How to improve FAG bearing shaft support rigidity skills
2023-08-04 04:08:26
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How to improve FAG bearing shaft support rigidity skills
Source: China Bearing Network Time: 2014-10-08
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(1) For the FAG bearing-like external appearance, the FAG bearing device on the shaft and the seat hole; the lower the surface roughness; the better the shape and orientation accuracy; the higher the support rigidity is. Enhanced treatment; favorable progressive rigidity. Use high-hardness plug with low roughness; repeatedly press in and out of the seat hole under smooth condition with a certain interference; also help to improve the support rigidity; Similar treatment of the journal.
(2) Using the FAG bearing pre-tightening method to improve the bearing rigidity. FAG ball bearings or FAG tapered roller bearings can adopt the axial pre-tightening method; for short cylindrical roller bearings, etc., the radial pre-tightening method can be adopted; The rigidity of the shaft support; 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 and fall are not large; the best should be adjusted to a small negative travel. Gap condition. When preloading is applied; it is necessary to continuously measure its deformation state; pay attention to the low value of deformation; the deformation is linear with the addition of preloading load, while the value of deformation is linear with the addition of load. Once the deformation-load has a linear relationship; the preloading load is immediately discontinued; a stable stiffness is obtained at this point. Afterwards; there is a fixed relationship between the axial stiffness and the radial stiffness of the FAG bearing; Applied load. The above deformation amount can be measured by, for example, pressing the dial gauge against the appropriate part of the FAG bearing end face or shaft; investigating the way the reading changes with the preload load. The preload method has its helium aspect; for example Cheng moment of conflict increases, the temperature advances, days be shortened; so should all ponder; weigh the pros and cons; selection of the appropriate amount of preload.
(3) Bearing equipment FAG bearing equipment has a great influence on bearing rigidity; generally speaking; ball thrust and ball bearings with centripetal thrust type; when used in pairs, it is advisable to adopt the outer ring large end face relative (ie its The pressure line constitutes the pressure cone tip outward; the ability to equip the bearing against the overturning moment is large; the amount of preload that is adjusted when the temperature changes is less changed.
(4) Select multiple FAG bearing support methods under the condition of axial orientation; use two or more bearings for each support as radial support; can improve the support rigidity. For example, it is widely used in machine tool spindle components; 3. The axial preloading device is selected; several sets of radial thrust bearings are used as the shaft support of the same fulcrum.
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