composite bearing most prone to failure
composite bearing in the work because the journal and the contact with the bearing pad will conflict, resulting in the appearance of heat, wear and even "killed", so in the planning of bearings, should be used to improve friction and friction of the composite bearing material, select the appropriate lubrication And the use of appropriate supply methods to improve the bearing structure to obtain thick film lubrication. The same time as
1, tile surface corrosion: spectral analysis found that non-ferrous metal element concentration anomalies; iron spectrum shows a lot of non-ferrous metal components of the sub-micron wear particles; lubricating oil water overrun, acid value overrun. The same time as
2, the journal surface corrosion: spectral analysis found that iron concentration anomalies, iron spectrum has many iron components of submicron particles, lubricating oil overage or acid value overrun. The same time as
3, journal surface strain: iron spectrum in the iron cutting abrasive particles or black oxide particles, metal appearance of the presence of tempering color.
4, tile back fretting wear: spectral analysis found that iron concentration anomalies, iron spectrum in many iron components submicron wear particles, lubricating oil moisture and acid value anomalies. The same time as
5, the bearing surface strain: iron found in the cutting abrasive, abrasive composition of non-ferrous metals. The same time as
6, tile surface off: the iron spectrum found that there are many large-scale wear off the wear and tear particles, layered abrasive particles. The same time as
7, bearing burning tile: iron spectrum in a large number of large-scale alloy abrasive and ferrous metal oxide.
Bearing in the work to allow a slight operation of the sound, if the sound is too large composite bearing or abnormal noise or crash, then the composite bearing is faulty. Rolling bearing noise causes more complex, one is the bearing, the outer ring with the surface wear. As a result of this wear and tear, damage the bearing and shell, bearing and shaft with the relationship, resulting in the axis deviation from the correct position in the shaft when the high-speed movement of copper sets produce abnormal sound. When the bearing fatigue, the surface of the metal peeling off, but also the bearing radial clearance increased abnormal sound. In addition, ina bearing lubrication is insufficient, the formation of dry friction, and bearing broken, etc. will produce abnormal sound.
Composite bearing wear loose, the cage loose damage, but also self-lubricating bearing abnormal sound In the operation of the body, the installation of the bearing parts allow a certain temperature, when the hand touch the body shell, should not feel hot as normal , Otherwise it shows that the bearing temperature is too high. Lubricant quality does not meet the requirements or deterioration, the viscosity of the lubricating oil is too high; the assembly is too tight (gap is insufficient); ina bearing assembly is too tight; composite bearing race in the shaft or shell rotation; load is too large; bearing cage or Rolling body fragmentation and so on. From the peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the vibration measurement of ina bearings, bearing vibration on the bearing damage is very sensitive, so by using a special composite bearing vibration measuring device (frequency analyzer Etc.) can measure the size of the vibration, through the frequency can not be inferred from the specific circumstances of the exception.
Since the measured values are different depending on the conditions of use of the bearings or the position of the sensor installation, it is necessary to determine the judgment criteria after analyzing and comparing the measured values of each machine in advance. Because the ina bearing even if there is a slight divestiture damage, but also issued an abnormal sound and irregular sound, so the sound can be used to distinguish, the use of sounder, the operation of the composite bearing rolling sound size and sound quality to check , Play the role of early prevention. If the use of oil hole can be directly measured bearing outer ring temperature, the more appropriate. Under normal circumstances, ina bearing the temperature, generally based on the bearing outside the room temperature can be inferred. If the lubrication, the installation of appropriate, then the bearing temperature will rise abruptly, there will be abnormal high temperature, then must stop running, take the necessary precautions. Typically, the bearing temperature starts to rise slowly as the operation begins, reaching a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If necessary, the use of thermal sensors can be monitored at any time the working temperature of composite bearing, and to achieve the temperature exceeds the specified value when the police automatically stop or stop the prevention of combustion shaft accidents.