Installation and Adjustment of High Speed Bearing

Installation and adjustment of high-speed bearings:
    1. High-speed bearing with the clearance and high-speed bearings due to high-precision bearing requirements, but also by high-temperature bearing requirements, so consider its coordination and clearance, to take into account the following two points:
    (1) from the normal temperature rose to high temperature changes in the size and hardness changes;
    (2) high-speed centrifugal force caused by changes in the force and shape changes.
    In short, in the high-speed, high temperature conditions, from the match and the choice of clearance to strive to maintain the accuracy and performance of the bearing, which is difficult.
    In order to ensure that the bearing after the installation of the raceway deformation is small, the interference with the interference can not get too much, while the high-speed centrifugal force and high temperature thermal expansion, or offset the normal pressure with the surface. Or the mating surface is relaxed, so the amount of interference must be considered in consideration of the above two factors under the premise of careful calculation, at room temperature constant effective interference for high-speed bearings may be invalid.
    If the calculation of this contradiction is too large (usually only in the ultra-high speed under this situation), only to take under the ring lubrication and static lubrication and double lubrication measures, and this program may make the bearing dmn value breakthrough 3 million mark.
    In considering high-speed bearing clearance not only to consider the above factors, but also to consider the thermal expansion of the shaft on the impact of the clearance, requiring the bearing in the working state, that is, the best temperature at the working temperature, and this Kind of clearance is included, the outer ring ball center of the exact state of the formation of the ball. As the high-speed bearings to reduce the relative sliding and internal friction, it is best not to use the inner and outer ring along the axial relative dislocation of the way to adjust the ball bearing clearance.
    In considering the bearing with the amount of interference and clearance, we should pay attention to the material at high temperatures become soft and easy to deformation characteristics, and many times from the normal temperature to high temperature temperature changes caused by a certain permanent deformation of the possibility.
    2. Requirements for host-related parts
    High-speed bearings require the bearing where the rotary system has undergone precise balancing, and the shaft and seat mounting parts should have higher dimensional accuracy and shape accuracy than the general requirements, especially the coaxiality and shoulder-to-seat or journal Vertical, and in considering these issues, the same must pay attention to the bearing when the high-speed factors and high temperature factors.
    The shaft support system requires both high rigidity and quality as much as possible. To overcome this contradiction, measures such as reduced surface roughness and surface strengthening can be used to improve bearing stiffness, using hollow shafts to reduce system quality.