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空气静压电主轴是数控机床的关键功能部件之一,主要围绕其动态特性进行分析研究。首先,针对空气静压电主轴结构及轴承结构进行分析。然后,基于空气静压电主轴的动力学建模,对其进行模态分析和谐响应分析。最后,针对空气静压电主轴进行动态测试实验,并对比仿真分析结果和实验测试结果。研究表明载荷的大小决定了空气静压轴承的偏心率,同时对电主轴前端的刚度起决定性作用。谐响应分析表明在主轴固有频率左右,空气静压电主轴前端的振动位移较大。
Air static pressure spindle is one of the key functions of CNC machine tools, mainly around its dynamic characteristics of the analysis. First of all, analyze the structure of air static pressure spindle and bearing structure. Then, based on the dynamic modeling of the aerostatic spindle, modal analysis and harmonic response analysis are carried out. Finally, the dynamic test of aerostatic spindle is carried out, and the results of simulation analysis and experimental test are compared. Studies have shown that the size of the load determines the eccentricity of the hydrostatic bearing, while the stiffness of the front end of the spindle plays a decisive role. Harmonic response analysis shows that at the natural frequency of the spindle, the vibration displacement of the front end of the air static piezoelectric spindle is larger.