In the process of using the NTN bearing failure and treatment method

NTN bearing in the process of using regularity is very strong, and the repeatability is very good. , at the beginning of the use of vibration and noise are relatively small, but there are some scattered of spectrum amplitude is small, may be some error in the manufacturing process, such as surface caused by burrs, etc. Movement after a period of time, maintain a certain level of vibration and noise, frequency spectrum is very single, only one or two times the frequency. More than three times the power frequency spectrum, seldom appears bearing condition is very stable, steady working period. Continue to run late into use, the import bearing vibration and noise began to increase, sometimes a different sound, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value. We believe that the bearing is characterized by the early failure. At this time, requires that the bearing is closely monitoring, pay close attention to the change. Since then, NTN bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate the increase, when the vibration more than standard ( Such as ISO2372 standard) , its bearing kurtosis value also began to increase rapidly, when more than vibration standard, and kurtosis value is more than normal ( Available kurtosis relative standard) When we think of bearing fault has entered the late production, should be timely maintenance equipment, replace the bearing. Late show bearing fault feature to severe fault ( For bearing damage, such as holding shaft commonly, burns, sand spallation, raceway, wear beads, etc. ) Most of time not more than a week, the bigger the equipment capacity, the faster the speed, the shorter the time interval. Therefore, in the actual bearing fault diagnosis, once found late fault characteristics, should be decisive judgment NTN bearing fault, arrange inspection as soon as possible. Use factors mainly refers to install, use, maintenance, maintenance, repair and so on meets the technical requirements. According to the bearing installation, use, maintenance, maintenance of technical requirements, the operation of the bearing on the load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, found that abnormal immediately to find the reason, adjustment, so that it is back to normal. Installation condition is one of the primary factor of use factor, NTN bearing is often caused by improper installation of a complete set of change the stress of bearing between various parts, bearing in the abnormal state of operation and the service life of the early end internal factors mainly refers to the structure design, manufacturing process and material quality and so on three major factors in determining the quality of bearing. Bearing materials of metallurgical quality were the main factors influencing the premature failure of the bearing. As metallurgy technology, For example, the bearing steel vacuum degassing, etc. ) Progress, raw material quality is improved. Raw material quality factor in the bearing failure analysis share has declined obviously, but it is still one of the main influence factors of bearing failure. Select material adequacy is still bearing failure analysis factors must be considered. Bearing manufacturing generally go through forging, heat treatment, cutting, grinding and assembly, and multi-channel processing operations. The rationality of the processing technology, advanced, stability will also affect the service life of bearing. Which affects the quality of finished product NTN bearing heat treatment and grinding process, tend to have a more direct relationship with bearing failure. In recent years the study of metamorphic layer of bearings working surface show that the grinding process and is close to the surface quality of the bearing. Bearing on the analysis of the failure, is based on a lot of background material, analyze data and failure forms, find out the main factors of bearing failure, according to the analysis of the reasons for improvement. Heat lamp or other heating facilities to be able to use. Even wet or not cover contact shelter chemical knuckles of the hand or a large number of can incur seal cutting was once small area, it can cause NTN bearing fatigue. About with close cooperation, or press, or has been locked is once of the central axis, remove bearing drawing machine can't use the machine, the bearing inner ring can be heated, to increase the move. If once a torch, it can change the function of bearing steel and bearing must be abandoned. The use of any bearing life spans are originated in the protection and care for it to absorb large level. Imported bearing deposit have special bearing erosion prevention coatings for choice, but a few bearing no erosion prevention information. Bearing performance can will incur high downtime, infrastructure protection and fault. This includes bearing storage, eliminate and cleansed, and device test. Suitable for resistance of all bearing the idea of conflict. Bearing is there will be a measure of the high humidity or a sudden and violent change, condensation of waters can be incurred. No tube bearing type, careless NTN bearing is particularly necessary is cut off. Bearing no indirect storage are lime earth, are there can be condensed water collecting and bearing. In order to reach high facilities of operation, the protection of the function and low profits firmly must comply with the exact solution. Careless is solved and the storage of the bearing, it is necessary, to ensure that they will not rust or corrode.