The four primary reasons for NTN bearing failure
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The four primary reasons for NTN bearing failure
Source: China Bearing Network Time: 2018-05-24
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2, NTN bearing wear failure wear failure refers to the relative sliding conflict between the appearance of the appearance of the failure of the operation of the surface of the metal wear and tear. Continued wear will lead to the gradual damage of NTN bearing parts; and the end of the NTN bearing scale accuracy loss and other Related problems. Wear can affect the shape change; the cooperation gap is increased and the work appearance is modified; the smoothing agent can be affected or the pollution can reach a certain degree to form a smooth loss of smooth function; thus the NTN bearing loss rotation accuracy can not even work normally. Wear failure is one of the common failure modes of various types of bearings; it can be divided into the most common abrasive wear and adhesive wear according to the wear mode.
Abrasive wear refers to the abrasion caused by the extrusion of foreign solid particles or hard foreign objects or metal appearance between the outer surface of the NTN bearing work, and the wear caused by the relative movement of the touch surface; often forms a furrow-like scratch on the outer surface of the bearing operation. Hard The particles or foreign matter can come from the inside of the host or other adjacent parts from the host system are fed into the NTN bearing by the smooth medium. The common sense of the NTN bearing accuracy error. Adhesive wear refers to the conflict surface due to the microscopic bump or foreign matter of the conflicting appearance. Uneven force; when the smooth condition is severely deteriorated; due to partial conflict heat generation; easy to form part of the conflict surface deformation and conflict micro-welding; when the surface is severe, the surface metal can be partially melted; the touch surface effect will be part of the conflict solder joint Tearing 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, NTN bearing cracking failure NTN 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 suitable. The micro-cracks, shrinkage cavities, air bubbles, large foreign objects, overheating arrangement and partial burns of the parts will also cause cracking in the shortcomings during impact overload or severe oscillation; it is called defect cracking. It should be pointed out; NTN bearing is being produced In the process; the original data re-inspection, casting and heat treatment quality control, processing process control can be correctly analyzed by the instrument whether the above shortcomings can exist; in the future must still strengthen the control. But in general; generally presented NTN bearings Most crack failures are overload failures.
4, NTN bearing clearance change failure NTN bearing in the operation; because of the influence of the external or connotation elements; the original cooperation gap changes; accuracy is reduced; even the formation of "bite death" is called clearance modification failure. External factors such as interference The amount is too large; 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.
1). If the NTN bearing is outstandingly smooth and the proper insulation and moisture are isolated, the oil seal should be free of wear. However, the best way to look at the bearings and view the oil seals is when you open the bearing housing. Look at the oil seal near the bearing; to ensure that they are sufficient to avoid hot liquid or corrosive liquid or gas entering the bearing along the axis; if the oil seal has worn out, it should be replaced quickly.
2). High temperatures often indicate that the NTN bearing is in an abnormal condition. High temperatures are also detrimental to the smoothing agent in the bearing. Sometimes NTN bearing overheating can be attributed to the smoothing agent of the bearing. If the bearing is operated for a long time beyond the temperature of 125 degrees Celsius, the NTN bearing life will be reduced.
The causes of high-temperature NTN bearings include: smooth lack or over-smoothness, magazines in smoothing agents, excessive load, damage to NTN bearings, lack of voids, and high temperature conflicts in oil seals.
3). Check the condition of the running machine; monitor it; avoid forming a device stop.
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