HYDROSTATIC LINEAR GUIDE DESIGN
DOI:
https://doi.org/10.18372/0370-2197.4(109).20764Keywords:
hydrostatic lubrication, hydrostatic pressure, hydrostatic pockets, precision guide, graniteAbstract
The geometric parameters of the hydrostatic pockets in the structural steel bearing elements have been calculated. A model has been developed for analyzing the distribution of hydrostatic pressure depending on the shape and arrangement of the hydrostatic pockets. The surface roughness values of the granite guideway have been established as a function of abrasive grit size. The straightness and perpendicularity of the load-carrying surface of the granite guideway have been measured. Preliminary values of pressure and film thickness for the linear hydrostatic bearing have been selected. The pressure distribution between the guideway and the moving surface has been investigated in ANSYS Fluent, taking into account the measured surface roughness and the geometric configuration of the granite guideway. Diagrams of the predicted static pressure, stiffness and load-carrying capacity of the hydrostatic linear bearing have been obtained as functions of the operating pump pressure and oil viscosity. The results are relevant for the integration of the design into precision machine tools and instruments due to the accessibility, cost-effectiveness, ease of manufacturing, and advantageous mechanical properties of granite compared to metallic analogues.
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