Design Of Ultra-Precision Hydrostatic Guideway Test Bench And The Study Of Its Dynamic And Static Characteristics

As an important indicator to measure the level of national manufacturing,precision and ultra-precision machining technology has increasingly attracted the attention of various countries.Advanced countries with leading technology attach great importance to ultra-precision machining,and at the same time make great efforts in their technical fields to maintain high-speed and stable industrial manufacturing levels,and have achieved many results.The guide rail system is one of the most important coupling component of ultra-precision machine tools.The accuracy of guideways is closely related to the machining accuracy of ultra-precision machine tools.The accuracy of guideways is affected by materials,control systems,assembly,etc.So,it's very important to study the guideways in depth.According to the requirements of the subject,this paper first completed the structural design and overall layout of the X and Z two-axis linkage motion mechanism comprehensive test platform.The ultra-precision hydrostatic guideway rail structure of the test platform is designed.The optimized structural parameters of the guide rail and the guide rail stiffness and bearing capacity of the machine tool are calculated.The liquid resistance method is used to solve the performance parameters of the single oil chamber of the guide rail.A model is provided for the later research on the control system and static and dynamic characteristics of hydrostatic guide rails.Secondly,the selection of the motor,the driver,the controller and the grating ruler in the control system was completed,and the static pressure guide motion control system was built.The mathematical model of linear motor is established.The three-loop simulation experiment is carried out on the motion model of the linear motor servo control system by using Simulink software.The PID parameters are adjusted repeatedly to make the system stable.The control system is verified according to the obtained parameters and results.rationality.The simulation experiment of the control system provides a theoretical basis for the construction of the physical machine tool.Finally,the analytical model of hydrostatic guideway dynamic parameters is established based on the experimental platform.The modal analysis of the model is carried out by ANSYS software.Get the conclusion that the influence of damping on the modal frequency of the guide rail system can not be ignored.Then the transient response analysis of the rail system is carried out,and it is concluded that the frequency-variable stiffness damping characteristics weaken the suppression ability of the high-frequency vibration of the hydrostatic guide rail system.The study of dynamic and static pressure characteristics of hydrostatic guide rails provides theoretical guidance for the actual platform construction.