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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The problem of failure classification of NSK bearings Problems related to failure classification of NSK bearings
1. Touch fatigue failure Touch fatigue failure refers to the failure of the NSK bearing operation surface to be affected by alternating stress. Touch fatigue loss occurs in the bearing operation appearance; often accompanied by fatigue crack; firstly from the touch surface, 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 enlargement of the detached surface; and the deep layer is enlarged; Shedding. Deep detachment is the source of fatigue that touches fatigue failure. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
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. The abrasive wear refers to the extrusion of foreign solid particles or hard foreign matter or metal appearance between the outer surface of the bearing operation. Touching the wear and tear caused by the relative movement; often forming a furrow-like scratch on the outer surface of the bearing work. Hard particles or foreign matter can come from inside the host or other adjacent parts from the host system are fed into the bearing from the smooth medium. Adhesive wear system Refers to the fact that the conflicting surface is not stressed due to the microscopic bulging or foreign matter on the surface of the conflict. In the case of severe deterioration of smooth conditions; heat generated due to partial conflict; easy formation of conflict surface deformation and conflict micro-welding appearance; surface metal can be partially melted when severe; touch surface effect tears part of conflict solder joints from the substrate Cracking and increasing plastic deformation. This adhesive tearing process constitutes adhesive wear; in general; fine adhesive wear is called scratch; severe adhesive wear is called bite.
3. Cracking failure bearing cracking failure is the primary cause 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 properly. The micro-crack of the bearing parts, Shrinkage, air bubbles, large foreign objects, overheating arrangements and partial burns will also cause cracking in the shortcomings during impact overload or severe oscillation; called fault cracking. It should be pointed out; the bearing is in the process of production; In the process of re-inspection, casting and heat treatment quality control, processing and processing, the above-mentioned shortcomings can be correctly analyzed through the instrument; the control must be strengthened in the future. However, in general, the bearing cracking failures that are generally presented are mostly overload failures. .
4. NSK bearing is in operation; the influence of the external or connotation elements; the original cooperation gap is changed; the accuracy is reduced; even the formation of "bite death" is called the clearance modification failure. The external factors such as excessive interference are excessive; The device is not in place; the temperature rise causes a large amount of expansion, 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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Source: China Bearing Network Time: 2013-09-25