Detailed analysis: "high-speed bearing" device equipment and adjustment

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Detailed analysis: "high-speed bearing" device equipment and adjustment

Source: China Bearing Network Time: 2013-05-05

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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 change and hardness change from normal temperature to high temperature,
.2) Force system changes and shape changes caused by centrifugal force at high speed.
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.
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 under the condition 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 relative misalignment of the inner and outer rings along the axial direction. The clearance of the ball bearing.
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 of the seat hole or journal; while considering the time of these problems; it is necessary to pay attention to the high-speed elements and high-temperature elements of the bearing operation.
3. The development example of ultra-high speed bearings is based on the development of ultra-high speed HA tapered roller bearings.
.1) The problem is raised in gas turbines and some machine tools and engineering machinery; high speed and axial load are large; the application of ball bearings is too short; the use of short cylindrical roller bearings is lack of axial load; axial clearance Difficult to adjust; expect to use tapered roller bearings to break this problem.
.2) Skills to be dealt with. The skill of high-speed restraint of tapered roller bearings is to improve the smoothness between the large ribs of the inner ring and the large end faces of the rollers; this part is most prone to severe wear and burn at high speed; The main reason for constraining its speed.
.3) Treatment method In the general layout of tapered roller bearings; smooth oil flow path is difficult to obtain smooth oil on the inner ring large rib and the large end face of the roller; this part is relatively large sliding; it is the most demanding smooth oil.
.4) Achievable effect The HA-type bearing has a dmn value of up to 2 million; twice the advancement of the general layout; for example, for bearings of a gas turbine reducer spindle (model I-IA30205); Under the condition of 1000N load; ensure that there is 2L/min oil supply to the bearing to supply circulating No. 4 turbine oil; its working speed can reach 60,000 revolutions without causing burns.
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