Actively lubricated hybrid journal bearings based on magnetic fluids for high-precision spindles of machine tools

Luis Norberto Lopez de Lacalle , Harkaitz Urreta (1) , Gorka Aguirre (2) , Pavel Kuzhir (3) , Luis Norberto López de Lacalle (4)

1 IK4-Ideko
2 IK4-Ideko
3 INPHYNI - Institut de Physique de Nice
4 UPV - Universidad del País Vasco

The research work reported in this paper is focused on the use of magnetic fluids as active lubricant for improving the performance of hybrid journal bearings, with application to high precision machine tools. Prototype design was optimized following numerical computation of Reynolds equation and computational fluid dynamics (CFD) calculations, in both cases with Herschel-Buckley model for the magnetorheological fluid. This fluid (LORD Corp. MRF 122-2ED) was experimentally characterized in detail. The improvement of the hydrodynamic effect in journal bearings was demonstrated with 50% higher load capacity and stiffness, mainly at half of shaft eccentricity 0.4<ε<0.7. Active hydrostatic lubrication achieved quasi-infinite stiffness

Domaines: Mécanique [physics.med-ph]; Génie mécanique [physics.class-ph]; Vibrations [physics.class-ph]

Luis Norberto Lopez de Lacalle, Harkaitz Urreta, Gorka Aguirre, Pavel Kuzhir, Luis Norberto López de Lacalle. Actively lubricated hybrid journal bearings based on magnetic fluids for high-precision spindles of machine tools. Journal of Intelligent Material Systems and Structures, 2019, 30 (15), pp.2257-2271. ⟨10.1177/1045389X19862358⟩. ⟨hal-02426104⟩