Bearing Maintenance

Rust, corrosion
Injury Status: rust and corrosion of spherical ball bearings have raceways round of pit-like rolling surface rust, rust and corrosion round.
The reason: water, corrosive substances (paint, gas, etc.) intrusion. Lubricants inappropriate. Due to condensation of water vapor with water droplets. Temperature and humidity when stopped. During transport heavy rustproof bad. Inappropriate custody status. Inappropriate use.
Measures: to improve the sealing device. Research lubrication. Turn when stopping corrosion protection. Improve storage methods. To be used with caution.
Installation scars
Damage state: When you use during installation and removal, etc. to the roll axis linear scars road surface and rolling surface caused.
Cause: The installation, disassembly of the inner and outer rings tilt installation, impact load of destruction.
Measures: the impact load to prevent the use of appropriate tools to use punch. Centering each other during installation.
Discolor
Damage state: As temperatures rise and lubricants reactions, raceways and rolling elements and the wheel cage discoloration.
The reason: poor lubrication. Causing hot oiled and reflect lubricant. Large temperature rise.
Measures: improving lubrication.
From the foregoing, regardless of the gap can be adjusted or non-adjustable gap bearings, they have to adjust the axial clearance in the assembly (the gap is not adjustable but some do not have to stay thrust roller bearing xial clearance), when the temperature rises to compensate for shaft the thermal elongation, thus ensuring the normal operation of thrust ball bearing body. If the axial clearance is too small, it will cause the bearing to rotate difficulties, fever, and even bearing body stuck or damaged; if the axial clearance is too large, it will result in different sound operation, vibration or even cause serious damage to the retainer .

Self-aligning ball bearings judgment in the use of the method of fault maintenance

bearings exhibit during its use in the strong regularity and repeatability is very good. Normal quality Full complement cylindrical roller bearing (Bearings) at the start of use, vibration and noise are relatively small, but some scattered spectrum amplitude are small, may be due to some defect in the manufacturing process, such as the surface of burrs caused.
Some time after exercise, maintain a certain level of vibration and noise, the spectrum is a single, there is only one or two multiplier. Rarely occurs more than three times the power frequency spectrum, self-aligning ball bearing condition is very stable to stable period.
After continuing to run into the post-use, bearing vibration and noise begins to increase, sometimes different sound, but changes in vibration increases more slowly this time, suddenly began bearing kurtosis value reaches a certain value. We believe that at this time that the performance of the initial bearing failure.
At this time, it requires close monitoring of the  bearings, pay close attention to the changes. Since then, single direction thrust ball bearing kurtosis began a rapid decline, and close to normal, and the vibration and noise began to significantly increase its growth began to accelerate dramatically, when the vibration exceeds the vibration standards (such as ISO2372 standard), which began bearing kurtosis Rapid increases, when both exceed vibration standards, and kurtosis values ​​than normal (available kurtosis relative standard), we believe that self-aligning ball bearing has entered the late failure of production, the need for timely maintenance equipment, replacement of bearings.
bearings exhibit features advanced fault to a serious failure (usually as axle bearing damage, burns, sand shelf spallation, raceway, wear beads, etc.) is not more than a week the big time, the greater the equipment capacity, the faster the speed, The shorter time intervals. Therefore, the actual self-aligning ball bearing fault diagnosis, once found fault with advanced features, faulty judgment should be decisive rolling mill bearing arrangements for maintenance as soon as possible.
Use the adjustment factor mainly refers to the installation, use and maintenance, repair and other maintenance meets the technical requirements. According to bearing installation, use, maintenance, maintenance of the technical requirements for the operation of bearings to withstand load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, abnormal immediately find reasons to adjust, to return to normal.
First, the spindle of the spindle bearings in operation, to fully ensure lubrication, and regularly add oil according to the actual situation, not long off the oil. So, for the user enterprise, should be used better and more appropriate spindle oil. New special spindle oil can significantly improve the lubrication performance, extended drain intervals, extend the spindle and self-aligning ball bearing life, but also has good rust and corrosion performance.
Secondly, the use of reinforced nylon material bearing cage, temperature should be below 120 ℃, non-oil cooking cleaning.
In addition, the spindle maintenance cleaning method should pay attention to prevent damage, scratches the roller surface. bearing parts to try to clear the residue should be rinsed clean bolster internal suction method is better than oil. Should be taken to avoid the use of cleaning garbage dump type leaving residues accumulate in the bearing area, leading to self-aligning ball bearing noise, wear failure and other problems.

Thrust ball bearings imported process need to pay attention

Imported thrust ball bearings in addition to excellent quality, they are all very precise parts, both high-performance import thrust ball ferris wheel bearing  if used improperly during use, not only fail to achieve performance results, and very easy to import thrust ball bearing damage, in lubrication we certainly have attention.
First, when used carefully to be allowed to install a powerful punch, does not allow a direct hit with a hammer bearing, are not allowed to pass through the rolling pressure.
Second, the use of appropriate, accurate installation tools to make use of special tools, try to avoid using fabric and staple fiber stuff like that.
Third, try to keep clean thrust ball bearings imported and its surroundings smile even invisible dust into the mobile crane bearing  will increase wear, vibration and noise of the bearing.
Fourth, to prevent the import of thrust ball bearings rust bare hands when handling the import thrust ball bearings, to fully wash hands sweat, and coated with high quality mineral oil and then operate in the rainy season and summer with particular attention to prevention rust.
In some special operating conditions, import thrust ball bearings can get a longer life than traditional computing, especially in the light-load conditions. These particular operating conditions that, when the rolling surface (track and rolling elements) are effectively separated and limit pollutants may cause surface damage of a lubricant film. In fact, under ideal conditions, the so-called permanent import thrust ball bearing life is possible.

How to removing bearings

Bearing disassembly is regular maintenance performed bearing replacement. After the demolition, if continued use, or still need to check the status of the bearings of its demolition should be careful when installing the same. Careful not to damage the excavator bearing of the parts, especially the interference fit bearing disassembly, operation difficult.
Designed according to need removal tool is also very important. When removing, according to the drawings research demolition methods, with the condition the order to investigate the bearing, in order to achieve foolproof demolition job.
Removing the outer ring of the outer ring of the interference fit, prior to the housing of the outer circumference of the extrusion screw with a few screws, tighten the screws evenly on one side, while the demolition. These usually cover screw holes blind plugs, tapered roller bearings and other separation-type bearings in a housing block on the shoulders set out several incisions, using pads, with press demolition, or tapping the demolition.
Removal of the inner ring, you can use the press pull easiest. At this point, we should pay attention to your inner bear its pullout. Furthermore, as shown in the drawing tools are mostly La use, regardless of the kind of fixtures, it must be firmly stuck in the inner sides. To do this, you need to consider the size of the shaft shoulder block, or research on machining grooves in the shoulder block to use drawing fixtures.
Large cross roller bearings inner ring disassembly by hydraulic method. The hydraulic pressure to be set through the bearing hole, so that the drawing is easy. Width of bearing the hydraulic method and drawing fixtures and use, disassembly operations.
Cylindrical roller bearing inner ring disassembly can take advantage of induction heating. Local heating in a short time, so that the inner expansion after drawing methods. You need to install a large number of this type of bearing inner ring of the occasion, also uses induction heating method.
I hope shortly before installation, just open the bearing package. General grease lubrication, not clean, direct filling grease. Lubricating oil, general do not wash, however, the instrument used or high-speed bearings, etc., use oil washed clean, removing the coating on the thrust roller bearing

 of the rust inhibitor. Remove the bearing rust inhibitor, rust, it can not be placed aside. Furthermore, a grease-enclosed bearing has not cleaned directly.
Bearing installation method, because the bearing structure, with the condition varies, generally, due to multi-axis rotation, so the inner need interference fit. Cylindrical bore bearings pressed into the multi-purpose presses, or by hot charging methods. Cone of the occasion, mounted directly on the tapered shaft or sleeve installation.
When mounted to the housing, and more generally with the clearance, the outer ring had a surplus quantity, usually pressed into the press or shrink fit method also has cooling installation. With dry ice as the coolant, shrink fit installation of the occasion, moisture in the air will condense on the surface of the bearing. Therefore, the need for appropriate corrosion protection.