The precision of SKF imported bearing is a standard to measure the quality of an imported bearing, what SKF bearing precision?How do we choose the accuracy of bearings when we choose bearings?To solve this problem, we usually have the following precision grades: P4 dimension accuracy conforms to ISO4 tolerance (more precise than P5 class);The dimension accuracy of P4A conforms to ISO4 tolerance, and the operation accuracy is equivalent to AFBMA standard ABEC9;P5 size and operating accuracy are in accordance with ISO5 tolerance (bearing accuracy is higher than P6);P6 size and operating accuracy equivalent to AFBMA standard ABEC9;PA9A size accuracy equivalent to AFBMA standard ABEC9 level;PA9B's dimensional accuracy is equivalent to AFBMA standard ABEC9 level, and its operating accuracy is higher than PA9A.
Selection criteria of SKF bearing accuracy:
1, audio, video machine spindle (video recorder, tape recorder), radar, parabolic antenna spindle, machine tool spindle, electronic computer, disk spindle, aluminum foil roll journal, multistage rolling mill support bearing general use of the precision level: P4;P5, P4, P2, ABEC9;P5, P4, P2, ABEC9;P5;P4
2. High-speed rotation;The supercharger.Jet engine spindle and auxiliary engine;Centrifuge;Liquefied natural gas pump;Turbine molecular pump spindle, protection bearing;Machine tool spindle;Generally applicable precision grades of tensioning wheel are: P5, P4;P5, P4;P5, P4;P5;P5, P4;P5, P4, P2, ABEC9;P5, P4
3. Require little friction and friction change;Control machine (synchronous motor, servo motor, gyro gimbal);Measuring instrument;Machine tool spindle is generally applicable to the accuracy level: P4, ABMA 7P;P5;P5, P4, P2 and ABEC9
4, general accuracy: small motor, gear transmission device, CAM transmission device, generator, low induction synchronous servomotor, pressure rotor, printer, copier, detection instrument precision grade is generally: P0, P6
Generally only the quality SKF imported bearing precision grade can meet the requirements, the purchase should pay attention to the regular parts of the mark on the appearance of inferior products sometimes good, but because of the poor production process, easy to appear cracks, sand holes, slag, burr or bump.Cylinder pad extrusion deformation, use is easy to cause loose seal and ablation, resulting in oil leakage, gas leakage and water leakage phenomenon;Piston and piston ring working surface with burr easy to pull cylinder.At the same time, also pay attention to the choice of uniform chamfering, rotating noiseless products.
Adjustment is based on the specific requirements of the operation, SKF bearing detection accuracy, while maintaining the accuracy and stability will depend on the relevant preload and lock means and measures to ensure.Hydraulic machines used in the industry, because they use different precision requirements, different, they also adopt different standards of work in the manufacturing sector.In the same industry in the production of different products, the required accuracy can be different.Therefore, in the same industry standard working conditions and different levels are divided into corresponding digital precision indicators.The factory produces the test standard outline and prepares the test outline for accuracy in the newspaper by the technical department, because the authority issues a guidance document, which provides the items, test methods and corresponding data parameters, installation and inspection adjustment and acceptance standard.
Generally includes the accuracy of adjustment items that need to be realized during SKF bearing assembly.If the hydraulic table degree of high and low spacing deviation, activity table, table flatness, vertical upper and lower beam, parallel table between the main cylinder working stroke, with the vertical table, column connecting beam connection between the inner and outer nut mating surface of the upper and lower contact rate.The process and results of SKF bearing accuracy adjustment and testing shall be approved and signed by the full-time personnel.After the peer is incorporated into the scheduled production process, it is detected that the tools and molds designed by professional staff need to be adjusted during the production process.Omit the test framework and test work for tuning.