Abstract
An experimental study based on high-speed spindle tests with conventional and hybrid bearings was conducted to analyse the power losses and damage accumulation in hybrid bearings. Power losses and temperature rise of bearings with steel races and ceramic balls were analysed and compared with the performances achieved by conventional stell bearings. The paper presents results concerning the effects of material combination and service parameters on power dissipation and damage accumulation. It is shown that the physical and mechanical properties of ceramics, used for balls in hybrid bearings, can reduce the power losses up to 25% as compared with conventional bearings. A method has been developed to estimate bearing average contact temperatures that can be useful in designing bearing boxes and lubrication systems. This method can also be used to monitor the spindle behaviour.
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