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Trace grease smooth analysis of high speed spindle bearings
Source: China Bearing Network Time: 2013-06-12
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In addition; the trace grease is smooth without the need for metering and monitoring equipment or fine oil supply pipes and other accessories; oil mist does not occur; this makes it superior to oil mist smooth and smooth spray; not only low cost; and simple protection; especially Its sleek system does not occupy much space and weight; this is undoubtedly a great attraction for aviation machinery.
Smooth compared with trace oil; trace grease has low transpiration speed; less leakage; higher load bearing capacity; better damping effect; lower operating temperature and stability; conflicting torque is also stable; together can seal and avoid liquid and Solid dirt enters the bearing; there are fewer problems; therefore, the machine tool spindle with smooth grease is used; it can work for more than five years without protection; even for ten years. And; because of low heat generation; simply adhere to the spindle system Precision.
A soap-based smoothing grease with a low-viscosity oil as a base oil; it is commonly used to carry out a trace of grease smoothness; the fat has a mesh-like arrangement in which interlaced fibers are formed; it functions as an oil storage tank; and its oil storage method and porous Sintered metal bearings are very similar; the smooth oil is supplied to the bearing by capillary action; the thickness of the smooth film formed reaches a stable value; it is no longer added with the addition of the rotational speed; therefore, the conflicting torque is stable.
In order to ensure the successful completion of trace grease smoothness under high speed conditions; it is necessary to control the three steps of clearing, filling smooth grease and running.
Before the application of smoothness, the components of the bearing need to be cleaned and completely boring; any remaining original smooth oil, smooth grease or rust inhibitor must be completely removed with volatile solvent.
The filling amount of smooth grease is determined according to the bearing layout, working speed, oil storage space and the function of sealing and dustproof; it is necessary to ensure that the oil film thickness of the touch surface is satisfied; to avoid direct touch of metal and metal; Supply ample liquid smooth. Smooth grease itself is also necessary to be extremely pure.
Running is the most important part of the three links; it is necessary to start from the low speed; when the temperature reaches the stable condition, the speed is gradually improved; until the temperature has an agile rise, the running is stopped; after the bearing system is cooled to room temperature Run from the beginning with the running speed before the suspension; so repeat the running; until the spindle is working at the working speed; the heat balance temperature reaching 35 ~ 40 °C stops.
If there is no temperature monitor; the running speed should be controlled below the maximum operating speed; the speed increment is 10r/min for each running; the speed is continued for 15min each time; then it is cooled to room temperature; .
If the bearing speed can not be changed; the spindle can be operated at the working speed for 15min; then the parking is cooled to the room temperature; the running is repeated; until the above heat balance temperature is reached.
After the success of the running; under the condition of the maximum operating speed of the spindle; the temperature rise of the bearing system will be lower than 10 ° C. In order to control the temperature rise in such a small scale; the retaining ring of the self-regulating bearing clearance is required; or Appropriately select the shape and scale of the roll; make it touch the raceway without any additional stress after the heat is swollen.
During the running time; excessive smooth grease is forced into the cavity of the bearing housing; only a small amount of smooth grease required for trace smoothness is left in the touch area of ​​the bearing; other touches are external; for example, ribs, pockets, etc. Smooth oil film; after running, it has also been adjusted accordingly.
Trace grease is used in conjunction with the cooling method; there is a rotational speed scale that can be used to improve the smoothness of trace fat.
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