Deformation prediction and experimental investigation of friction pairs in hydrostatic support turntable
摘要
The hydrostatic support turntable deforms due to the shear and extrusion of oil film during operation, which affects the machining accuracy. The deformation of hydrostatic support turntable is investigated by fluid-thermal-solid interaction approach considering the viscosity-temperature effect. The oil film characteristics of hydrostatic bearings with variable viscosity are investigated, and the thermal and elastic deformations of the friction pair are simulated. The effects of rotational speed on the deformation and oil film were studied and analyzed. The results indicate that the deformation of the workbench and the oil film temperature increase with the increase in rotational speed. The thermal deformation caused by temperature rise is larger than the elastic deformation caused by pressure. In addition, numerical studies reveal that the deformation direction of the workbench is downward to the direction of the base, which leads to the thinning of the oil film, thus affecting the fluidity of the oil in the cavity.