From the peeling, indentation, rust, crack, wear and so on, it will be reflected in the vibration measurement of the bearing. The ntn bearing vibration is very sensitive to the damage of the bearing. Therefore, the angular contact ball bearing adopts a special bearing vibration measuring device ( The frequency analyzer can measure the magnitude of the vibration, and the specific situation of the abnormality cannot be inferred by the frequency division. Since the measured values differ depending on the conditions of use of the bearing or the mounting position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Because the ntn bearing emits abnormal sounds and irregular sounds even if it is slightly peeled off, it can be distinguished by the sounder. The sounder is used to measure the size and sound quality of the angular contact ball bearings in operation. Check it to prevent it in advance.
If the oil hole can directly measure the bearing outer ring temperature, it is more suitable. In general, the temperature of the ntn bearing is generally estimated based on the temperature outside the bearing. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Usually, the temperature of the bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of an angular contact ball bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If necessary, use the thermal sensor to monitor the working temperature of the bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the burning shaft accident.
The assembly of the ntn bearing is the basic operation in the assembly and repair work of the fitter, and the adjustment and preloading of the clearance is an important part of the assembly work of the rolling bearing. Accurately grasping the process concept of clearance adjustment and pre-tightening, and correctly applying this process in assembly work is the guarantee of the quality of bearing assembly work.
The clearance of the ntn bearing refers to the maximum amount of movement of the other ferrule in the radial or axial direction when one ferrule is fixed, so the clearance is divided into radial clearance and axial clearance. When angular contact ball bearings are assembled, the clearance should not be too large or too small. If the clearance is too large, the number of rolling bodies that can bear the load at the same time is reduced, and the load of the single rolling element is increased, thereby reducing the rotation precision of the bearing and reducing the service life; if the clearance is too small, the frictional force is increased, and the generated heat is generated. Increased, increased wear and tear, can also reduce the service life of the bearing. Therefore, the bearings must be tightly controlled and adjusted during assembly.
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