Relevance Information Analysis and Extraction Between Performance and Influence Factors of Porous Aerostatic Spherical Bearing of CNC Machine Tool Motorized Spindle

Abstract

AbstractIn order to solve problems of excessive heat generation and severe wear of CNC machine tool motorized spindle support and extract relevance law for multi-source heterogeneous information analysis and performance improvement of spindle, porous aerostatic spherical bearing is chosen as the research object. The flow field characteristics of porous stator and gas film are analyzed by CFD theory. The relevance information of supply pressure, permeability and thickness of porous material with bearing radial performance is analyzed and extracted. It is found that bearing capacity of the porous aerostatic spherical bearing is provided by film pressure difference caused by rotor eccentricity and dynamic pressure effect; There is an optimal permeability range of porous material for bearing performance; The bearing capacity and stiffness are high in the range and low out of the range; The larger thickness of porous stator is, the higher radial bearing capacity and stiffness are, but the effect is not obvious with thickness too large; The bearing capacity and stiffness of porous aerostatic spherical bearing improve almost linearly with supply pressure rising. Analysis and extraction of the relevance information between the performance and influence factors of porous aerostatic spherical bearing is of great significance to multi-source heterogeneous information analysis and research of high-speed spindle.KeywordsCNC machine toolMotorized spindlePorous bearingBearing performanceRelevance information