There are many types of NAF bearings, and the models and specifications are also various. Due to different application environments, there are certain requirements for the precision of bearings.
NAF precision bearings are classified according to the ISO classification standard: P0, P6, P5, P4, and P2 grades are successively increased, among which P0 is ordinary precision, and the other grades are all high-precision grades. Of course, there are different classification standards, different types of bearings, and their classification methods are different, but the meaning is the same. The performance index of precision bearings stipulates that the cycloid has high vibration accuracy, high-speed operation, and the specified friction and friction change are small.
NAF precision bearings need to be distinguished from general bearings in the following aspects:
1. The specified value of the specification is different. The specification error of the product with high precision level is smaller than the specified value of the product with low precision level.
2. The specified value of rotation accuracy is different. The rotation accuracy of products with high precision grade is stricter than that of products with low precision grade.
3. The specified values of surface appearance and surface quality are different. The surface appearance and surface quality of products with high precision grades are stricter than those of products with low precision grades.
4. The raw materials of products with particularly high precision grades are more beneficial than the material characteristics of products with general precision grades
The traditional main application of precision bearings is the spindle of lathes. According to the different processes, the spindles of lathes have different requirements. Generally speaking, lathe spindles are used for drilling metal materials at low efficiency and large volumes. Machine tool spindles of this type typically transmit propulsive torque via pulleys or rotating gears. This means that the load on the push end of the machine spindle is also very high. This type of application does not have high requirements for efficiency, and the more important parameters are bending stiffness and load carrying capacity.
