Bearings are mainly used in machinery to support and reduce friction, so the accuracy and noise of the bearings are directly related to the use and life of the machinery. But business personnel often encounter some customers, even if they use the best bearings or imported bearings, the efficiency is not high, which is related to the use and selection of bearings.
Some people may say “The use and selection of bearings is the user’s business, I only care what the user wants and I sell what”. However, as a qualified salesperson, in addition to being proficient in product knowledge, he must also be proficient in the use of products, that is, doctor-type sales, and choose the best matching bearings according to the performance and use conditions of the users’ matching products. This is the specialized manufacturing and sales popular among major companies in the world. This method has also achieved good results since its implementation.
Because there are many types of bearings and a wide range, the relevant personnel of Yiyang Longma Bearing Co., Ltd. mainly made some analysis on the use of the most widely used deep groove ball bearings and related precautions. Hope that those who know less about bearings can deepen their understanding of bearings.
Precautions for the use of deep groove ball bearings
- Tolerance selection and control of shaft and bearing chamber: After the bearing is pressed into the bearing, it should rotate flexibly without any sense of blocking. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be lowered. If the bearing is pressed into the shaft and turned by hand, there is an obvious “sand” feeling, it may be because 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, the roundness should also be controlled. At present, many domestic manufacturers only control the tolerance, but do not control the roundness.
- The assembly method of the bearing: Because the bearing is a high-precision product, improper assembly can easily cause damage to the bearing channel and cause damage to the bearing. When assembling the bearing, there should be a special mold, which can not be knocked at will. When the shaft is pressed into the shaft, only the small circle can be subjected to force, and the large circle can only be subjected to force. Air pressure or hydraulic pressure is required when assembling, and the upper and lower molds should be outside the horizontal state during press-fitting. If there is a tilt, the bearing channel will be damaged due to force, which will cause the bearing to produce noise.
- Prevention of assembly foreign matter: When the bearing is installed on the rotor for dynamic balancing, it is easy to enter the iron filings generated during dynamic balancing into the bearing, so it is best to perform dynamic balancing before installing the bearing. For the convenience of assembly, some manufacturers apply some oil or grease to the bearing chamber for lubrication effect during assembly. However, it is often difficult for operators to control the amount. If a large amount of oil or grease accumulates in the bearing chamber, it will be very It is easy to enter the inside of the bearing along the shaft. It is best not to coat the bearing chamber with oil or grease. If it is absolutely necessary, it must be controlled not to accumulate in the bearing chamber.
- Prevention of lacquer rust: The characteristic of lacquer rust is that it mostly occurs in sealed motors. The sound of the motor is very good when assembled, but after some time in the warehouse, the abnormal noise of the motor becomes very large. Remove the bearing. Severe rust phenomenon. In the past, many manufacturers thought it was a bearing problem. After our constant publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substance volatilized from the insulating paint forms corrosive substances at a certain temperature and humidity, which causes bearing damage after corroding the bearing groove. At present, the problem can only be to choose a good insulating paint and ventilate for a period of time after drying and then assemble.
The life of deep groove ball bearings is closely related to manufacturing, assembly, and use. Every link must be done well in order to keep the bearing in the best running state and extend the life of the bearing.
