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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge> Failure analysis of imported bearings Failure analysis of imported bearings
We often receive a lot of questions from users who use imported bearings after consulting the bearing for a period of time. In fact, after the bearing operation for a period of time; we have to check to see if the bearing can fail. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. Insufficient wear of imported bearings <br> Regardless of the use of SKF bearings; the use of NSK or FAG bearings has the appearance of wear and failure; wear failure refers to the relative sliding conflict between the appearances, resulting in the failure of the wear of the surface of the work metal Continued wear will lead to gradual damage to the bearing parts; and at the end of the bearing scale loss of precision and other related problems. We all know that general wear can affect the shape changes; can affect the smoothing agent or make it reach a certain level of pollution Smooth function is completely lost; the end of the bearing loss rotation accuracy can not even work properly. Wear failure is a common appearance of various types of bearings.
According to the wear method, it can be generally divided into the most common adhesive wear and abrasive wear:
A sticky wear means that the conflicting surface is unevenly stressed due to the microscopic bulging or foreign matter in the conflict; when the smooth condition is severely deteriorated; the heat is partially generated by the conflict; and the surface deformation and the conflict microscopic welding are formed; When the metal is severe, the surface metal can be partially melted; the force on the touch surface tears some of the conflicting solder joints from the substrate to increase the plastic deformation. The cyclic process of the adhesive tear adhesion constitutes adhesive wear; in general; fine adhesion Wear is called scratching; severe adhesive wear is called bite.
Two-grain wear refers to the wear of foreign solid particles or hard foreign objects or metal appearance between the outer surface of the bearing bearing operation and the wear caused by the relative movement of the outer surface; often the furry-like scratch on the outer surface of the bearing operation. Hard particles or foreign matter can come from inside the host or other adjacent parts from the host system are fed into the bearing by smooth media.
2. The failure of the imported bearing cracking constitutes the main cause of the cracking failure of the imported bearing. The main reason is the shortcomings and overload. The most common is that the applied load exceeds the data strength limit and the component crack is called overload cracking.
The main reason for the overload is that the device is not properly installed or the host has a sudden problem. Under normal circumstances, the micro-cracks, shrinkage cavities, air bubbles, large foreign objects, overheating arrangements and partial burns of the bearing parts may also be affected by impact overload or severe oscillation. In the shortcomings, it causes cracking; we call it a crack.
For this reason, we need bearings in the production process; strict inspection of the original data; good first pass. Then there are casting and heat treatment quality control, processing process control can be correctly analyzed through the instrument whether the above shortcomings exist; Control must be strengthened. But in general; the general failure of bearing cracking is mostly overload failure.
3. Imported bearing touch fatigue failure Touch fatigue failure refers to the effect of the bearing work surface subjected to alternating stress and failure. Touch fatigue fall occurs in the bearing work appearance; often accompanied by fatigue crack; firstly from the touch surface below the maximum alternating shear stress Occurs; then expands to the outer surface to form a different shape of the shedding; if the point is pitting or pitting, the shallow layer is peeled off due to the gradual expansion of the exfoliated surface; Deep detachment. Deep detachment is the source of fatigue that touches fatigue failure.
4. Imported bearing clearance changes the imported bearings in the operation; because of the influence of the external or connotation elements; the original cooperation gap is changed; the accuracy is reduced; even the "bite death" is called the clearance modification failure. The external factors such as the excess Large; the device is not in place; the temperature rise causes a large amount of expansion, instantaneous overload, etc.; connotation elements such as residual austenite and residual stress are unstable, which are the primary reasons for the failure of the play change.
The above problems only need to be noticed, it will greatly reduce the occurrence of bearing failure.
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Failure analysis of imported bearings
Source: Bearing network time: 2018-02-07