Judging the fault damage adjustment pre-tightening method of ntn angular contact ball bearing

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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The importance of using deep groove ball bearing grease for stability

1, anti-rust performance

The rust preventive agent is preferably insoluble in water, has good adhesion, and can form an oil film on the surface of the steel.

2, mechanical stability

If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3, oil seal

Oil seals are necessary to protect deep groove ball bearings and lubricants from external contamination. During the operation of TIMKEN bearings, no matter whether debris or moisture can penetrate into TIMKEN bearings to prevent damage.

4, mixed grease

Do not mix incompatible greases. If two incompatible greases are mixed, the consistency will usually become soft. Finally, the TIMKEN bearing may be damaged due to the easy loss of grease.

5, the classification of oil

The consistency and lubricity of grease are affected by the operating temperature. TIMKEN bearings operating at a certain temperature must select greases with the correct consistency and good lubrication at the same temperature.

In general, the amount of grease filled in deep groove ball bearings always exceeds the actual required amount of direct participation in lubrication, in the cavity on the frame and in the bearing cover, and forms a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of the excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be carried by the rolling element into the raceway. In the early stages of the bearing, most of the grease is squeezed out of the raceway very quickly (less than a minute), and the build-up grease is discharged a small amount while circulating along with the bearing rotor. At this time, the bearing temperature continues to rise until the excess bearing grease is completely discharged, which can be called the running phase of the grease. According to the grease quality and filling amount in the TIMKEN bearing structure, this time may last for more than ten. Minutes, even hours.

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