How to effectively guarantee the longest service life of nsk bearings

  In order to ensure the long life of nsk bearings, it is not enough to meet the general installation and adjustment requirements. It is recommended to take the following measures:
    (1) The nsk bearings are grouped according to the size of their interference fit surface, and the bearings are sequentially arranged in each group according to their clearance size. The corresponding shaft or seat hole diameters are grouped in the same way. A bearing set having a large interference fit surface size is matched with a shaft group or a seat hole group having a large diameter, and a corresponding group having a small size and a small diameter is selected. In each corresponding group of matching, the nsk bearing with large clearance is tightly matched, and the nsk bearing with small clearance takes a loose fit. The result of this selection makes the nsk bearing's interference interference more consistent in the same batch of machines, which is neither too loose nor too tight, and the clearance is relatively uniform, thus ensuring the prestress of the nsk bearing after installation is appropriate. And to avoid creeping, ferrule bursting, impact due to improper play, vibration or heat, cohesion and other abnormal bearing failure.
    (2) The coaxiality of the journal and the seat hole at both ends of the support and the perpendicularity to the support end face are strictly ensured to prevent the occurrence of additional load. If possible, the mechanical components acting on the load outside the bearing should be slightly away from the nsk bearing at the end that is more susceptible to damage, and the shaft and rotating part system should be as smooth as possible.

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Briefly describe the vibration and temperature check of skf bearings

1, the vibration of the bearing
SKF bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, corrosion, cracks, wear, etc. are reflected in the vibration measurement of deep groove ball bearings. Therefore, special bearing vibration measuring devices (frequency analyzers, etc.) are used. The magnitude of the vibration can be measured, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured values ​​vary depending on the conditions of use of the bearing or the mounting 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.
2, the temperature of the bearing
The temperature of the SKF bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the temperature of the bearing outer ring, it is more suitable.
Usually, the temperature of the deep groove ball bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply, and the SKF bearing will have abnormally high temperature. At this time, it is necessary to stop the operation and take necessary precautions.
The thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm or stop the occurrence of the burning shaft accident when the temperature exceeds the specified value.
The use of high temperatures often indicates that the bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes deep groove ball bearings are overheated and can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.
Therefore, it is necessary to continuously monitor the temperature of the deep groove ball bearing, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.
The periodic measurement of the bearing temperature can be performed by means of a thermometer, such as a digital thermometer, which accurately measures the bearing temperature and displays it in °C or Fahrenheit.
 The importance of the bearing means that when it is damaged, it will cause the equipment to stop. Therefore, it is better to install a temperature detector for such deep groove ball bearings.
 Under normal conditions, the skf bearing will naturally rise in temperature after lubrication or relubrication for one or two days.

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