The rational selection of application method INA high-precision bearings

Clearance is INA bearing can work normally one of the important factors. Choose appropriate bearing clearance, can make the rational distribution of load between the rolling element; To limit shaft ( Or shell) The axial and radial displacement to ensure the accuracy of the axis of rotation; Make the imported bearing can work normally under the required temperature; Can reduce the bearing vibration and noise at work, etc. , thus, bearing clearance to the bearing life, temperature rise, vibration and noise has a great influence. When choosing the bearing clearance, should be considered in addition to bearing working conditions ( Such as load, speed, temperature, etc. ) And on the properties of bearing use requirements ( Such as friction torque, vibration and noise, rotating accuracy, etc. ) Of the bearing and the shaft and the shell are in clearance decreased; Bearing is working, the difference in temperature between inside and outside ring lead to clearance decreased; Shaft and the shell of the manufacturing material clearance decrease or increase caused by the different expansion coefficient. Using experience has shown that for the work of ball bearing is the most appropriate clearance approximate to zero; For the working condition of roller bearing is the most suitable work should keep a small amount of clearance. In the required supporting rigid good parts ( Such as spindle) , also can have certain numerical preloaded. High precision bearing refers to the rotating accuracy, high dimension accuracy and surface roughness smaller INA bearing, in the standard of our country P4 level and above P4 level bearing, P2 level bearing for high precision bearing, for example, it is roughly standard ABEC 7 and ABEC 9, with the United States and the international standard ISO P2 and P4, international standards recognized by many countries and use, such as Japan, Germany and France, etc. Through precision machining, various types of rolling bearing can meet the high precision requirements, but on the application of high-precision bearings is used most widely in angular contact ball bearing, the high precision and high rigidity requirements of metal cutting machine tool spindle, the use of double row short cylindrical roller bearing is also many, the second is that tapered roller bearings. At present, due to the development of the bearing processing technology, various precision bearing the international level of the actual product error mostly under half of the standard, such as machine tools imported ball bearing of roundness is 0. 3 microns, while computer used to 0. 25μm。 In general, the user at the time of precision bearing type selection, should be first choice from the above three types. And, even in the three types, also is not each specification has precision products production, must also be on each bearing company or factory samples to find, or ask the bearing sales department. Usually, P4 level precision bearing ends up more easily, and P2 level precision INA bearings generally need to pass a special order. For the first time in the production of precision product according to the trial production of new products processing.