| In recent years,Our country’s manufacturing industry is booming,and the level of processing and manufacturing is increasing.Ultra-precision machining plays a very important role.As the carrier of precision manufacturing,ultra-precision machining machine has been the hot research object in the field of ultra-precision machining.In order to get better machining accuracy,hydrostatic air flotation support technology has been widely used in the production of ultra-precision machine tools Under construction.Aerostatic support has a very prominent advantage in the ultra-precision machining application technology.With aerostatic gas as the support medium,it has a good performance in friction,precision and power consumption and other aspects of precision machining.Although it is the same static pressure gas medium,its support performance is different due to the influence of gas pressure,throttling form and gas film thickness.It is mainly used in the support platform of clamping workpiece or tool.In this paper,a small orifice throttling b-axis aerostatic turntable is designed and studied,mainly focusing on the design of turntable support system and the research of static and dynamic characteristics of turntable.Starting from the overall design of turntable,the basic framework of turntable design is established.Starting from the basic dimensions of turntable design,through reading the literature,the basic rules of aerostatic support system dimensions design are mastered.According to the overall requirements of lathe design,the overall dimensions of turntable are preliminarily designed,and the basic parameters of aerostatic bearing in thrust and radial directions are calculated Finally,the calculation data are obtained to verify the rationality of the preliminary dimension design of the turntable.Based on the ANSYS software,the static air film structure of the support system is simulated,and the simulation results are compared with the engineering calculation results.The factors that affect the performance parameters of the support system are studied,and the basic rules of the influence factors on the performance parameters of the air bearing are obtained.The dynamic characteristics of the turntable are simulated and analyzed.Through modal analysis and harmonic response analysis,the basic dynamic characteristics of the turntable system are obtained.Finally,the turntable is debugged and experimental research is carried out.An experimental platform is built to measure the natural frequency and rotation accuracy of the turntable,which verifies the reliability of simulation calculation and the rationality of turntable design. |
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