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TIMKEN bearings "common damage methods" and "fundamental sweeping methods"
Source: China Bearing Network Time: 2013-05-07
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2. Know the abnormal phenomena when damage and near damage; especially the appearance and evolution of noise and heat, pay attention to the power supply and the adjacent mechanical components of the bearing during this period, whether there is an abnormal phenomenon. Analyze the type of noise; The frequency of the disturbance rhythm: pay attention to when the temperature is suddenly added, etc.; write down the status of the power supply and other parts,
3. Clarify the equipment characteristics and cooperation features of the bearings in the main engine; determine whether it can be properly equipped; record the orientation of the ferrule relative to the outer casing and the orientation relative to the load direction.
4. Manually rotate the shaft together with the damaged bearing for several turns to experience the heavyness of the work; then push the shaft back and forth several times in the axial direction to understand the tightness of the shaft along the axial direction; if necessary, measure the deflection of the shaft,
5. View the location of the TIMKEN bearing; identify the smoothness, condition and pollution status; review the smoothing agent trademark and sealing method for errors; focus on the temperature rise condition; whether the bearing temperature can exceed the temperature limit of the smoothing agent used; Position bump; whether the seal gap can leak oil and grease; and whether moisture, dust and other foreign matter can invade the bearing; Observe whether there is an oscillator source that affects the bearing. A source of debris or particles, a source of water or fluid contamination, a current source that can flow through the bearing,
7. According to the status of the inspection; can be used as a basis to determine the damage of the TIMKEN bearing is because fretting corrosion, wear, corrosion is still electrical erosion.
First, the method of diagnosis of bearing defects and the key to the condition monitoring of the bearing and the diagnosis of fault diagnosis is a vibration analysis.
It is necessary to pay attention to the accurate and accurate collection of signals; in the usefulness, it is necessary to pay attention to the selection of the orientation and collection method of the measuring points. In order to accurately reflect the oscillation condition of the TIMKEN bearing, it is necessary to organize the measuring points from the local bearing; the motor is usually free. Electric fan cover; its measuring point is selected in the electric fan cover fixing screw has a good monitoring function. Others must pay attention to the repeated collection and analysis of the oscillating signal; inductive comparison. Talent is finely determined.
Second, the normal operation of the bearing features and useful diagnosis of the Tuen Mun bearing in its application process shows a strong regularity; temporary production status monitoring found. And repeatability is very good. Normal high quality TIMKEN bearing at the beginning of use; oscillation and noise All are compared. The lamp is smashed 18. The ring is slashed and smashed. The beggar is smashed.
The oscillation and noise are kept at a certain level; after a period of motion, the spectrum is very simple; only one or two times the frequency is present. The spectrum of three times more power frequency is rarely presented; the bearing condition is very stable;
The bearing oscillation and noise start increase; after continuous operation, it enters the late stage of operation. Sometimes it shows an abnormal sound; but the change of the oscillation increase is slower; at this moment; the bearing kurtness value starts to reach a certain value. It is thought that the TIMKEN bearing is the initial stage. Faulty.
The bearing is closely monitored for demand; at this time, close attention is paid to its change. Thereafter, the bearing kurtosis value is rapidly decreased at the beginning; and is close to the normal value; and the oscillation and noise start are significantly increased; When the oscillation crosses the oscillation standard (such as ISO 2372 standard), its bearing kurtosis value also starts to increase rapidly; when it crosses the oscillation standard; and the kurtosis value also crosses the normal value (the available kurtosis relative standard); that the bearing has entered the late stage Hair disease; need to repair equipment in time; replace the bearing.
The greater the capacity of the equipment; the bearing indicates the late-stage fault characteristics to the serious problem (usually bearing damage such as shaft, burn, sand frame spalling, raceway, bead wear, etc.), which does not exceed one week. The faster the speed; The shorter the interval is. Therefore, the practice of bearing defects is diagnosed; once the late fault characteristics are found; the bearing should be judged to be faulty;
Third, the abnormal operating characteristics of the bearing and the diagnosis of the tricks and the serious problems caused by these active bearings are often sudden and catastrophic, such as bearing cracks, cracks, internal and external ring cracking, etc.; now because of counterfeit and inferior bearings will inevitably enter the company and Equipment. These problems will form the rotor holding shaft; the heavy one will cause the rotor or equipment to be invalid. In recent years, I have often encountered such conditions in practice. Therefore; practice monitoring and diagnosis; must quickly diagnose the bearing condition; Replace shoddy bearings; avoid major incidents. Many of these kinds of things; also accumulated some useful tips; that is, such bearings in the initial operation of the equipment; monitor its oscillation; and perform spectrum analysis. Found that the bearing is in the early stage of operation; The spectrum has its common features; that is, the power frequency of the equipment usually does not occupy the primary component. However, the total value of the oscillation is not large; using the oscillation standard (such as the ISO 2372 standard) to discriminate that the oscillation is qualified will cause me to be alert; at this moment, this situation indicates TIMKEN bearing parts have shortcomings, etc.; their failures are often very fast and very awkward. The above example is the rotor two hours after the measurement is completed. Axis.
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