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高速电主轴在高转速下,不同预紧方式的轴承组将产生相互影响。为精确预测并控制高速电主轴的轴承支撑刚度和系统临界转速,建立一种不同预紧机理的轴承刚度数值模型,对主轴系统进行有限元建模,耦合轴承组与转轴构成转轴-轴承模型。通过对整体模型迭代求解,获得主轴支撑系统的动态特性参数,进而对主轴系统动态特性进行研究,解决了高速电主轴支撑系统在高转速下的超静定协调问题。制定转轴-轴承系统动力学计算流程,对Siemens CAT40型高速电主轴进行建模,研究了电主轴在不同工况下主轴轴承支撑刚度的动态特性。理论计算和试验结果表明,与传统计算方法相比,所建超静定模型计算电主轴在高速运转时的动态特性具有更高精度。
High-speed spindle at high speed, different preload bearing groups will have an impact. In order to precisely predict and control the bearing stiffness and critical speed of high-speed spindle, a numerical model of bearing stiffness with different pretension mechanism is established. The spindle system is modeled by finite element method, and the coupling bearing set and spindle are composed of spindle-bearing model. By iteratively solving the whole model, the dynamic characteristic parameters of the spindle support system are obtained, and the dynamic characteristics of the spindle system are studied. The problem that the high-speed spindle support system co-operates at high rotational speed is solved. The dynamic calculation of the spindle-bearing system is made. The model of Siemens CAT40 high-speed spindle is modeled. The dynamic characteristics of the bearing stiffness of the spindle bearing under different operating conditions are studied. The theoretical calculation and experimental results show that compared with the traditional calculation method, the built statics model can calculate the dynamic characteristics of the spindle at high speed with higher precision.