The Optimization Design And Performance Research Of The Hydrostatic Bearing Of The Grinding Wheel Spindle Of The High Hydrostatic Pressure Centerless Grinder

With the continuous development of science and technology,it is necessary to manufacture equipment with higher manufacturing accuracy and production efficiency,Moreover,the requirements for the completion of manufacturing tasks and the technical maturity of mass production product line are higher.High hydrostatic centerless grinder is a typical mechatronic and hydraulic equipment.At present,the production and processing technology of the spindle support system used in the domestic centerless grinder is relatively mature,but the grinding accuracy is low and the stability is poor.The machining accuracy and rigidity of the spindle support system of the domestic high hydrostatic centerless grinder are determined by the performance of the hydrostatic bearing.The thermal deformation of the bearing will damage the machining accuracy of the machine tool,and the high temperature will cause the degeneration of the lubricating oil in the bearing,which will affect the working accuracy and accuracy stability of the bearing.Therefore,it is necessary to optimize the design of the grinding wheel spindle hydrostatic bearing.First of all,it is necessary to reveal the structure of the bearing and calculate the parameters of the bearing.On this basis,the bearing is redesigned,and the oil film lubrication performance of the bearing is studied starting from the lubrication theory.Then,it carries on the finite element modeling and uses fluent and ANSYS to carry on the performance analysis.The comparison between the designed bearing and the original bearing is carried out,and the variation rules of pressure field,temperature field and thermal performance of the bearing under different oil cavity structure,different rotating speed and different oil supply pressure are analyzed by simulation.Then,on this basis,the improved particle swarm optimization algorithm is used to optimize the bearing,The results show that the main performance parameters of the bearing have been effectively improved.Through optimization,the comprehensive performance of the bearing has also been significantly improved.In addition,through the study of the modification of bearing surface materials to further improve the comprehensive performance of the bearing,the DCL coating with hydrogen content of 20at% and 40at% was studied respectively,and the coating was regulated by nano diamond and graphene zero dimensional and two-dimensional composite materials.Inorder to develop a more adaptable and robust solid carbon film to meet the workingrequirements of bearings under more complex working conditions,the in-situ growth and lubrication mechanism of nanostructured transfer film was studied by in-situ stripping technology to prepare nanostructured samples.The a-C:H film binding characteristics of nanostructured lubricants and the role of tribologically induced structural evolution in the formation of transfer film were discussed.Finally,the bearing after optimization and modification is further analyzed.The comparative analysis before and after optimization and improvement shows that the comprehensive performance of the bearing has been significantly improved to meet the relevant requirements.