With the progress and development of society, mechanization has been widely used in production and life. As an indispensable part of the machine, the range of use of the bearing will become wider and wider, as the bearing is used whenever there is a rotation.
Bearings mainly support and reduce friction in the machine, so the accuracy and noise of the bearings are directly related to the use and life of the machine. However, business people often encounter customers who use the best bearings or imported bearings, and the efficiency is not high, which is related to the use and selection of bearings. Some people may say that "the use and selection of bearings is the user's business, I only want what the user wants me to sell." However, as a qualified salesperson, besides mastering the knowledge of its own products, it must be proficient in the use of products, that is, doctor-type sales, and select the best matching bearings according to the performance and use conditions of the user's accessory products. This is the popular professional manufacturing and sales of major companies in the world. This method has also achieved good results since the implementation of the People's Group.
Because of the wide variety of bearing types, the following will focus on the use and selection of the most widely used deep groove ball bearings. Those who wish to know less about bearings can deepen their understanding of bearings.
First, the choice of bearings
1. Selection of bearing model: The bearing model is generally selected by the user's technical personnel according to the service conditions of the supporting product and the bearing load. 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 re-select the model as soon as possible, but unless the special product is selected on the model, there will be no problem.
2, the choice of bearing clearance: users generally only know what type and grade when buying bearings, rarely ask for the clearance of the bearing, the business personnel must ask about the conditions of use of the bearing, the speed and temperature of the bearing The tolerances are directly related to the choice of bearing clearance. Motors with a speed of 3,500 rpm or less generally use CM clearance. For example, high-temperature high-speed motors require relatively large clearance. After the assembly, the bearing clearance 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% (except for the bearing chamber is aluminum). For example, the clearance before the assembly of the bearing is 0.01 mm, and the interference at the time of assembly is 0.01 mm, and the clearance after the assembly of the bearing is 0.004 mm. In theory, the noise and life of the bearing are at the best state when the bearing is at zero clearance, but in the actual operation, considering the temperature rise and other problems, 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, etc., requiring business personnel to understand the performance of various greases.
4, the choice 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 environment. The seal is divided into contact seal and non-contact seal. The contact seal has good dustproof performance but large starting torque. The non-connected seal has small starting torque but sealing performance. No contact is good.
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