Several manifestations of the impact of small rod ends bearing erosion on life

Bearings are corroded in different ways due to different use environments. Rod end bearings are also subject to corrosion. Here are three ways that small rod ends bearings are corroded.

1. Cavitation
Cavitation of small rod ends bearings is a form of surface damage caused when a solid surface contacts a liquid and moves relative to it. When the lubricating oil is in the low-pressure area of ​​the oil film, bubbles will form in the oil. After the bubbles move to the high-pressure area, they collapse under the pressure. At the moment of collapse, they generate a huge impact force and high temperature. Under the repeated impact of this impact force, the solid surface fatigues and falls off, causing small pits on the friction surface, which then develop into sponge-like scars. Cavitation often occurs in heavy-load, high-speed, and large load and speed variation sliding bearings;

2. Fluid erosion
The fluid erosion of small rod ends bearings refers to the erosion caused by the violent impact of the fluid on the solid surface, which causes point-like scars on the solid surface. This damaged surface is relatively smooth;

3. Electrical erosion
The electrical erosion of small rod ends bearings refers to the electric sparks generated between the friction surfaces of the rod end joint bearings due to leakage of the motor or electrical appliances, which causes point-like scars on the friction surface. Its characteristic is that the damage reciprocates on the harder journal surface.

In order to predict the fatigue life of rolling bearings and determine the remaining life, it is necessary to understand all bearing fatigue damage phenomena, which will take a long time. However, since rolling fatigue occurs under the compressive stress of the contact point, a great material change will occur to achieve damage.

Therefore, in addition to the early cracks on the surface, the raceway is chemically affected, and the crack extension precedes the material change, the fatigue of the rod end joint bearing can be determined by detecting the material change.

The fatigue of small rod ends bearings can be determined by measuring the residual stress, half width of the diffraction line, and the change in the amount of retained austenite on the raceway surface using an X-ray machine.

These values ​​will change as fatigue intensifies. Since the residual stress will increase and approach the saturation value at the beginning of fatigue, it can be used to detect mild fatigue, but in the section with greater fatigue, the change in the half width of the diffraction line and the retained austenite is related to the increase in fatigue. By summarizing these X-ray test values ​​into an index (fatigue index), the relationship with the bearing endurance test time is found.

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