The peeling damage of the NSK bearing means that when the bearing rotates under load, the raceway surface or rolling body surface of the inner and outer rings exhibits scaly peeling due to rolling fatigue.
The causes of bearing peeling damage are: excessive load on the bearing; poor lubrication of the bearing or selection of inappropriate lubricants; poor installation, torque load, foreign body intrusion or water ingress; poor precision of the bearing box is too low, and the rigidity of the bearing box is uneven The deflection is large; rust, erosion points, scratches and indentation, etc.
Precautions: Check the size of NSK bearing load and the bearing used in the research again; select the appropriate lubricant to lubricate the bearing and improve the lubrication method; improve the installation method, strictly follow the installation procedure for installation, improve the sealing device, and shut down Anti-rust measures; check the accuracy of the shaft and bearing box, select bearings with high accuracy grade; check the bearing clearance to make it appropriate.
The vibration of the NSK bearing has a significant effect on the failure of the bearing. For example: peeling, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration detection. So by using special bearing vibration measurement devices (frequency analyzer and vibrometer, etc. ) The size of the vibration can be measured. The frequency distribution can be used to infer the details of the abnormal vibration. The measured values are different due to the use premise of the bearing or the installation position of the sensor, etc. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine and judge scale.
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At present, the equipment that uses precision bearings is becoming more and more refined, and the grease used in NSK bearings must have the following functions:
(1) With the same operating life as the bearing, the maintenance cycle should be delayed as much as possible, the downtime should be shortened, and the labor productivity can be improved.
(2) At a high speed of dn>5×105, it is necessary to ensure that the temperature rise of the motor is low and oil is not dumped, thereby reducing power consumption and protecting the motor.
(3) Its scalar content control is under the inevitable standard, and the pollution of the equipment noise to the situation is minimized.
(4) Under the premise of ultra-low temperature work, it guarantees the flexibility of starting and running of bearings, common problems of NSK bearings. Guaranteed minimum output power.
The cleaning of the removed NSK bearings is divided into rough cleaning and fine cleaning, and they are placed in the container, and the metal mesh pad is placed first so that the bearing does not directly contact the dirt of the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, and it should be noted. In the coarse cleaning oil, use a brush to remove smooth grease and adhesions. After roughly cleaning, transfer to fine washing.