Fluid-Structure Interaction Analysis on the Static Characteristics of Aerostatic Spindle of Ultra-Precision Machine Tool
|School||Harbin Institute of Technology|
|Course||Mechanical Manufacturing and Automation|
|Keywords||Gas hydrostatic bearing Static characteristics Fluid-structure interaction|
Ultra-precision single point diamond turning KDP crystal of large-diameter high-precision processing technology, and excellent spindle dynamic and static performance is the core of the precision machining . Ultra-precision machine tool spindle generally use high-precision , high - stiffness aerostatic bearing , considering the interaction between structure and fluid at the design stage , accurate the gas hydrostatic bearing the static characteristics , not only for the design of the spindle system , but also for the dynamics analysis and design of the entire machine has an important significance . In this paper, KDP crystal ultra - precision machine tools for the study, First of all, according to the basic equations of fluid dynamics derived gas hydrostatic thrust bearing static characteristics theory formula , and the formula to calculate the thrust bearing stiffness in the working pressure . Then, the establishment of the the KDP crystal ultra - precision machine tools gas hydrostatic bearing fluid analysis and structural analysis of the finite element model and proposed the sequential coupling algorithm to achieve the hydrostatic bearing fluid-structure interaction analysis , calculation of the deformation of the spindle structure in working condition and ended of push plate elastic deformation of the static pressure thrust bearing stiffness . And , on this basis , the analysis of the influence of the number and diameter of the screw connection between the thrust plate and the spindle of the spindle structure of the elastic deformation , and provide direction for the optimization of the coupling structure . Again, different working pressure gas aerostatic spindle deformation and stiffness characteristics of the experimental study , and the theoretical formula to calculate the results of the finite element method and experimental results were compared and error analysis . Finally, the establishment the KDP crystal ultra - precision machine tools overall mechanical finite element model of the structure , the calculated gas hydrostatic thrust bearing stiffness characteristics of the spring element added to the overall model , static and dynamic analysis of the whole machine , check the strength of the structure , and analyze the the gas hydrostatic thrust bearing static characteristics of the dynamic characteristics of the whole machine .