NTN self-aligning roller bearing failure analysis of the causes of failure

Rolling bearing is a bearing noise itself, namely bearing the inherent noise; The other is a NTN bearing installed before the noise, has nothing to do with the noise of the bearing itself. By listening to sounds can be analyzed out some problems. 一) Inherent noise: roll say all kinds of bearings and rolling friction is rolling bearing inherent noise. Raceway is by the elastic properties of the rolling element and raceway contact, when spherical roller bearing rotating roller rolling on the rolling and send out the voice of a continuous and smooth; B) Tremolo ( All kinds of bearing) C) When the rolling bearing raceway surface or body surface is damaged, pit corrosion, so can produce a certain cycle of noise and vibration. When bearing in operation will produce contamination noise have dust intrusion. This noise is periodically also accompanied by the sound vibration is not fixed, sometimes no. First of all, reasonable structure design and equipped with advanced, just can have a longer NTN bearing life. Self-aligning roller 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 products 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. NTN bearing materials of metallurgical quality were the main factors influencing the premature failure of the rolling 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. The main task of the bearing failure analysis, which is based on a lot of background material, analyze data and failure forms, find out the main factors of NTN bearing failure, so that the improvement measures are put forward, lengthen spherical roller bearing, avoid premature failure of the bearing of the sudden. The vibration of the bearing of NTN bearing failure effect is obvious. Such as peeling, indentation, rust, crack and wear will be reflected in the bearing vibration test so through the use of special bearing vibration measurement device ( Frequency analyzer and vibration meter, etc. ) Can measure the size of the vibrations through the frequency distribution can be deduced under the condition of abnormal vibration measured values due to the use of spherical roller bearing conditions or sensor installation position and therefore need different measurements of each machine in advance decision criteria determined after analysis and comparison.