| With the rapid development of modern machinery manufacturing technology,aviation,aerospace,ships and other industrial productions have higher and higher requirements for ultra-precision processing parts.As the core functional component of some lathes and large gear processing equipment,the performance of the static pressure support workbench has a great impact on the overall performance of the whole CNC machining equipment.If the operating time of the workbench is too long,it will cause deformation of the turntable,so that the oil film shape of the static pressure support workbench will change,which is easy to cause the oil film to break and form dry friction,which will adversely affect the operation stability and the surface quality and size of the processing workpiece.Therefore,the study of the deformation of the static support table has become an urgent problem to be solved in the field of heavy CNC machining technology.This paper aims at the vertical static support workbench of Qizhong CNC Equipment Co.,Ltd.as the research object.On this basis,it comprehensively considers the oil film temperature,pressure and friction pair coupling deformation of the turntable,and proposes a modular method to reduce the deformation of the workbench,which provides a theoretical basis for the design of the static support table.For this purpose,this paper has done the following research work for the hydrostatic bearing workbench:(1)Based on hydrodynamics and static pressure theory,the oil film flow equation,bearing force equation and temperature rise equation of the double rectangular cavity static pressure support workbench are established,and a three-dimensional model of the double rectangular cavity static pressure support workbench is established using SOLIDWORKS modeling software.(2)The gap oil film of the double rectangular cavity static pressure support table is divided by ANSYS ICEM CFD software,the boundary conditions of the oil film are simulated and analyzed in ANSYS CFX,and finally the oil film pressure field and temperature field of the double rectangular cavity at different rotational speeds are obtained.Establish the three-dimensional modeling of the static pressure bearing bench,couple the pressure field and temperature field to the friction pair as body load,and solve the grid division in WORKBENCH,so as to obtain the thermodynamic coupling deformation and explore the law of thermodynamic coupling deformation.(4)Take the 8t-100r/min static pressure support workbench as the research object under common working conditions,extract the friction pair deformation and fit the curve of the static pressure support workbench,trim the rail surface of the workbench,establish a modified static pressure support workbench model,obtain the pressure field and temperature field of the gap oil film after the repair,and then import the WORKBENCH simulation software again for thermally coupled deformation simulation,and compare and analyze it with the deformation amount before the revision.(5)Carry out experimental research on the modified double rectangular cavity static pressure support workbench,obtain the experimental data of oil film temperature field,pressure field and oil film thickness,and compare and analyze it with the simulation results to verify the correctness and modified effect of the simulation method. |
