Research On Flow Simulation And Mechanical Properties Of Hydrostatic Guide-way

The properties of precision CNC machine tool reflects a countrys strength of science and the level of development of equipment manufacturing industry,have been paid more attention by each national industry.The precision of CNC machine tool feed system is widely adopted by hydrostatic guide-way as supporting parts,its static and dynamic characteristics is the key to ensure the accuracy of relative motion between the moving parts of the whole machine performance.Therefore this topic use the closed constant flow hydrostatic guide-way as the research object,through establish of static and dynamic mathematical model and flow field simulation analysis.Research on the influence of design parameters on the performance of the guide rail,to provide a theoretical basis for the design and optimization of guide rail.According to the work of hydrostatic guide-way.established fluid control equations of hydrostatic guide rail oil seal edge by the dimensional analysis,To compared the magnitude of fluid filed force,such as viscous,inertial and body force,illustrate the viscous force plays a leading role.To provide a theoretical basis for the guide-way’s performance analysis and Simulation of flow field in subsequent.By using the finite difference method and MATLAB program to solve the control equation of oil film,the numerical expression of the static performance of rail is obtained.The research indicates that the design of oil film thickness has greatest influence on the static performance of rail,to increase the design gap,the bearing capacity and the static stiffness will be exponential decline.Established motion mathematical and deduced the slide dynamic equation,the dynamic stiffness and damping has got.Study on the dynamic performance of rail in step load.Studies have shown that guide rail’s rise time increased with the increase of initial film thickness and oil viscosity when it is subjected to a step load;while the rail dynamic stiffness decreases first and then increases with the increase of load frequency,with the increase of film thickness,its dynamic stiffness decreases first and then increases.Adopt CFD software FLUENT to simulate the internal flow characteristics of rail oil chamber.Through the numerical simulation to got oil chamber internal flow field distribution and pressure distribution.Research shows that the H-shaped oil recess and rectangular oil recess in the same capacity.The guide-way would produce dynamic pressure defect when it was motion at overturning moment,and then the rail capacity fluctuation,influence the precision of the track.The transverse oil slot can reduce dynamic pressure effect,and improve the accuracy of the track.