How to improve FAG bearing shaft support rigidity skills

Source: China Bearing Network Time: 2014-05-13

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(1) For the bearing-like external appearance of the bearing shaft and the bearing device on the seat hole; the lower the surface roughness; the better the shape and bearing accuracy; the higher the bearing rigidity obtained. Advantageously progressive rigidity. Use high-hardness plugs with very low roughness; repeatedly press in and out of the seat hole in a smooth condition with a certain interference; also help to improve the support rigidity; if necessary, the snap ring can be used The neck is treated similarly.
(2) Using the bearing pre-tightening method to improve the bearing rigidity, the ball bearing or the tapered roller bearing can adopt the axial pre-tightening method; and for the short cylindrical roller bearing, the radial pre-tightening method can be adopted; the rigidity of the shaft bearing can be significantly improved. At this moment, the bearing clearance may be eliminated; perhaps a small negative clearance is obtained. However, the speed is not too high; the temperature rise is not too large; the best should be adjusted to a small negative clearance condition. When preloading is applied; the deformation condition should be continuously measured; pay attention to the low value of deformation; the deformation is linear with the addition of the preloading load, and during the high value; the deformation is linear with the addition of the load. Once deformed A load presents a linear relationship; the preloading load is immediately discontinued; a stable stiffness is obtained at this point. After that; there is a fixed relationship between the axial stiffness of the bearing and the radial stiffness; it does not depend on the applied load. Measure the amount; use, for example, to place the dial gauge against the appropriate end of the bearing end face or shaft; investigate the way the reading changes with the preload load. The preload method has its helium aspect; for example, the conflicting moment of the bearing Large, progressive temperature rise, the number of life shortening; therefore need to think about all; trade-offs; selection of the appropriate amount of preload.
(3) The bearing equipment of the bearing has a great influence on the bearing rigidity; generally speaking; the ball bearing and the roller bearing of the centripetal thrust type; in the paired application, the large end face of the outer ring should be adopted (ie, the pressure thereof) The line consists of the pressure cone tip outward; the ability to equip the bearing against overturning torque is large; the amount of preload that is adjusted when the temperature changes is less changed.
(4) Select the multi-bearing support method under the condition of axial orientation; use two or more bearings for each support as radial support; improve the support rigidity. For example, it is used in the spindle parts of machine tools; Axial support with axial preloading device; several sets of radial thrust bearings as the same fulcrum

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