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Discriminating IKO's operational rules and fault analysis
Source: China Bearing Network Time: 2017-11-16
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At this time; it is necessary to closely monitor the rolling bearing; pay close attention to the change; after that; the bearing kurtosis value starts to decrease rapidly; and approaches the normal value; and the oscillation and noise start increases significantly; When the oscillation exceeds the oscillation specification (such as the ISO 2372 specification); its bearing kurtosis value also begins to increase rapidly; when it exceeds the oscillation specification; and the kurtosis value also exceeds the normal value (available kurtosis relative specification); we think The bearing has entered the late stage of disease production; it is necessary to repair the equipment in time; replace the rolling bearing.
Rolling bearings show late-stage fault characteristics to present serious problems (usually IKO bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) do not exceed one week; the larger the equipment capacity; the faster the speed; The shorter the interval is. Therefore, in the practice of rolling bearing fault diagnosis; once the late fault characteristics are found; the bearing should be judged to be faulty;
1. Selection and control of the shaft and bearing public service After the bearing is pressed into the bearing, it should be changed to be sensitive and unblocked. If there is significant change, it is not sensitive; then the scale of the shaft is too large; the public service should be lowered. For example, the bearing is pressed. There is a significant "sand" feeling after the shaft is changed by hand; it may be that the public service of the shaft is too large or the roundness of the shaft is not good. Therefore, it is also necessary to control the roundness when manipulating the shaft and the bearing.
2, the installation method of the bearing because IKO bearing is a high-precision product; if the installation is not easy, it is very simple to damage the bearing channel; cause damage to the bearing. The bearing should have a special mold when installing; can not be hit at random; When only pressing a large circle, it can only be subjected to a large circle. When installing, it is required to use air pressure or hydraulic pressure; when pressing, the upper and lower touches should be outside the horizontal condition; if there is a skew, the bearing channel will be affected by force. Damage; and cause the bearing to make a sound.
3, the installation of foreign objects to avoid the bearing on the rotor to do the dynamic balance is very simple to the iron balance occurred in the dynamic balance into the bearing inside; therefore the best is to install the bearing before the dynamic balance. Some manufacturers for installation convenience; installation Apply some oil or grease to the bearing chamber to smooth it; but it is often difficult for the operator to control the amount; if oil or grease accumulates in the bearing chamber; it is very easy to enter the bearing inside the bearing when the bearing changes. Bearing The best thing is not to apply oil or grease; if it is not painted, it must be handled without accumulation in the bearing chamber.
4, paint rust to prevent paint rust is often in the sealed motor; the motor sounds very good when installed; but after some time in the warehouse; the motor noise is very large; the removal of the bearing is severe Rusted appearance. Many manufacturers once thought it was a bearing problem; now the motor factory has realized that it is the primary problem of insulating varnish; the problem is mainly because the acidic material evaporated by the insulating varnish is corrosive under certain temperature and humidity. The material; the IKO bearing is damaged after the bearing channel is corroded. The problem can only be selected by using a good insulating paint; and it is installed after drying for a while.
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