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the article citations: time:2014-12-24 11:07:46
1. run speed increase, because the density of silicon nitride balls low means that centrifugal force decreases.
2. increase rigidity, because the elastic modulus of silicon nitride 50% larger than the bearing steel.
3. heat to reduce, because silicon nitride balls have the characteristics of small friction coefficient and good motion performance.
4, thermal stability is better, because the thermal expansion coefficient of silicon nitride is a third of the steel.
5. design flexibility is bigger, because silicon nitride material properties make bearing designers can change different parameters without considering the effects.
when applied to machine tools, these features make the productivity and machining accuracy was improved, make the product quality improved. traditionally used in high speed spindle bearing lubricating system in general to adopt oil or oil mist lubrication system, because the grease will degrade the performance of the whole steel bearing. on the other hand, the can safely use. for machine tool makers, cancel the oil - gas lubrication system can significantly reduce the cost.
used in the aircraft engine in is in development. air turbine engine under high speed operation, the bearing load, the centrifugal force of the ball often become the main factor that restricts the highest engine speed. mixed with low-density silicon nitride ball bearing provides the possibility of higher speed operation, combined with the bearing internal heat is less, can significantly reduce weight.
