Research On High Speed And Heavy Load Effect Of Hydrostatic Thrust Bearing

With rapid development of advanced manufacturing technology,especially the emergence of high-speed cutting technology,spindle speed and load requirements are higher and higher.Along with rotational speed increase,film becomes thinner for larger stress heating.There is also uneven deformation.Hydrostatic friction pairs will be with the local boundary lubrication or dry friction and suffers from tribological failure in serious time.Thus,it is necessary to improve worktable rotating speed and bearing capacity of hydrostatic thrust bearing.Rotational speed and load of worktable have significant effect on lubrication performance of hydrostatic bearing,and the two factors intercouples.Thus,it is a key to explore matching relation between rotation speed and bearing for super heavy hydrostatic bearing performance research.According to this problem,double rectangular recess hydrostatic bearing was taken as the research object.Based on tribology and lubrication theory,the pressure field,temperature field and velocity field of oil film were simulated by the CFD software of ICEM CFD and CFX under the condition of viscosity and various viscosity.The influence law of rotational speed and load on pressure field,temperature field and velocity field of oil film was presented.In order to verify the validity of theoretical analysis and numerical simulation,the relationship experiment between temperature test and speed-load was designed and carried out on a 5 meter vertical NC lathe in Qiqihar Heavy CNC Co.Ltd..The limit speed of different rotational speed and different loads was measured under the condition of the maximum bearing capacity.Compared experiment with theoretical calculation and numerical simulation,the datum has good consistency.The results verify the correctness of theory research and simulation.It is of great significance to study film performance and worktable characteristics.