How is bearing accuracy differentiated?
The key to bearing tolerance levels is to be determined by the shaft to support point rotational accuracy.
Level 0: It is generally used for bearing systems with rotational accuracy over 10 microns, and the application is very common. For example, the speed regulating mechanism on ordinary CNC lathe, the tool walking mechanism, the speed regulating mechanism of car, the speed regulating mechanism of big tractor, the rotating mechanism of ordinary chemical machinery such as motor, centrifugal pump and agricultural machinery.
Level 6, 5: in the rotating precision in 5-10 microns or higher speed bearing system, such as the common bearing of CNC lathe (front support point 5 level, rear support point 6 level), finer instrumentation, instrument panel and its instrumentation, instrument panel rotating mechanism.
Level 4, level 2: in the super instrumentation, such as fine coordinate milling machine, fine grinding machine drive gear system software, such as instrumentation, instrument panel and high-speed camera, etc., rotational accuracy of no more than 5 microns, the speed is relatively high. China bearing the old code before the accuracy level code.
Internationally developed codes are in accordance with ISO standards, generally unified with ISO, and some are more stringent.
In China before the bearing code regulations are: G level (0), E level (6), D level (5), C level (4), B level (2). The current standard codes generally use the German DIN specifications.
(a) P0(0),P6(6),P5(5),P4(4),P2(2) grade(2). Common specifications grade P0, reflected in the bearing type specification is omitted, only P6 or P6 above grade, grade code appears in the bearing type specification.
For example: 6205 and 6205/P5, where the accuracy grade of 6205 is P0, just omitted. In this way to introduce you, P0 grade is the image of non-accuracy grade bearings.
In addition, various accuracy bearings are separated differently in the process, and different in the use value. For example, the use value of HRB bearing in China, the accuracy is 1.5 times of P6, 2 times of P5, 2 times of P4, 2 times of P5, 2.5 times of P5.
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