The reason cylindrical roller bearing failure analysis failure

Before cylindrical roller bearings completely destroyed, it provides users find enough time, do not ignore the existence of such friction, it will make riding the rate of decline, so long-distance physical consumption bigger slower. If the surface roughness for fine, if appropriate lubricant film thickness, the probability of surface stress generated quite low, which is why the proper selection of a suitable lubricating oil to reason, however, if the load exceeds the pressure the film's pu value (fatigue load limits, such as high speed, high pressure shock), the fatigue of materials will come sooner or later.
Cylindrical roller bearings metallurgical data quality was once the primary factor affecting early bearing out effective. Followed by metallurgical skills (such as bearing steel vacuum degassing, etc.) to improve the original data quality improvement. Raw material quality factors bearing out the efficiency analysis in the proportion had clearly declined, but it is still one of the main factors bearing out the effect of the impact. Proper selection can still be bearing out the efficiency analysis is necessary to think of the elements.
Cylindrical roller bearings off the primary obligation of efficiency analysis is based on a lot of sets of information, analyze data, and out-efficient way, the primary elements of the bearing to find out the effect of the formation, so that puts forward improved ways to extend bearing service constitutes execution , to prevent the onset of unexpected early bearing off effect.
(1), the impact of cylindrical roller bearing fatigue life factor very much, can not be estimated or through standardized test to eliminate all the premise, which forms bearing fatigue life of the great practice of discrete, thus bearing dejected expression parameter for life extra life L10, R281 in the ISO specification referral understand the meaning of the L10 following rules:
"The number enough thrust roller bearing the same group, with its extra revolutions L10 life (or unchanged by the number of hours to disclose the performance in speed, bearing 90% of the batch before the occurrence of fatigue exploitation can reach or exceed this the number of revolutions (or hours). "So far, the world's nations are subject to the above rules.
In the United States and other countries, and also with the use of the concept of the value of life. Median life means a group of the same LM cylindrical roller bearings of the median life, meaning 50% of a bearing before fatigue spalling can reach or exceed the total number of revolutions or rotational speed of the tasks in a number of inevitable from time to time, the value LM bearing life is not the life of a group of arithmetic uniform value. The median life expectancy of ordinary LM is about five times the extra life.
(2), the concept of extra life together only for a sufficient number of the number of bearings, and the sub for a single bearing.
40 sets of 6204 patients if their use shall be regarded as bearing its lifetime 1000h without additional episodes dejected destroyed, the other four sets is possible that less than 1000h showing off dejected efficient excavator bearing, meaning extra fatigue life on behalf of these cylindrical Roller bearings in the information to develop their potential to the normal life of hope. Thus greatly in both conditions, the user selects the cylindrical roller bearing fatigue life is still first for accounting, and then based on the practice of checking out the effect of categories, such as checking the wear life, take the smaller value accounting consequences bearing life calculation .
The reason cylindrical roller bearings in advance damaged (improper lubrication)
Although you can install the "maintenance" of the rubber seal bearing, but the early failure of the bearings are still 36 percentage is due to the incorrect application of grease caused.
Any improper lubrication of cylindrical roller bearings, early failure are inevitable, due to the plastic hub ball and roller combined bearing is not easy to dismantle the site, and congenital incorrect use grease, while later use without replacing the grease, or not promptly replaced after deterioration pollution carbonized grease, your hub is difficult to have a sufficiently long life and good lubrication.

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.