Protection measures for imported bearings in use | Analysis of the limit speed of imported bearings

Protection measures when imported bearings are used 1. Selection and control of tolerances of shafts and bearing chambers: Koyo imported bearings should rotate flexibly without blocking after being pressed into the bearing. If the rotation is obviously inflexible, it indicates that the size of the shaft is too large and the tolerance should be reduced. If the bearing is pressed into the shaft and rotated by hand, there is a clear 'sand' feeling, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of the shaft and the bearing chamber, it is necessary to control the roundness. At present, many domestic manufacturers only control the tolerance and do not control the roundness. 2. Bearing assembly method: Because the bearing is a high-precision product, improper assembly can easily cause damage to the Koyo imported bearing channel, resulting in bearing damage. The bearing should have a special mold when assembling, and it cannot be beaten at will. When pressing into the shaft, only a small circle can be stressed, and when a large circle is pressed, only a large circle can be stressed. When assembling, it is required to use air pressure or hydraulic pressure. When pressing, the up and down touch should be out of the horizontal state. If it is inclined, it will cause the bearing channel to be damaged by force, which will cause the bearing to generate noise. 3. Prevention of foreign objects in assembly: When the bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balancing into the bearing, so it is best to do dynamic balance before installing the bearing. For the convenience of assembly, some manufacturers apply some oil or grease to the bearing chamber for lubricating effect during assembly, but it is often difficult for operators to control the amount. Easy access to the inside of the bearing along the shaft. It is best not to apply oil or grease in the bearing chamber. 4. Prevention of paint rust: The characteristic of paint rust is that it occurs frequently in sealed motors. The sound of the motor is very good during assembly, but after being placed in the warehouse for some time, the abnormal noise of the motor becomes very large. Severe rusting. In the past, many manufacturers thought it was the bearing problem. After our continuous publicity, the motor factory has now realized that the main problem is the insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances under certain temperature and humidity, which corrode the imported bearing channels and cause bearing damage. At present, the problem can only be to choose a good insulating paint, and assemble it after drying and ventilating for a period of time. Imported bearing limit speed analysis Bearing life refers to the total number of revolutions or the number of working hours at a certain speed before any component in the bearing shows signs of fatigue, spalling and expansion. When the rotating speed of the imported bearing is too high, high temperature will be generated between the friction surfaces, which will affect the performance of the lubricant and destroy the oil film, resulting in the tempering of the moving body or the failure of the element gluing. The limit speed of the bearing refers to the speed value at which the bearing can withstand the highest thermal equilibrium temperature under certain working conditions. The working speed of the bearing should be lower than its limit speed. The limit speed values ​​given in the bearing performance table are determined under the premise of grease lubrication and oil lubrication respectively, and are only applicable to 0-grade tolerance, normal lubrication and cooling, fit with rigid bearing seat and shaft, bearing load P≤0.1C (C is the basic dynamic load rating of the bearing, the radial bearing is only subjected to radial load, and the thrust bearing is only subjected to axial load). When the bearing load P>When the temperature is 0.1C, the contact stress will increase; when the imported Koyo bearing bears the combined load, the loaded moving body will increase, which will increase the friction between the bearing contact surfaces and make the lubrication state worse. At this time, the limit speed value should be corrected.

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