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Application of high rigidity SKF bearings
Source: China Bearing Network Time: 2018-02-02
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(1) Select high rigidity skf 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 to select bearings from the concept of bearing rigidity is:
(1) The rigidity of the roller bearing is higher than that of 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 skf bearing with larger width; its rigidity is higher than the width,
(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 can be selected; thus reducing deformation and adding roll number.
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 skf bearing-like appearance, 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 with a certain interference; and 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, under the condition that the rotational speed is not too high; the temperature rise and fall are not large; the best should also be adjusted to a small negative clearance condition.
When preloading is applied; it is necessary to continuously measure its deformation state; note that during the low value of deformation; the deformation is linear with the addition of the preloading load, while during the high value; the deformation is linear with the addition of the load. The deformation-load has a linear relationship; the preloading load is immediately suspended; a stable stiffness can be 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, improving the temperature rise, shortening the life, etc.; therefore, all thinking; weighing the gains and losses; selecting the appropriate pre-tightening amount.
(3) The equipment of the skf bearing equipped with bearings has a great influence on the rigidity of the skf bearing; generally speaking; the ball bearing and the roller bearing of the centripetal thrust type; when used in pairs, the outer end of the outer ring should be adopted (ie The pressure is formed by the pressure cone tip outward; the ability to equip the skf bearing against the overturning moment is large; when the temperature changes, the pre-tightening amount 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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