Introduces a precision miniature bearings NMB difference and accessories required

Introduces a precision miniature bearings NMB difference and accessories for precision miniature bearing according to the classification standard of the ISO can be divided into: P0, P6, P5, P4, P2. Higher level in turn, which is suitable for ordinary precision P0, other grades are precision level. Of course, different classification standard, the different types of bearings, their classification method is different, but the significance is one to. Precision bearing using the performance requirements of revolving beating with high precision, high speed rotation and friction and low friction change. Miniature bearing has extensive USES. Suitable for high-speed rotation, low friction torque, low vibration, low noise requirements of the product. Miniature bearing is suitable for all kinds of industrial machinery, small rotary machine, etc. , such as fan motors, micro motors, soft drive, encoder, video recorder drum etc. The author to introduce precision miniature bearing is different from other ordinary bearing special, and some parts of desire! A, precision bearings and plain bearing should to distinguish from the following points: 1, the required values are not the same size, high precision grade product size deviation ( Inside diameter, outside diameter, elliptical, etc. ) Lower than the accuracy grade of the value of the product requirements to small; 2, rotation accuracy requirements are different, the product with high precision grade the rotation accuracy ( Radial runout, outer diameter to the beat, end face a race to beat, etc. ) Lower than the accuracy grade of product value to strict; 3, surface shape and surface quality is not the same as the required value, high precision grade of the surface shape and surface quality ( Race or surface roughness of the channel, circular deviation, furrowed deviation, etc. ) Than the accuracy of low level of a product's value to strict; 4, particularly high precision grade products its material is better than general precision grade products of material performance. In general, the precision of the rolling bearing finished product level can be divided into the following six level ( From low to high) : 0; 6; 6 x; 5; 4. 2. Precision bearing requirement for matching parts: due to the precision of the precision bearing itself within the 1 mu m, therefore require matching parts ( Shaft, bearing and end cover, collar, etc. ) Have high dimensional accuracy and shape accuracy, especially fitting surface accuracy to control inside and bearing the same level, it is crucial, and also the most easily overlooked. Must also pay attention to the matching precision bearing parts if not meet the above requirements, often makes precision bearing in times larger than the original bearing error occurred after installation, even more than 10 times error, completely not be precision bearing, the reason is that the error of the matching part is often not simply by adding up the error of the bearing, but added in different multiples enlarged.