The accuracy of angular contact ball bearings is divided into specification accuracy and rotational accuracy. Divided into 0 degrees, 6X degrees, 6 degrees, 5 degrees, 4 degrees, 2 degrees. 1. Grade 0: It is generally used for bearing systems with rotation accuracy exceeding 10 μm, and is widely used. For example, the speed change mechanism in the general machining center, the feed mechanism, the speed change mechanism of the car, the speed change mechanism of the large tractor, the rotation mechanism of general chemical machinery equipment such as electric motors, centrifugal water pumps and agricultural machinery. 2. Grades 6 and 5: in high-precision bearing systems with a rotation accuracy of 5-10 μm or a relatively high speed ratio, such as spindle bearings in machining centers (grade 5 for the front fulcrum and grade 6 for the rear fulcrum), finer experimental instruments , In-vehicle instrument panels and instrument panels, in-vehicle instrument panels and high-precision rotating mechanisms. 3. Level 4, Level 2: In super instrument panels, such as fine coordinate CNC lathes, gear shaft systems of precision CNC grinding machines, such as instrument equipment, in-vehicle dashboards and high-speed cameras, the rotation accuracy must not exceed 5 μm, and the speed ratio is very high. The old number accuracy level number before our country's bearings. Angular contact ball bearing standards formulated by countries all over the world are formulated in accordance with ISO standards, generally unified with ISO, and some are very strict. The previous numbering requirements for angular contact ball bearings in our country are: G grade (0), E grade (6), D grade (5), C grade (4), B grade (2). The current standard code generally adopts the German DIN specification. (a) P0(0), P6(6), P5(5), P4(4), P2(2) level(2). The general specification grade P0 is omitted when it is reflected in the bearing model specification. Only for P6 or above grades, the grade number appears in the bearing model specification. Only when the torque is accurate can the rotation be stable! (http://)
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