Several manifestations of the impact of ball bearing rod erosion on life expectancy

Bearings are eroded differently due to different use environments, because the erosion methods are different. Of course, the rod end joint bearing cannot escape the fate of being eroded. Let's talk about the three ways in which the ball bearing rod is eroded.

1. Cavitation
Cavitation of a ball bearing rod is a form of surface damage that occurs when a solid surface is in contact with a liquid and undergoes relative motion. 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, the bubbles will collapse under the action of pressure, and a huge impact force and high temperature will be generated at the moment of collapse. Under the repeated action of impact force, the material will fatigue and fall off, causing small pits to appear on the friction surface, and then develop into spongy scars. Cavitation often occurs in sliding bearings with heavy loads, high speeds, and large load and speed changes;

2. Fluid erosion
The fluid erosion of the ball bearing rod means that the violent impact of the fluid on the solid surface will cause fluid erosion, causing point-like scars to appear on the solid surface, and the surface of this damage is smoother;

3. Electric erosion
The electrical erosion of bearings refers to the electric sparks generated between the friction surfaces of the ball bearing rod due to electric leakage of the motor or electrical appliances, causing point-like scars on the friction surfaces, which is characterized by the damage reciprocating on the harder journal surface.

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

Therefore, in addition to early cracks on the surface, chemical influence on the raceway, and crack propagation prior to material changes, detecting material changes may determine the fatigue of the rod end spherical plain bearing.

The fatigue degree of the ball bearing rod can be grasped by measuring the residual stress of the raceway surface, the half-width of the diffraction line, and the change of the amount of retained austenite by using an X-ray machine.

These values will change as fatigue increases. Since the residual stress will increase at the initial stage of fatigue and approach the saturation value, it can be used to detect slight fatigue. The exacerbation has a certain relationship. Summarize these X-ray test values into an index (fatigue index), and find the relationship with the bearing endurance test time.

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