What Is The Preload Of Timken Rolling Bearing?
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A Simple Method To Distinguish True And False Skf Bearings
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Five Fault Rules For Plain Bearings

Plain Bearings

1) Tile surface corrosion: abnormal concentration of non-ferrous metal elements is found by spectral analysis; Plain Bearings Submicron wear particles with many nonferrous metal components appear in ferrography; The water content and acid value of lubricating oil exceed the standard.

2) Journal surface corrosion: abnormal iron concentration is found by spectral analysis. Plain Bearings There are many submicron particles of iron in the ferrogram, and the moisture or acid value of lubricating oil exceeds the standard.

3) Journal surface strain: there are ferrous cutting abrasive particles or black oxide particles in the Plain Bearings ferrogram, and there is tempering color on the metal surface.

4) Fretting wear of pad back: abnormal iron concentration is found by spectral analysis. Plain Bearings There are many iron components, submicron wear particles, abnormal moisture and acid value of lubricating oil in the ferrogram.

5) Bearing surface strain: cutting abrasive particles are found in ferrography, and the Plain Bearings abrasive particles are composed of non-ferrous metals.

Five Fault Rules For Plain Bearings

We all know that many imported bearings will fail. Many users of imported bearings have this situation. Why? Plain Bearings The failure of imported bearings has become a new problem for us. We need to find all ways to solve this problem. What is the solution?

This problem is so difficult to solve. Of course, it is difficult to solve. Imported bearings are easy to fail This is a common problem when we use imported bearings After the bearing runs for a period of time, it is necessary to check whether there are problems, especially whether it fails. Plain Bearings Today I will tell you the failure classification of imported bearings.

1. Contact fatigue failure

Contact fatigue failure refers to the failure of bearing working surface under the action of alternating stress.Plain Bearings  Contact fatigue spalling occurs on the working surface of the bearing and is often accompanied by fatigue cracks. It first 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 or pitting spalling, which is called shallow spalling.

Due to the gradual expansion of the spalling surface, it often expands to the deep layer, Plain Bearings forming 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 Plain Bearings gradual damage to bearing parts, and eventually lead to loss of bearing dimensional accuracy and other related problems.

Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting Plain Bearings in the complete loss of lubrication function, resulting in the loss of rotation accuracy and even normal operation of the bearing.

Wear failure is one of the common failure modes of various bearings. According to the wear form, it can be divided into common abrasive wear and Plain Bearings adhesive wear.

Abrasive wear refers to the wear caused by the relative movement of the contact surface due to the extrusion of foreign hard particles or hard foreign matters or wear debris on the metal surface between the working surfaces of imported bearings, Plain Bearings which often causes furrow like scratches on the working surfaces of bearings. Hard particles or foreign matters may come from the inside of the host machine or from other adjacent parts of the host system and are sent into the bearing by the lubricating medium.

Adhesive wear refers to the uneven stress on the friction surface due to the micro bulge or foreign matter on the friction surface. When the lubrication conditions are seriously deteriorated, the local deformation and friction micro welding of the Plain Bearings friction surface are easy to be caused due to the heat generated by local friction.

In serious cases, the surface metal may be locally melted, and the force on the contact surface will tear the local friction welding point from the substrate and increase the plastic deformation. This cyclic process of adhesion tear adhesion constitutes adhesive wear. Generally Plain Bearings speaking, slight adhesive wear is called scratch and severe adhesive wear is called bite.

3. Fracture failure

The main reasons for the fracture failure of imported bearings are defects and overload. When the external load exceeds the material strength limit and causes the part to break, it is called overload fracture. Overload is mainly caused by sudden failure or improper installation of the host.

Defects such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissue and local burns of bearing parts will also cause fracture at the defect during impact overload or severe vibration, which is Plain Bearings called defect fracture.

It should be pointed out that in the manufacturing process of bearings, the presence of the above defects can be correctly analyzed by instruments in the factory re inspection of raw materials, quality control of forging and heat treatment, and processing process control, Plain Bearings and the control must still be strengthened in the future. But generally speaking, most of the bearing fracture failures are overload failures.

4. Clearance change failure

During the operation of imported bearings, due to the influence of external or internal factors, the original matching clearance is changed, the accuracy is Plain Bearings reduced, and even “bite” is called clearance change failure.

External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as Plain Bearings residual austenite and residual stress in an unstable state are the main causes of clearance change failure.