, and control of processing process, and the control must be strengthened in the future. But generally speaking, the most common bearing fracture failure is overload failure.

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