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Application of high rigidity bearings
Source: China Bearing Network Time: 2013-06-20
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First, the method of improving the rigidity of the shaft support to improve the rigidity of the shaft support; in principle, it can be summarized as follows:
(1) Select high-rigidity bearings,
(2) Using the bearing application technology to improve the support rigidity,
(3) Properly adjust the host layout parameters; in order to improve the support rigidity.
Second, the choice of bearing from the concept of bearing rigidity from the concept of bearing rigidity to select the bearing is (1) the rigidity of the roller bearing is higher than the ball bearing,
(2) Bearings with large dimensions; their rigidity is higher than that of bearings with small dimensions; even if the diameter is the same; the bearing with larger width is higher in rigidity than the smaller one.
(3) Bearings with multiple number of rhombic bearings and many columns; the rigidity is good,
(4) Adjustable clearance bearing; beneficial to improve support rigidity i
(5) Under the necessary conditions; bearings without inner ring, without outer ring or without inner and outer rings are available; then the deformation is reduced and the number of rolling bodies is added.
Third, the use of improved shaft support rigidity technology to use technology to improve the rigidity of the shaft support; the description is as follows:
(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 orientation accuracy; the higher the support rigidity is.
For the above-mentioned external appearance, the surface is strengthened and treated; it is advantageous to improve the rigidity. The high-hardness plug with low roughness is used; the punch is repeatedly pressed in and out of the seat hole under a smooth condition with a certain interference; it is also beneficial to improve the support rigidity. If necessary, the collar can be similarly treated with a snap ring.
(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 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 the deformation-load has a linear relationship; the preloading load is immediately discontinued; a stable stiffness is obtained at this moment.
Afterwards; there is a fixed relationship between the axial stiffness of the bearing and the radial stiffness; it does not depend on the applied load.
The above-mentioned deformation amount can be measured; for example, the dial gauge head can be pressed against the bearing end face or the appropriate part of the shaft; and the method of changing the reading with the preload load can be investigated.
The pre-tightening method has its suffocating aspects; for example, increasing the conflicting moment of the bearing, increasing the temperature rise, shortening the lifespan, etc.; therefore, all thinking; weighing the gains and losses; selecting the appropriate pre-tightening amount.
(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; With the axial pretensioning device; several sets of radial thrust bearings as the shaft support of the same fulcrum.
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