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Detailed description of the use and selection of "motor bearings"
Source: China Bearing Network Time: 2018-01-06
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Bearings in the machinery are mainly to support and reduce the friction; so the bearing accuracy, noise, etc. are directly related to the use of machinery and life. But business people often encounter some customers that use the best bearings or imports The power of the bearing is not high; this is related to the application and selection of the bearing. Some people may say that "the use and selection of the bearing is the user's business; I only want the user to sell me."
However, as a qualified salesperson, in addition to knowing the common sense of the product itself, it is also necessary to know the use of the product; that is, the sale of the physician type; according to the function and application conditions of the user's accessory products, the best matching bearing is selected. This is the current world. The professional production and sale prevailing in large companies; this method has also played an outstanding role in the implementation of the People's Group.
Due to the wide variety of bearing types, the following will be the first to analyze the application and selection of the most widely used deep groove ball bearings. It is expected that people who know less about bearings can deepen their knowledge of bearings. Selection of bearing type: The bearing type is usually selected by the user's technician according to the operating conditions of the supporting product and the receiving load. The business personnel first know whether the user's practical load can match the selected bearing; if the bearing does not reach Use the demand; should promptly advocate the type of customer reorganization; but unless the special product is usually not a problem in the selection type.
2. Selection of bearing clearance: When users purchase bearings, they usually only report the type and grade of the bearing; there is little demand for the clearance of the bearing; it is necessary for the business personnel to ask about the operating conditions of the bearing, the speed and temperature of the bearing. Cooperative public service is directly related to the selection of bearing clearance. Generally, most of the motors with a speed of 3500 rpm or less use CM clearance; for high-temperature high-speed motors, a relatively large clearance is required. Bearing clearance after installation It will be reduced due to the increase of the inner hole and the reduction of the outer circle; the reduction of the clearance = the interference amount × 60% (the bearing chamber is aluminum). The ratio of the bearing before installation is 0. 01mm; The interference is 0. 01mm; the clearance after the bearing is installed is 0. 004mm. In theory, the noise and the life of the bearing are at the best condition when the bearing is at zero clearance; but the temperature rise is considered in practice. The bearing has a clearance of 0. 002mm-0.004mm after installation.
3, the choice of bearing seal type: the smoothness of the bearing can be divided into oil smooth and grease smooth. Oil smooth bearing is usually the choice of bearing; grease smooth bearing is usually sealed with dust cover or rubber seal. Dust cover is suitable for high temperature or The use of the environment is good; the seal is divided into two types: touch seal and non-touch seal; touch seal has good dustproof function but large starting torque; non-connected seal starting torque.
Second, the bearing should pay attention to matters 1. Bearing installation method: Because the bearing is a high-precision product; if the installation is not easy, it is very simple to damage the bearing channel; incurs bearing damage. The bearing should have a special mold when installing; Freely hit; only a small circle of force when pressing the shaft; only a large circle of force when pressing the large circle. The air pressure or hydraulic pressure is required for installation; the upper and lower molds should be outside the horizontal condition during press-fit; Will cause the bearing channel to be damaged due to force;
2. Selection and control of the shaft and bearing chambers: After the bearing is pressed into the bearing, it should be changed to be sensitive and unobstructed. If there is significant change, it is not sensitive; then the scale of the shaft is too large; the public service should be lowered. After pressing into the shaft, there is a significant "sand" feeling 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, the roundness should be controlled when the shaft and the bearing chamber are operated. At present, many domestic manufacturers only control the public service; there is no control on the roundness.
3, the avoidance of paint rust: the characteristics of paint rust is mostly in the sealed motor; the sound of the motor is very good when installed; but after some time in the warehouse; the abnormal noise of the motor is very large; Severe rusting appearance. Many manufacturers once thought it was a bearing problem; through our constant publicity; now the motor factory has realized that it is the primary problem of insulating varnish. The problem is mainly due to the acidic substance evaporated from the insulating varnish. Corrosive substances are formed under temperature and humidity; the bearing channel is corroded and the bearing is damaged. The problem can only be selected from good insulating paint; and it is installed after drying for a while.
4. Avoidance of installing foreign objects: When the bearing is mounted on the rotor to make dynamic balance, it is very simple to insert the iron filings that occur during dynamic balancing into the bearing; therefore, the best is to balance the load before loading the bearings. Some manufacturers are convenient for installation; Apply some oil or grease to the bearing chamber to smooth the effect; 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 along the shaft when the bearing changes. The best part of the bearing chamber is not to apply oil or grease; if it is not painted, it must be handled without accumulation in the bearing chamber.
The life of the bearing is closely related to the production, installation and operation; it is necessary to do it at every stage; in order to make the bearing in the best working condition; then extend the service life of the bearing.
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