TIMKEN bearings are precision parts and require a very cautious attitude when used. That is, the use of high-performance bearings can not achieve the expected performance if not used properly, and it is easy to damage the outer spherical bearings. Most of the bearings are damaged for many reasons - beyond the original estimated load, non-effective seals, too tight bearing clearance caused by too small bearing clearance. Any of these factors have their particular type of damage and leave a special mark of damage.
Therefore, inspection of damaged bearings can be found in most cases. In general, one-third of TIMKEN bearing damage is caused by fatigue damage, and the other third is due to poor lubrication. The other third is due to contaminants entering the outer spherical bearing or improperly installed.
Therefore, what we want to talk about is how to protect it and extend its service life. Who is unwilling to make the bearing wear-resistant and durable? Unless your nerves have problems (hehe), you should pay attention to the following matters when using bearings:
If the bearing is used improperly during operation, it will cause a series of problems, so we should pay attention to these problems in order to find the problem and solve the problem in time to ensure the normal use of the bearing. Under normal circumstances, the outer spherical bearing should pay attention to the following three major matters during operation.
First, check the condition of the running machine and monitor it to avoid equipment downtime.
Second, if the TIMKEN bearing is under-lubricated or over-lubricated, the lubricant contains magazines, the load is too large, the outer spherical bearing is damaged, the gap is insufficient, and the high-temperature friction generated by the oil seal is the same.
High temperatures often indicate that the bearing is in an abnormal condition. High temperatures are also detrimental to the lubricant in the bearing. Sometimes bearing overheating can be attributed to the bearing's lubricant. If the bearing is operated for longer than 125 degrees Celsius, it will reduce bearing life.
Third, it is best to check the TIMKEN bearing and periodically check the oil seal when opening the bearing housing. Check the condition of the oil seal near the bearing to ensure that they are sufficient to prevent hot liquid or corrosive liquid or gas from penetrating into the outer spherical bearing along the shaft. If the bearing is well lubricated and properly blocks debris and moisture, the oil seal should be absent. Wear. If the oil seal has worn out, it should be replaced as soon as possible.
2019年8月25日星期日
FAG spherical roller bearing damage maintenance measures maintenance method
1, the cleaning of the bearing
When disassembling the lower roller bearing for inspection, first record the appearance of the FAG bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the FAG bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
Fine washing is to carefully clean the spherical roller bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Inspection and judgment of bearings
In order to judge whether the disassembled spherical roller bearing can be reused, it is necessary to check after the bearing is cleaned, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the FAG bearing clearance and Whether there are damages or abnormalities in which the dimensional accuracy is lowered. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as spherical roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.
Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of FAG bearings, the more careful inspection is required.
The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects are not available, the new spherical roller bearings must be replaced:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) rupture on any of the ferrules and rolling elements;
(c) Significant jams on the raceway surface, ribs and rolling elements;
(d) the cage is worn significantly or the rivet is significantly slack;
(e) There is rust and injury on the raceway surface and the rolling elements;
(f) There are severe indentations and marks on the raceway surface and rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) Bearings sealed with grease, the seal or dust cover is damaged.
If there is no choice error and can be used correctly, it can be used for a long time before the end of the life of the FAG bearing. In this case, the damage state of the general spherical roller bearing is peeling. On the other hand, there are accidental early damage, and early damage that cannot be used as a cause of this early damage.
The specific reasons are insufficient consideration for use and lubrication, as well as foreign matter intrusion, bearing assembly error and shaft deflection, and insufficient research on the shaft and bearing housing. It can be said that these reasons overlap with each other. Therefore, we recommend that you choose the size of the bearing according to the life formula of the FAG bearing, and on the basis of the machine used in the demodulation of the heart roller bearing, the conditions of use, and the structure of the outer periphery of the bearing, if the situation before and after the accident can be clarified, Combined with the damage of the bearing and various reasons, it can prevent the recurrence of similar accidents.
When disassembling the lower roller bearing for inspection, first record the appearance of the FAG bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the FAG bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
Fine washing is to carefully clean the spherical roller bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.
2. Inspection and judgment of bearings
In order to judge whether the disassembled spherical roller bearing can be reused, it is necessary to check after the bearing is cleaned, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the FAG bearing clearance and Whether there are damages or abnormalities in which the dimensional accuracy is lowered. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.
Separate bearings such as spherical roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.
Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of FAG bearings, the more careful inspection is required.
The judgment of whether or not to reuse is determined in consideration of the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. However, if the following defects are not available, the new spherical roller bearings must be replaced:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) rupture on any of the ferrules and rolling elements;
(c) Significant jams on the raceway surface, ribs and rolling elements;
(d) the cage is worn significantly or the rivet is significantly slack;
(e) There is rust and injury on the raceway surface and the rolling elements;
(f) There are severe indentations and marks on the raceway surface and rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) Bearings sealed with grease, the seal or dust cover is damaged.
If there is no choice error and can be used correctly, it can be used for a long time before the end of the life of the FAG bearing. In this case, the damage state of the general spherical roller bearing is peeling. On the other hand, there are accidental early damage, and early damage that cannot be used as a cause of this early damage.
The specific reasons are insufficient consideration for use and lubrication, as well as foreign matter intrusion, bearing assembly error and shaft deflection, and insufficient research on the shaft and bearing housing. It can be said that these reasons overlap with each other. Therefore, we recommend that you choose the size of the bearing according to the life formula of the FAG bearing, and on the basis of the machine used in the demodulation of the heart roller bearing, the conditions of use, and the structure of the outer periphery of the bearing, if the situation before and after the accident can be clarified, Combined with the damage of the bearing and various reasons, it can prevent the recurrence of similar accidents.
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