Judging the fault maintenance method of SKF self-aligning ball bearing in use

SKF bearings exhibit a strong regularity during their use and are very repeatable. Normal high-quality bearings (SKF bearings) have relatively small vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the state of the self-aligning ball bearings is very stable and enters a stable working period.
After continuing to run, the vibration and noise of SKF bearings begin to increase, and sometimes abnormal sounds appear, but the change of vibration increases slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that SKF bearings are initially faulty at this time.
At this time, it is required to closely monitor the SKF bearing and pay close attention to its changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both exceed the vibration standard, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the self-aligning ball bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the SKF bearing.
SKF bearings exhibit late failure characteristics to serious failures (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of self-aligning ball bearings, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.
The use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. According to the technical requirements of SKF bearing installation, use, maintenance and maintenance, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the SKF bearing in operation, find the cause and immediately adjust the cause. Make it back to normal.

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Standard method and lubrication maintenance for installing NSK rolling bearings

Since the rolling bearings are rust-proofed and packaged, do not open the package until installation.
In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose NSK bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.
Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.
Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.
The method of installing the rolling bearing depends on the fit, condition and structure of the NSK bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.
When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
Mounting bearing: Whether the rolling bearing is installed accurately, affecting accuracy, life and function. Therefore, the bearing installation plan and the disassembly part are enriched. I hope I can install it according to my homework. The names of the homework scales are as follows:
(1) Clearing and bearing related components;
(2) Check the size and packing components related to the case;
(3) installation;
(4) Checking after bearing installation;
(5) A smoothing agent supplied.
Just close the packaging bearing before installation. Generally smooth grease is smooth, not clean, and directly adds smooth grease. Smooth oil, generally not clean, but use instruments or high-speed bearings and clean with clean oil to remove the rust inhibitor applied to NSK bearings. Remove the bearing, rust and rust inhibitor, we can't open it. In addition, it has been sealed up, the VTC grease bearing, not washed directly. The mounting method of the bearing differs depending on the bearing layout and the premise. Generally, more shafts are twisted, and the inner ring nuisance is suitable for the request.
The installation of the rolling bearing should be based on the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the ferrule that is tightly fitted. The pressure should not be transmitted through the rolling element. The following methods are generally used for bearing installation:
Thrust bearing installation
The full complement of the thrust bearing and the shaft is generally a transition fit. The fit between the race and the bearing bore is generally a clearance fit. Therefore, the bearing is easier to install. The middle shaft of the two-way thrust bearing should be fixed on the shaft to prevent relative The shaft rotates. The installation method of NSK bearing is generally the case of shaft rotation. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.

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