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Analysis: Equipment cooperation and adjustment methods for high-speed bearings
Source: China Bearing Network Time: 2014-04-29
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1. High-speed bearing cooperation and clearance Because high-speed bearings need to be in accordance with high-precision bearing requirements; and high-temperature bearing requirements; so when considering their cooperation and clearance; take into account the following two points:
(1) Scale changes and hardness changes from normal temperature to high temperature,
(2) Force changes and shape changes caused by centrifugal force at high speed.
In the high-speed, high-temperature conditions; from the cooperation and clearance selection to strive to adhere to the bearing precision and work function; this is difficult.
In order to ensure the deformation of the raceway behind the bearing device, the tomb is ridiculously ridiculously 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 蛘 蛘 蛘 蛘 蛘 蛘 蛘The cooperation is lax; therefore, the excess is necessary to be carefully accounted for on the premise of thinking about the above two factors; the useful interference at normal temperature and normal speed may be invalid for high-speed bearings.
If the result of the calculation is too large (usually as long as it is under ultra-high speed); as long as the two-layer smooth method of the under-smooth smoothing method and the static-pressure smoothing method is adopted; and such a plan may make the dmn value of the bearing Break the 3 million mark.
Thermal expansion at high temperatures; or offsetting the normal pressure of the cooperative appearance. Or loosening the cooperation; therefore, the interference must be carefully calculated under the premise of thinking about the above two factors; useful at normal temperature and normal speed. Interference is probably not valid for high speed bearings.
If the result of the calculation is too large (usually as long as it is under ultra-high speed); as long as the two-layer smooth method of the under-smooth smoothing method and the static-pressure smoothing method is adopted; and such a plan may make the dmn value of the bearing Break the 3 million mark.
In thinking about the high-speed bearing clearance, not only must consider the above factors; but also consider the influence of the thermal elongation of the shaft on the clearance; the bearing needs to be in the working condition; that is, the optimal clearance at the working temperature; The kind of play is formed in the state of accurate alignment between the inner and outer ring grooves. Because the high-speed bearing strives to reduce relative sliding and internal conflict; the best way is to adjust the inner and outer rings relative to each other in the axial direction. The clearance of the ball bearing.
When thinking about the cooperative interference and clearance of the bearing; pay attention to the characteristics that the data becomes soft and simple deformation at high temperature; and the temperature change from normal temperature to high temperature repeatedly leads to the possibility of permanent eternal deformation.
2. Demand for mainframe-related parts High-speed bearing requirements Bearing reversal system through fine dynamic balance; shaft and seat hole bearing parts should have higher than the usual requirements of dimensional accuracy and shape accuracy; especially coaxiality and shoulder Straightness to the seat hole or journal; while considering the time of these problems; it is necessary to pay attention to the high-speed and high-temperature elements of the bearing work.
The shaft support system requires both high rigidity and the required quality as light as possible; in order to overcome this opposition; it can adopt methods such as reducing the appearance roughness and improving the appearance reinforcement to improve the support stiffness; using hollow shafts to reduce the system quality.
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