Cause Analysis of Damage and Failure of Cylindrical Roller Bearings

Before the cylindrical roller bearing is completely destroyed, it provides enough time for the user to find out. Don't ignore the existence of this friction, which will reduce the speed of riding and make the long-distance physical consumption more and slower. If the roughness of the surface is small, if the lubricating oil film has an appropriate thickness, the probability of surface stress generation is quite low, which is why it is necessary to select a suitable oil for lubrication. However, if the pressure load exceeds If the pu value of the oil film (fatigue load limit value, such as too high rotation speed, too high pressure impact), the fatigue of the material will come sooner or later. The metallurgical quality of cylindrical roller bearing materials has been the main factor affecting the early failure of timken bearings. With the improvement of metallurgical skills (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting bearing failure. Whether the selection of materials is appropriate is still a factor that must be considered in the analysis of bearing failure. The main task of the failure analysis of cylindrical roller bearings is to find out the main factors that cause bearing failure based on a lot of background data, analysis data and failure methods, so as to propose improvement measures in a targeted manner and extend the service period of the bearing. , to prevent the sudden early failure of the bearing. (1) There are many factors that affect the fatigue life of cylindrical roller bearings, which cannot be fully estimated or eliminated through standard experimental conditions, which results in a great dispersion of the actual bearing life of the bearing, so the expression parameter of the bearing fatigue life is The extra life is l10. The meaning of l10 in the iso recommendation specification r281 is clear and the rules are as follows:“A sufficient number of the same batch of bearings, the extra life of l10 is expressed in the number of revolutions (or in hours when the speed is constant, 90% of the bearings in this batch can reach or exceed this revolution before the exhaustion occurs. number (or hours)”. So far, the nations of the world have obeyed the above rules. In some countries such as the United States, the concept of median life expectancy is also used. The median life lm refers to the median life of a batch of the same cylindrical roller bearings, that is, 50% of the bearings can reach or exceed the total number of revolutions before they are exhausted and peeled off, or the number of working hours at a certain speed, the median value The life lm is not an arithmetic mean of the life of a batch of bearings. The average median life lm is about 5 times the extra life. (2) The concept of extra life is only applicable to a sufficient number of bearings, not a single bearing. For example, if there are 40 sets of 6204 bearings according to their operating conditions, their extra life is 1000h without causing fatigue damage, and the other 4 sets can be exhausted bearings in less than 1000h, the meaning of the extra fatigue life represents this batch of cylinders. The expected life of a roller bearing when it normally develops its material potential. Therefore, in most cases, users still need to calculate the fatigue life when selecting cylindrical roller bearings, and then check according to the actual failure category, such as the wear life check, and take the smaller value of the calculation results as the bearing calculation life. . Causes of premature failure of cylindrical roller bearings (improper lubrication) despite being mountable“Maintenance free”Although 36% of bearings that fail prematurely are still due to incorrect application of grease technology. Any improperly lubricated cylindrical roller bearing will inevitably fail prematurely. Because the timken bearing is a part of the hub that is not easy to assemble and disassemble, the incorrect grease is used congenitally, and the grease is not replaced in the later use, or If the grease is not replaced in time after carbonization, deterioration and contamination, it will be difficult for your hub to have a long enough life and good lubrication.

One increasingly popular managerial tactic to improve problem-solving performance of CONTACT US is to increase the connectedness, or what academics call clustering, of the organization

We believe our capacity can give you an impressive experience by using CONTACT US.

HangZhou Jnsn Bearing Imp& Exp Co., Ltd who primarily serve our consumers need to consider offering their products in an Bearing Suppliers such as CONTACT US to take advantage of the growing interest from consumers in supporting Hrb Bearing China.

Many homeowners find that they can cut costs while keeping home cool efficiently with .