Bearing Selection of the three major factors must be considered
Bearing Selection of the three major factors must be considered is the speed limit, required service life and is expected to absorb the workload, which is bearing the selected three performance requirements must be met.
Speed limit is the maximum allowable bearing rotation speed exceeds this limit, the bearing operating temperature will continue to rise, dry lubricant, so bearing stuck, so speed limits of the selected bearing bearings intended to take more than the maximum working speed than 10% is appropriate. Bearing type not selected in the circumstances, desirable location in the scheduled installation of bearings, shaft and seat hole diameter and the calculation of the average diameter of the bearing half-dm, dm times the intended maximum operating speed bearings n, dmn value from 10 / should not exceed 9 times the speed limit of the selected bearing.
But the bearing speed limit is not static, but is directly related to lubrication. For example, set out to take samples of oil lubricated bearings under the condition of bearing speed limit n0, the same bearing grease lubrication conditions in the limiting speed 0.8n0, under the conditions in the oil mist lubrication was 11.5n0; in the fixed volume of non-repeating cycle oil lubricated conditions, continuous work for a small tank for the 0.85n0, and intermittent work for large tank was 0.95n0. And n0 is the numerical equivalent Lubrication and cooling equipment with a filter din of recirculation oil lubrication, pay attention not to take such a manner or effect of lubricating the same way other lubrication, bearing samples can not take the n0 limit value as the actual speed bearings , but should be based on the specific lubrication means, according to the above example will n0 multiplied by a constant of proportionality, as the bearing value obtained from the actual speed limit; Secondly, although bearing the actual speed limit be increased through improved lubrication, but to consider to pay for improving the lubrication of equipment costs and maintenance costs, and lubrication equipment occupies the space and other factors, consolidated balance sheet will make the best choice.
In fact considering the bearing speed limit, not only to take into account the type of bearings, and sometimes must take into account the composition of bearing components, such as cage material, form factor design and technology and India, also bearing Neibu of sliding friction, lubrication agent storage and maintenance of rolling stability of operation is closely related to bearings can sometimes be the key to limit speed requirements on bearing life and reliability are unified into account, usually taking the reliability coefficient of 90% This means that a lot of work on the same bearing operating conditions, 90% of the bearings in the working life of L10 at the scheduled time remains normal. If you want more reliable, say 96%, the request must be reduced bearing life, such as L10 life must be reduced to L4.
Overall, the spindle bearings, the highest demand is and the whole machine has the same or slightly higher life, the minimum requirement is part of the overhaul life of longer than main axis, and in fact, use more meets performance requirements of the host spindle system without causing too large and financially more cost-effective comprehensive consideration of the program, for most machines, the precedent has been very successful for reference.
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