Judging the service life of fag needle roller bearing from its running sound
Judging the service life of fag needle roller bearing from its running sound
2022年5月31日
Precautions for determining whether ina bearing is overhauled
Precautions for determining whether ina bearing is overhauled
2022年6月2日

Troubleshooting method for temperature and vibration of four row cylindrical roller bearings

Bearing vibration: cylindrical roller bearings

 
  • Bearing vibration is very sensitive to bearing damage, such as spalling, indentation, corrosion, crack, wear, etc., which will be reflected in the vibration measurement of four row cylindrical roller bearings. Therefore, the vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific abnormal conditions can not be inferred from the frequency analysis. 
  • The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Bearing temperature:Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The bearing temperature can generally be inferred from the temperature outside the bearing chamber. It is more appropriate if the bearing outer ring temperature can be directly measured by using the oil hole.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Generally, the temperature of four row cylindrical roller bearings begins to rise slowly with the operation of the bearings, and reaches a stable state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The thermal sensor can monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accidents.
  • The fault characteristics of four row cylindrical roller bearings show that when the serious fault is no more than one week old, the equipment has larger capacity, faster speed and shorter time interval. Therefore, the actual bearing fault diagnosis, once the fault is found, its advanced function should decisively determine the fault of the self-aligning roller bearing and repair it as soon as possible.
  • Selection and control of shaft and bearing housing tolerances: the bearing shall rotate flexibly without blocking after being pressed into the bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large, and the tolerance should be adjusted.
  • Assembly method of bearing: because the bearing is a high-precision product, if it is improperly assembled, it is easy to damage the groove of four row cylindrical roller bearing, resulting in bearing damage.
  • Prevention of assembly foreign matters: when the four row cylindrical roller bearing is installed on the rotor for dynamic balancing, it is easy to put the iron filings generated during dynamic balancing into the bearing, so it is necessary to perform dynamic balancing before installing the bearing.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Prevention of paint rust: paint rust is often found in sealed motors. The sound of the motor is very good during assembly, but after it has been stored in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the bearing is removed.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • If there are too many problems in the inspection of four row cylindrical roller bearings, it also indicates that this kind of bearing may be a fake imported bearing. That is to remind everyone to be careful when choosing.
  • Although NSK Bearings are metal, they will also be damaged. No matter what hard material they are, they will be damaged to different degrees. As we all know, double row deep groove ball bearings are of good quality and made of good steel. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Steel is a very solid material, but they will also be damaged. The bearings run in the machinery every day, and it is easy to damage the bearings due to constant friction. Therefore, we should also prevent bearing damage, Properly maintain the bearings. Do not use NSK Bearings indiscriminately, causing unnecessary losses to yourself.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
Troubleshooting method for temperature and vibration of four row cylindrical roller bearings

Although cylindrical roller bearings are metal, they will also be damaged.

  • NSK Bearings are necessary to ensure that excessive deformation occurs during installation. There are many things to be done for double row deep groove ball bearings. The following describes the effects of those aspects that need attention.  No matter what hard material they are, they will be damaged to different degrees. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • As we all know, double row deep groove ball bearings are of good quality and made of good steel. Steel is a very solid material, but they will also be damaged. The bearings run in the machinery every day, and it is easy to damage the bearings due to constant friction. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Therefore, we should also prevent bearing damage, Properly maintain the bearings. Do not use NSK Bearings indiscriminately, causing unnecessary losses to yourself.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • NSK Bearings are necessary to ensure that excessive deformation occurs during installation. There are many things to be done for double row deep groove ball bearings. The following describes the effects of those aspects that need attention. 
  • According to the formation mechanism of grinding metamorphic layer on the working surface of fag bearing, the main factors affecting the grinding metamorphic layer are grinding heat and grinding force. The following is an analysis of the reasons for the failure of cylindrical roller bearings.
  • Main purpose of preloading: the main purpose and representative examples of preloading can be demonstrated by giving some examples:
  • It can correctly determine the radial direction and axial direction of the shaft and restrain the runout of the shaft.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Improve the rigidity of fag bearing. The main shaft bearing of the machine tool and the pinion bearing of the bicycle differential mechanism.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Prevent axial vibration and abnormal sound caused by resonance. Bearings for small motors.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • For cylindrical roller bearings under combined load, as the number of loaded rolling elements increases, the friction resistance increases, the fever increases, the lubrication and cooling conditions become worse, and the force acting on the cage also increases, it is necessary to adjust the limit speed of the bearing by multiplying a reduction factor F2 according to the type of fag bearing and the size of load angle.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • If the limit speed of the selected cylindrical roller bearing can not meet the application requirements, some improvement techniques and methods can be adopted to make progress to meet the requirements. Such as improving the tolerance difference of bearings; Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Properly increase the clearance; Use special materials and improve the structure of the holder; Change the lubrication method, such as oil-gas, oil mist and spray lubrication; Improve cooling conditions, etc.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The temperature rise is easy to occur in the process of using fag bearings. When the temperature of cylindrical roller bearing rises, first judge whether it is misoperated. If it does rise, do the following
  • handle:Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Check whether the cooling water pressure, water flow and pipeline system are normal. If the filter is blocked due to low water pressure and cannot be handled in time, it can be shut down for treatment. When it is confirmed that it can work, it can be put into use.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Check whether there is abnormal sound in fag bearing and whether the swing of cylindrical roller bearing is abnormal.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Take an oil sample to observe whether the oil color has changed, and conduct laboratory test to see whether it has deteriorated. If the deterioration is confirmed, stop the machine and replace the oil.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Check whether the oil level of the oil indicator is normal. If not, check whether the oil drain valve of the oil tank is tightly closed. If it has been closed tightly, it shall be filled with oil. If it is leakage of sealant gasket, it shall be shut down for treatment

Search and inspection results cylindrical roller bearings

  • When the inspection of Timken cross roller bearing equipment is suspended during regular maintenance, operation and replacement of peripheral parts, it is required to judge whether Timken cross roller bearing parts can be used again and record the good or bad application conditions.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Secondly, check whether the raceway surface, rolling surface and joint surface of the bearing and the wear condition of the standoff frame are damaged or abnormal. In particular, check the running track of the raceway surface.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  •  To judge whether Timken cross roller bearing can be used again, we should make a decision after considering the level of bearing damage, mechanical function, priority, operation premise, search and inspection cycle, etc.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Search and inspection results. If Timken cross roller bearing is found damaged or abnormal, please find out the notice according to the phenomenon of bearing damage and formulate countermeasures. In addition, the search and inspection results, if there are several defects below, the bearing can no longer be used, and it needs to be replaced with a new bearing.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • If the flow bearing is used in harsh environment, the bearing seal ring and seal cover are essential, because they can prevent dirt from invading and prolong the service life of the bearing. Rolls in rolling mills are usually supported by Timken cross roller sub bearings. It is required to bear strong impact load and invasion of water and debris during use.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The negative pressure generated in the bearing can cause water to invade from the main seal, and the structure of the hole seal has a great impact on the negative pressure. Therefore, reducing the negative pressure in Timken cross roller bearing is the basic requirement to prevent water from entering. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The effective method is to make the hole seal not directly contact with water, while retaining the original function of the hole seal – to prevent water and dirt from invading from the side of the roll neck. The sealing method adopts surface contact instead of line contact. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The surface contact hole sealing has the characteristics of good sealing performance in both the running process and the static process. Therefore, the new super capacity sealed clean bearing has higher reliability than the traditional sealed bearing.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Under severe lubrication conditions, the load of the bearing is increased by 34%, and the bearing has high reliability, long service life and easy maintenance. This performance improvement is the result of optimizing mechanical design, adopting new materials and patented sealing technology. Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Compared with the traditional Timken cross roller bearing, this Timken cross roller bearing not only increases the basic rated dynamic load by 34%, but also prolongs the service life by 2.7 times.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • According to the causes of damage of SKF radial ball bearing, careful analysis can be made to prevent it.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The bearing shall be properly kept. The bearing shall not be exposed to rain or moisture to avoid corrosion. It is strictly prohibited to knock and bruise.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • The type, configuration and accuracy of SKF radial ball bearings shall be reasonably selected according to the size, direction and nature of the load.
  • According to the use of SKF radial ball bearings in machinery and equipment, the matching properties and tolerance grades of bearings and bearing seats, bearings and shafts are reasonably selected.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Avoid electric current passing through the bearing to prevent electric corrosion.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • For the important SKF centripetal ball bearings, there should be a good environment in use to prevent the vibration corrosion of the bearings caused by the strong vibration of the nearby punch.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Demagnetize the bearing with residual magnetism to prevent the adsorption of metal debris.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Avoid the heating caused by friction caused by the relative sliding between the inner and outer rings of the bearing and other contact parts.
  • The inspection items during operation include the rolling sound, vibration, temperature, lubrication status, etc. of SKF centripetal ball bearing. The details are as follows:Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  • Rolling sound of bearing
  • The sound detector is used to check the rolling sound and sound quality of the running SKF centripetal ball bearing. Even if the bearing has slight peeling and other damage, it will produce abnormal sound and irregular sound, which can be distinguished by the sound detector.
  • Bearing vibration
  • Bearing vibration is very sensitive to bearing damage, such as spalling, indentation, corrosion, crack, wear, etc., which will be reflected in the vibration measurement of SKF centripetal ball bearing. Therefore, the vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific abnormal conditions can not be inferred from the frequency analysis.Troubleshooting method for temperature and vibration of four row cylindrical roller bearings
  •  The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
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