Bearing fault identification and main form
Three identification method for bearing fault
Bearing as the precision parts of mechanical equipment factory, how to want to increase productivity, the first mechanical equipment performance must be the best, and the use of machinery and equipment performance relationship -- one of the largest bearing. So the factory in production process, must be good inspection of the bearings in mechanical equipment. For safety reasons, share three large bearing fault recognition method, we hope to help.
1, by voice recognition
Recognition needs to have a rich experience through sound. Must be adequately trained to be able to identify the bearing and non bearing sound sound. Therefore, should as far as possible by the person for the job. Listening stick attached to the shell bearing voice heard clearly by listening device or.
Identify 2, through the working temperature
The method is comparison method of identification, used only in running condition, less change of situation. Therefore, the need for continuous recording of the temperature. When a fault occurs, the temperature will not only increase, there will be no rule changes. The method and voice recognition method and appropriate.
Identify 3, through the lubricant state
Analysis on lubricant sampling, through the level of dirty, is mixed with foreign body or metal powder of judgment. The method cannot be close to the observed bearing or large bearings are particularly effective.
The main form of rolling bearing fault
1 fatigue spalling
The inside and outside of the rolling bearing raceway and rolling body surface can bear load and the relative rolling, because of alternating load, first under the surface at a certain depth (the maximum shear stress at crack formation), and then extend to the contacting surface to surface flaking in the pit, the last to the development of large particles, this phenomenon is fatigue flake. Spalling fatigue will cause the operation of the impact load, vibration and noise intensified.
2 wear
Since the invasion of dust, foreign body, raceway and rolling body relative motion will cause surface wear, lubrication bad it can aggravate the wear, the wear results the bearing clearance increases, the surface roughness increases, reduce the bearing running accuracy, and thus reduce the movement precision of the machine, vibration and noise will increase. For precision machinery bearings, often wear quantity limit bearing life.
3 plastic deformation
When subjected to large impact loads or static load, or because of the thermal deformation caused by the additional load, or a foreign body of high hardness intrusion will be formed on the surface of the raceway dents or scratches. This will make the vibration and noise of rolling bearings violent generated in the process of operation. But once the indentation, indentation caused by impact load will be further induced near surface spalling.
4 corrosion
Corrosion is one of the most serious problems of rolling bearings, high precision bearings may be due to the surface corrosion cause precision loss and cannot continue to work. Water or acid and alkaline substances direct penetration will cause bearing corrosion. When the bearing stop work, bearing temperature decline to the dew point, moisture in the air condenses into water droplets attached to the bearing surface can also cause corrosion. In addition, when the bearings inside the current through the, current may through the raceway and rolling contact points on the body, very thin oil film by electric spark generated electric corrosion, formed on the surface of the washboard in rugged.
5 fracture
High load bearing parts may cause fracture. Grinding, heat treatment and assembly incorrectly can all cause residual stress, work excessive thermal stress will cause bearing parts breakage. In addition, the assembly method, assembly process properly, can also cause bearing ring rib and roller chamfering off block.
6 glue
Work in the bad, high speed and heavy load lubrication condition, due to frictional heating, bearing parts can achieve very high temperature in a short time, resulting in surface burns and bonding. The so-called bonding refers to a component on the surface of the metal adhesion to the phenomenon of another parts on the surface.
7 cage damage
Because the assembly or improper use may cause the holder is deformed, it increased with the friction between the rolling body, and even make some rolling body death card can not roll, may also cause the holder and the inner and outer ring friction etc.. This damage will further enable the vibration, noise and heated, causing bearing damage.
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