Four specific treatment methods for excessive temperature of fag stainless steel bearing
Four specific treatment methods for excessive temperature of fag stainless steel bearing
2022年3月30日
The assembly quality of fag rolling mill bearing determines the cause of damage
The assembly quality of fag rolling mill bearing determines the cause of damage
2022年3月30日

Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method

Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method

  • 1、 Cause analysis of noise of rotary table bearing raceway
  • a. Noise and vibration are random;Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • b. The vibration frequency is above 1kHz;
  • c. No matter how the rotating speed changes, the main frequency of noise is almost unchanged, while the sound pressure level increases with the increase of rotating speed;Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • d. When the radial clearance increases, the sound pressure level increases sharply;
  • e. When the rigidity of the bearing pedestal increases, the lower the total sound pressure level is, and even if the speed increases, the total sound pressure level does not increase much;Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • f. The higher the viscosity of lubricant, the lower the sound pressure level, but for grease lubrication, its viscosity and the shape and size of soap fiber can affect the noise value.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • The sound generation source of raceway is caused by the natural vibration of ferrule after being loaded. The elastic contact between the ferrule and the rolling body constitutes a nonlinear vibration system. 
  • When the lubrication or machining accuracy is not high, the natural vibration related to this elastic feature will be excited, and when it is transmitted to the air, it will become noise. Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • As we all know, even if the contemporary superb manufacturing technology is adopted to process the rotary table bearing parts, there will always be small geometric errors in varying degrees on the working surface, resulting in small fluctuations between the raceway and the rolling body and exciting the natural vibration of the vibration system.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • Although the raceway noise of fag bearing is inevitable, high-precision machining of the working surface of parts, correct selection of rotary table bearing and accurate use of bearing can be adopted to reduce noise and vibration.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • 2、 Rust prevention maintenance method
  • 1. Immersion method: the rotary table bearing is immersed in antirust grease and a layer of antirust grease is adhered to its surface. The thickness of oil film can be achieved by controlling the temperature or viscosity of antirust grease.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • 2. Brush coating method: it is used for rotary table bearings or bearings with special shapes that are not suitable for soaking or spraying. During brush coating, attention should be paid not only to avoid accumulation of antirust oil, but also to prevent missing coating.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • 3. Spray method: some large FAG bearings can not be oiled with immersion method. Generally, the filtered compressed air of about 0.7Mpa pressure is used for spraying in the clean air area. Spray method is suitable for solvent dilution antirust oil or thin layer antirust oil, but must adopt perfect fire protection and labor protection measures.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • The judgment criteria vary according to mechanical properties, importance and inspection cycle. In case of the following damage, the one-way thrust ball bearing shall not be reused and must be replaced. Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • In the process of using bearings, grease is very critical. If deteriorated grease is used, it will not only fail to play its due role, but also damage the bearing.Generation and Elimination of Noise of One-Way Thrust Ball Bearing

Generation and Elimination of Noise of One-Way Thrust Ball Bearing

  • Twist the lubricating oil between the thumb and index finger and grind it repeatedly. The better lubricating oil hand feels lubricity, less wear debris and no friction. If it feels a large friction feeling such as sand particles between the fingers, it indicates that there are many impurities in the lubricating oil and it can not be used again. It should be replaced with a new lubricating oil.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • Raceway sound of one-way thrust ball bearing and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the one-way bearing is running. It is a unique basic sound that will occur in all rolling bearings. Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • The metallurgical quality of unidirectional thrust ball bearing material was once the main factor affecting the early failure of bearing. With the improvement of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • The proportion of raw material quality factor in bearing failure analysis has decreased significantly, but it is still one of the main influencing factors of bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.Generation and Elimination of Noise of One-Way Thrust Ball Bearing
  • The main task of failure analysis of one-way thrust ball bearing is to find out the main factors causing bearing failure according to a large number of background materials, analysis data and failure forms, so as to put forward targeted improvement measures, prolong the service life of self-aligning roller bearing and avoid sudden early failure of bearing.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  • The vibration of one-way thrust ball bearing has a significant effect on the failure of bearing. For example: peeling, indentation, corrosion, crack Wear, etc.Cause analysis of noise in bearing raceway of fag rotary table and anti rust maintenance method
  •  will be reflected in the bearing vibration detection, so the vibration can be measured by using special bearing vibration measurement devices (frequency analyzer and vibration instrument, etc.), and the details of abnormal vibration can be inferred from the frequency distribution. 
  • The measured values are different due to the use premise 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 and determine the judgment scale.
  • 1. Cause: the inner shell of the bearing runs. Method: replace the bearing and related worn parts
  • 2. Cause: poor lubrication method: select the specified brand of lubricating materials and clean them properly
  • 3. Cause: the belt is too tight. Method: adjust the belt to make it elastic properly
  • 4. Cause: the main shaft is bent or the box hole is not concentric. Method: repair the main shaft or box
  • 5. Cause: low assembly quality method: improve assembly quality
  • 6. Cause: low bearing accuracy method: select the bearing with specified accuracy grade
  • 7. Method of excessive axial force: clean and adjust the clearance of sealing ring between 0.2 ~ 0.3mm, correct the diameter of impeller balance hole and verify the static balance value
  • 8. Bearing damage method: replace the bearing
Technical requirements for Timken non-standard bearing