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With the progress and development of society, mechaniza […]
With the progress and development of society, mechanization is widely used in production and life. Bearings, as an indispensable part of machinery, will be used more and more widely, because bearings are used as long as there is rotation.
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 about 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 user's matching products. This is the professional manufacturing and sales popular among major companies in the world. This method has also achieved good results since the implementation of the Group.
Because of the wide range of bearing types, the following will mainly make some analysis on the use and selection of deep groove ball bearings, which are the most widely used. I hope people who know less about bearings can deepen their understanding of bearings
The choice of bearing
1. Selection of bearing model: The bearing model is generally selected by the user's technical personnel according to the service conditions and load bearing of the supporting products. The business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the bearing does not meet the requirements for use, the customer should be advised to change the model as soon as possible, but unless there is a special product in the selection of the model, there will generally be no problems.
2. Selection of bearing clearance: When purchasing a bearing, users generally only inform about the model and grade, and rarely ask for the clearance of the bearing. The business person must ask about the bearing's operating conditions, the speed and temperature of the bearing. , Fit tolerances are directly related to the choice of bearing clearance. Generally, motors with speeds below 3500 rpm mostly use CM clearance, such as high-temperature and high-speed motors require relatively large clearance. After assembly, the bearing clearance will be reduced due to the expansion of the inner hole and the shrinking of the outer circle. The reduction of the clearance = interference × 60% (except the bearing chamber is aluminum). For example, the clearance before assembly of the bearing is 0.01mm, and the interference during assembly is 0.01mm, then the clearance after assembly of the bearing is 0.004mm. In theory, the noise and life of the bearing reach the best state when there is zero clearance, but in actual operation, considering the temperature rise and other issues, the clearance of the bearing after assembly is preferably 0.002mm-0.004mm.
3. The choice of grease: The choice of grease is generally based on the bearing speed, temperature resistance, noise requirements and starting torque. The business personnel are required to have a good understanding of the performance of various greases.
4. Selection of bearing seal type: bearing lubrication can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings are generally selected form bearings, and grease-lubricated bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good use environment. The seals are divided into contact seal and non-contact seal. Contact seal has good dustproof performance but large starting torque, and non-connected seal has small starting torque but sealing performance No contact is good.