Detailed discussion on the application of "high rigidity bearing"

Source: China Bearing Network Time: 2018-02-08

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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) use bearing application technology to improve support rigidity, (3) properly adjust host layout parameters; to improve 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) the bearing with a large scale; its rigidity is higher than the bearing with a small scale; even It is the same diameter; the bearing with larger width; its rigidity is smaller than the width, (3) the number of rolling elements and the number of bearings and the number of columns; its rigidity is good, (4) the bearing with adjustable clearance Conducive to the improvement of the support rigidity i (5) if necessary; can choose bearings without inner ring, without outer ring or without inner and outer ring; then reduce the deformation link and add the number of rolling elements.
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.
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.
(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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