How to deal with overheating of thrust ball bearings?
When the workpiece of the outer spherical thrust ball bearing is severely overheated, the grain size will become coarse, and the amount of iron wire in the steel will also increase, which will easily cause the thermal processing performance of the workpiece to deteriorate. When stainless steel companion parts or flange parts are overheated, orange peel-like surface defects are likely to occur. For large workpieces with overheated structures, forging can be used to refine the grains to eliminate defects, prevent orange peel-like surface defects in the workpiece during cold deformation, and improve the surface quality of the workpiece.
You can check the motor thrust ball bearing to see if there is insufficient clearance in the motor thrust ball bearing (wrong fit selection), causing the inner ring side to expand excessively, causing the thrust ball bearing to overheat; the thrust ball bearing is too tight inside and the adapter sleeve is too tight. It can also cause overheating of thrust ball bearings; sealing installation errors can cause friction with stationary parts; preloaded thrust ball bearings can also cause overheating if they are installed opposite each other; overheating can also be caused if the R-axis is not straight or the outer ring is running; the shaft size is too large or the axle box Hole size that is too small can also cause overheating.
It is generally believed that if the thrust ball bearing is installed with one end fixed and one end swimming, the additional axial load can be eliminated. Analysis and calculation can be carried out according to the pure radial load of the thrust ball bearing. In fact, when the fan main shaft expands and contracts in the axial dimension due to temperature changes or other reasons impose an axial load on the thrust ball bearing, only when this load reaches a certain value will the thrust ball bearing at the free end move. , so that the load does not continue to increase. That is to say, the axial load cannot be completely eliminated by the movement of the thrust ball bearing. Although this value is not large (its size is related to the fit of the thrust ball bearing outer ring and the thrust ball bearing seat), it can be ignored for some types of thrust ball bearings. However, for double-row spherical roller thrust ball bearings and double-row spherical ball thrust ball bearings, when the lubrication conditions and rotational speed remain unchanged, due to the existence of directional load, the two rows of rolling elements are unevenly loaded. The contact stress between the row of rolling elements under greater load and the raceway increases, which increases the effect of friction and increases the heat generated during the operation of the thrust ball bearing. In addition, the existence of axial force will also increase the number of loaded rolling elements on one side, increase the friction points between the rolling elements and the raceway, and also increase the heat generated during the operation of the thrust ball bearing. Mainly due to these two reasons, the temperature rise of the thrust ball bearing is too high. In this case, if you want to control the temperature rise of the above-mentioned thrust ball bearing within the specified range, you must try to improve the lubrication conditions or reduce the speed of the thrust ball bearing.
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