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High-speed imported bearing device cooperation and detailed description of its play

Source: Bearing network time: 2013-05-21

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High-speed bearings require imported bearing position reversal system through fine dynamic balance; the shaft and seat hole bearing parts must have higher than the general requirements of dimensional accuracy and shape accuracy; especially the coaxiality and shoulder to the seat hole or shaft The straightness of the neck; however, in thinking about the above problems; it is necessary to pay attention to the high-speed elements and high-temperature elements in the bearing operation.
Because high-speed bearings not only have high-precision bearing requirements, but also high-temperature bearing requirements; so consider the following two points when considering the cooperation and clearance of high-speed bearings: (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.
The deformation of the raceway after the imported bearing device should not be too large; the interference of the interference cooperation can not be too large; the centrifugal force at high speed and the thermal expansion at high temperature; or the normal pressure of the cooperating surface. To make the cooperation loose; therefore, the interference must be closely accounted for under the premise of thinking about the above two factors. Because at normal temperature and normal speed; useful interference is probably invalid for high-speed bearings.
If the accounting result 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 the above temperature factors should be considered; but also the influence of the thermal elongation of the shaft on the clearance; the bearing needs to be in the working state; that is, the optimum clearance at the working temperature; This kind of clearance is formed in the state of accurate alignment between the inner and outer ring grooves. Wuxi imported bearing Danaman-Gao.
Because high-speed bearings strive to reduce relative sliding and internal conflicts; so it is best not to use the method of relative misalignment of the inner and outer rings in the axial direction to adjust the clearance of the ball bearing.
The demand is focused on: when thinking about the cooperative interference and clearance of the bearing; the bearing data has the characteristics of becoming soft and simple deformation at high temperature; and the repeated changes from normal temperature to high temperature cause the eternal deformation.
In general, under the conditions of high speed and high temperature, it is necessary to insist on the accuracy and working function of the bearing from the selection of cooperation and clearance.

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