CNC Knowledge: If the bearing is abnormally strong, try to replace a clean lubricant!

Normal working sound

1. If the bearing is in a good continuous state of rotation, it will make a sound of low or buzzing groaning. If a pointed whistle, grinks and other irregular sounds are developed, this often indicates that the bearing is in poor rotation. Net grinking noise can be caused by inappropriate lubrication. An inappropriate turnover can also cause a metal sound.

2. The bumps on the external rolling ring track will cause vibrations and cause smooth and clear sound.

3. If there is intermittent noise, it means that the rolling member can be damaged. This sound occurs when the damaged surface is deployed and the contaminants in the bearing often cause a whistle. Serious damage can produce irregular and enormous noise.

4. If the scars of blows caused during the installation will also produce noise, which will vary depending on the running speed.

Abnormal rolling

Great metal noise

Reason 1: Exceptional load
Breakdown: correct and cooperate, study the roll of bearing, adjust and load, and correct the position of the shell shoulder.

Reason 2: Now installation
Break up: precision of machining trees and shells, improve the accuracy of the installation and the installation method.

Reason 3: Insufficient or unsuitable lubricant
Breeks: reconstruction of lubricants and select the appropriate lubricants.

Reason 4: There is a contact between rotating documents
Conversely: modify the contact part of the curved road seal.

Regular noise

Reason 1: Indentation, rust or scratches caused by foreign objects
Countermeasures: replace the bearings, clean the relevant parts, improve sealing devices and use clean lubricants.

Reason 2: (after the steel carburetor) Surface deformation
Connection: replace the bearing and pay attention to its use.

Reason 3: surface péling of the racing lane
Connection: replace the bearing.

Irregular noise

Reason 1: The gap is too large
Breeks: Study the coordination and clearance of bearing and modify the preload.

Reason 2: Foreign objects invade
Breakdown: Research on replacing bearings, cleaning of relevant parts, improving sealing devices and their use.

Reason 3: Spherical injury, coat
Connection: replace the bearing.

Methods and instruments to detect abnormal bearing sounds

Currently, there are two ways to detect abnormal rolling sounds. One is the acoustics -based noise detection method, and the other is a detection method based on vibrations.

(I) Noise detection method

In a sound silence environment with a base noise less than 20 dB, a high quality microphone is used to extract the sound pressure signal at a certain distance and a certain direction, and extract abnormal sound components through certain methods of ‘analysis. Direct measurement method for abnormal sound.

(Ii) Vibration detection method

This is an indirect detection method for abnormal sounds and can be divided into qualitative detection method and detection method of quantitative parameters. Among them, the qualitative detection method is divided into surveillance of the abnormal sound method and by observing the method of the vibration wave form. The quantitative parameter detection method refers to the use of the values ​​of measured parameters linked to an abnormal sound in the vibration signal of the bearing to be tested, such as the crest value of vibrations and the crest factor to assess the abnormal sound Running.

(Iii) Measure the instruments to measure the abnormal sounds of the bearings

There are many measuring instruments to measure abnormal abnormal sounds, such as: Bant-1 type of abnormal sound monitor of Hangzhou test and research test; Institute and Dalian bearing S0910-III developed jointly by the instrument plant. These rolling measurement instruments can measure the effective value of rolling vibrations and measure the crest value, the cutting -edge factor and the number of impulses that reflect the abnormal sound parameters of the bearings.

Correct storage method for bearings

1. Keep the original packaging and do not open it at will.

2. The relative humidity of the storage room cannot exceed 60% and the temperature difference cannot be too large. Sealed bearings or bearings with dust lids, after long -term storage, the grease lubrication properties filled with the bearing can be reduced.

3. The storage room must also be protected from vibrations and tremors. Rounds not stored in the original packaging must be properly stored.

4. Large roller bearings can only be placed flat when stored, and it is preferable to be taken care of on the sides of the interior and exterior rings. If it is stored vertical, permanent deformation can occur due to heavy interior and exterior rings and ride parts, while the walls of the internal and relatively thin ring.