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1 International Journal of Applied Mechanics and Engineering

1 2003

1 Hagiu G.

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Reliable high speed spindles by optimum bearings preload

100%

Hagiu G.

2003

tom Vol. 8, no 1

57-70

To design a high speed spindle with enhanced qualitative performances - high accuracy and service life together with a stable dynamic and thermal regime - two main conditions have to be secured: an optimum internal load distribution on the bearings and an efficient and safe lubrication regime. The preload force, by the significant changes produced on the bearings functioning parameters, i.e., kinematics, both load internal distribution and amount, appears as one of the most important factors affecting the main reliability parameters of high speed spindles. A theoretical research assisted by an experimental validation on grinding machine spindles was developed to determine the bearings preload influence on the spindles main reliability parameters, i.e., service life, dynamic and thermal stability. From the analysis of the results obtained, the optimum bearings preloads able to secure, in given operating conditions, the imposed reliability parameters for the high speed spindles were determined.