Q&A
Points needing attention for bearing assembly of miniature motor
1. Selection and control of tolerance of shaft and bearing chamber: the bearing should rotate flexibly without block feeling after pressing into the bearing. If there is obvious rotation is not flexible, it indicates that the shaft size is too large, the tolerance should be lowered. If the bearing is pressed into the shaft and rotated by hand, there is an obvious "rustling" feeling, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, roundness should be well controlled when tolerances of shaft and bearing chamber are well controlled. At present, many domestic manufacturers only control tolerances, not roundness.
2, bearing assembly mode: because bearings are high-precision products, such as improper assembly is easy to cause damage to bearing groove, resulting in bearing damage. Bearing should have a special mold when assembling, can not be knocked at will, when pressing into the shaft can only be small circle force, pressure can only be large circle force. When assembling, pressure or hydraulic pressure is required. When pressing, the upper and lower die should be outside the horizontal state. If there is a tilt, the bearing groove will be damaged by force, and the bearing will produce sound.
3, the assembly of foreign body prevention: bearing installed on the rotor to do dynamic balance is easy to dynamic balance produced when the iron filings into the bearing inside, so it is best to load the bearing before doing dynamic balance. Some manufacturers in order to facilitate assembly, assembly in the bearing room coated with some oil or grease to lubricate the effect, but often it is difficult for the operator to control the amount, if the oil or grease in the bearing room is left more, when the bearing is rotating, it is easy to enter the bearing along the shaft. It is best not to oil or grease the bearing room, if not to control the deposit in the bearing room.
4. Prevention of paint rust: paint rust is characterized by many sealed motors. The sound of miniature motors is very good during assembly, but after some time in the warehouse, the abnormal sound of miniature motors becomes very large, and serious rust occurs when the bearings are removed. In the past, many manufacturers will think it is the problem of bearings. After our continuous publicity, now the micro motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized by the insulating paint form corrosive substances at a certain temperature and humidity, leading to bearing damage after corrosion of the bearing channel. This problem can be to choose good insulation paint only at present, be in after drying ventilated assembly after period of time.
Bearing life is closely related to manufacturing, assembly and use. It must be done well in every link to make the bearing in a good running state, so as to extend the service life of the bearing.
2, bearing assembly mode: because bearings are high-precision products, such as improper assembly is easy to cause damage to bearing groove, resulting in bearing damage. Bearing should have a special mold when assembling, can not be knocked at will, when pressing into the shaft can only be small circle force, pressure can only be large circle force. When assembling, pressure or hydraulic pressure is required. When pressing, the upper and lower die should be outside the horizontal state. If there is a tilt, the bearing groove will be damaged by force, and the bearing will produce sound.
3, the assembly of foreign body prevention: bearing installed on the rotor to do dynamic balance is easy to dynamic balance produced when the iron filings into the bearing inside, so it is best to load the bearing before doing dynamic balance. Some manufacturers in order to facilitate assembly, assembly in the bearing room coated with some oil or grease to lubricate the effect, but often it is difficult for the operator to control the amount, if the oil or grease in the bearing room is left more, when the bearing is rotating, it is easy to enter the bearing along the shaft. It is best not to oil or grease the bearing room, if not to control the deposit in the bearing room.
4. Prevention of paint rust: paint rust is characterized by many sealed motors. The sound of miniature motors is very good during assembly, but after some time in the warehouse, the abnormal sound of miniature motors becomes very large, and serious rust occurs when the bearings are removed. In the past, many manufacturers will think it is the problem of bearings. After our continuous publicity, now the micro motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized by the insulating paint form corrosive substances at a certain temperature and humidity, leading to bearing damage after corrosion of the bearing channel. This problem can be to choose good insulation paint only at present, be in after drying ventilated assembly after period of time.
Bearing life is closely related to manufacturing, assembly and use. It must be done well in every link to make the bearing in a good running state, so as to extend the service life of the bearing.