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Analysis of common classification of bearing failure classification
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1. Touch fatigue failure Touch fatigue failure refers to the effect of the alternating stress on the bearing work surface. The touch fatigue occurs in the bearing operation; it is often accompanied by fatigue cracks; firstly, the maximum alternating shear stress occurs below the touch surface. Then expand to the appearance of a different shape of the shedding; if the point is pitting or pitting, the shallow part of the surface is broken off. Because of the gradual enlargement of the exfoliated surface; it tends to expand deeper; Deep detachment is a source of exhaustion that touches fatigue failure.
2. Wear and failure Wear and tear refers to the failure of the relative sliding between the appearances to cause the wear and tear of the working exterior metal. The continued wear will lead to the gradual damage of the bearing parts; and the end will lead to bearing dimensional accuracy loss and other related problems. Wear can affect To the shape change; the cooperation gap is increased and the operation appearance is modified; the smoothing agent can be affected or the pollution reaches a certain extent to form a smooth loss of smooth function; thus the bearing loss rotation accuracy can not even operate normally. Wear failure is all kinds of bearings One of the common failure modes; the wear mode is generally divided into the most common abrasive wear and adhesive wear.
Abrasive wear refers to the wear of foreign solid particles or hard foreign objects or metal surface between the outer surface of the bearing bearing operation and the wear caused by the relative movement of the outer surface; often the furrow-like scratch is formed 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. Adhesive wear refers to uneven force on the conflict surface due to conflicting microscopic bumps or foreign matter; When the weather is severely deteriorated; heat is generated due to partial conflict; it is easy to form the surface deformation and conflict micro-welding appearance; when the surface is severe, the surface metal can be partially melted; the force on the touch surface will tear some of the conflicting solder joints from the substrate to increase Plastic deformation. This adhesive tearing adhesion process constitutes adhesive wear; in general; fine adhesive wear is called scratch; severe adhesive wear is called bite.
3. The main cause of cracking failure of imported bearing bearing cracking is the two major factors of shortcomings and overload. When the applied load exceeds the data strength limit, the cracking of the part is called overload cracking. The overload is caused by the host's sudden fault or the device is not proper. Cracks, shrinkage cavities, air bubbles, large foreign objects, overheating arrangements and partial burns, etc., also cause cracking at the disadvantages during impact overload or severe oscillation; called cracking. It should be pointed out; the bearing is in the process of production; The original data can be re-inspected, the quality control of casting and heat treatment, and the processing of the process can be correctly analyzed by the instrument to determine whether the above defects can exist; in the future, the control must be strengthened. However, in general, the general failure of bearing cracking is mostly Overload failure.
4. The clearance changes the imported bearing bearing 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 formation of "biting death" is called the clearance modification failure. The external factors such as excessive interference The device is not in place; the large amount of expansion caused by temperature rise, instantaneous overload, etc.; the connotation elements such as residual austenite and residual stress are unstable, which are the primary reasons for the failure of the play change.
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