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

The hydrostatic thrust bearing is a key component of a large vertical CNC lathe,and its performance directly affects the processing efficiency,machining accuracy and stability of the vertical CNC lathe.In order to improve the quality of processed products,the optimization of hydrostatic thrust bearings has beco me particularly important.In the actual application of hydrostatic thrust bearings,the shape of the oil cavity is different,and the key parameters such as the depth of the oil cavity and the size of the oil inlet hole of different cavity types have not been optimized.There is a lack of comparison of various cavities under the same working conditions.Therefore,this article explores the effect of the optimal cavity depth and the optimal oil hole size of the double rectangular cavity,toroidal cavity,circular cavity,and racetrack-shaped cavity on the hydrostatic thrust bearing under the extreme working conditions of 24 t load and 104 rpm speed.This article explores the oil cavity depth and oil inlet size of the double rectangular cavity,circular ring cavity,circular cavity and racetrack-shaped cavity.In the process of exploration,the methods of theoretical analysis,simulation and experimental verification are used for research.Firstly,the development status of hydrostatic thrust bearings at home and abroad is summarized,and the cavity type research of hydrostatic thrust bearings is summarized and analyzed.Secondly,according to the characteristics of different cavity types,the flow equation and bearing capacity equation of different cavity types are derived.The related equations of oil film thickness-speed and the related equations of oil film thickness-load are derived.These theoretical equations provide a theoretical basis for simulating the reliability of different cavity types.And then,the Solidworks software is used to establish oil film models of different cavity types according to the theoretical calculation results.When the modeling is completed,this paper uses the ICEM CFD module in ANSYS to perform structured meshing of different oil film models.By defining related Part,it is convenient for the subsequent solution calculation.When setting the boundary conditions,this paper uses the CFX module in ANSYS to operate to obtain the pressure field cloud diagram and temperature field cloud diagram of different cavity depths and different oil inlet hole sizes.According to the pressure field cloud map and the temperature cloud map,this paper proposes the best cavity depth and the best oil inlet hole size for the high load-bearing low temperature rise of each cavity type oil film.The best cavity types are compared,and the comparison results provide references for the actual selection and optimization of cavity types in engineering.In this paper,the new Q1-224 hydrostatic thrust bearing test bench is used to conduct experiments on the optimal cavity type of the double rectangular cavity under the extreme working conditions of 24 t load and 104 rpm speed.The collected experiments on the temperature field and pressure field of the optimal cavity of the double rectangular cavity are summarized.This method verifies the correctness of different cavity type oil film theoretical models and different cavity type simulation methods.