ERIC Bearings Share How to Selection And Use Of FAG Bearings
Part number selection
The bearing model is generally selected by the user's technical staff according to the use conditions of the supporting products and the load. Business personnel mainly understand whether the actual load of the user is consistent with the selected FAG bearing. If the bearing fails to meet the requirements for use, the customer should be advised to change the model as soon as possible, but unless there are special products in the selection of the model, there is generally no problem.
Choice of Clearance
When purchasing bearings, users generally only tell what type and grade, and rarely ask for the clearance of FAG bearings. Business personnel must ask about the conditions of use of the bearings, the speed, temperature, and tolerance of the bearings are directly related to Selection of bearing clearance. Generally, motors with speeds below 3500 rpm use CM clearance. For high-temperature high-speed motors, relatively large clearances are required. After assembly, the bearing clearance will be reduced due to the expansion of the inner hole and the shrinkage of the outer circle. The reduction of the clearance = interference amount × 60% (except for the bearing chamber is aluminum). For example, the clearance before bearing assembly is 0.01mm, and the interference during assembly is 0.01mm, then the clearance after bearing assembly is 0.004mm. In theory, the noise and life of the bearing reach a good state at zero clearance, but in actual operation, considering the temperature rise and other issues, the FAG bearing has a clearance of 0.002mm-0.004mm after assembly.
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.
Selection of FAG bearing seal type
The lubrication of FAG bearings can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings are generally selected form bearings, grease-lubricated bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good environment. The seals are divided into contact seals and non-contact seals. The contact seals have good dustproof performance but large starting torque, and the non-contact seals have low starting torque but sealing performance No contact is good.
FAG bearings have been professionally manufactured in automobile motor bearings, home appliance motor bearings, motorcycle bearings, health care motor bearings and other industries, so that the noise and life of FAG bearings have reached a good state.
From the perspective of the objective demands of the machine tool industry, angular contact ball bearing electric spindles, liquid (dynamic) hydrostatic bearing electric spindles, and gas bearing electric spindles are not only the focus of market development, but also the focus of academic research. Angular contact ball bearings are the most suitable high-speed rolling bearings. They have the advantages of low friction resistance, low power consumption, low cost, easy serialization and standardization. Its high limit speed, high precision and high rigidity are used in machining centers, CNC milling machines, Lathes, internal grinders and high-speed engraving and milling machines have been widely used, and the main technical difficulty lies in improving accuracy life and reliability. The liquid (dynamic) static pressure spindle is supported by a liquid "oil film", which has a significant "error equalization effect" and damping vibration damping performance. The rotation accuracy is much higher than that of a rolling bearing spindle, which has high rigidity, low wear and long life. It has been widely used in precision ultra-precision machine tools, and its main technical difficulty lies in controlling the temperature rise and thermal deformation of the spindle at high speed. The gas FAG bearing electric spindle is supported by a "gas film", and its rotation accuracy and limit speed are higher than that of a liquid (dynamic) static piezoelectric spindle and rolling bearing type electric spindle. ) The indispensable core component of the drilling machine is that its shortcomings are low bearing capacity and high process requirements.
Magnetic levitation bearings are also an important type of main shaft support. They have high limit speeds and no wear during operation. The technical difficulty lies in how to improve the dynamic stiffness and damping performance, while achieving high speed while ensuring high machining accuracy. The core research content of the magnetic suspension spindle is the control of mechanical system characteristics and electromagnetic characteristics.