考虑主轴—刀柄—刀具结合面的高速主轴系统动力学特性有限元建模

高速主轴系统主轴—刀柄—刀具结合面动力学性能是影响主轴切削效率、加工质量以及加工性能的重要因素之一,而结合面的建模又是研究主轴系统动力学特性的基础。将主轴—刀柄—刀具结合面简化为分布弹簧,并基于并联转子的建模思想,采用有限元法完成了主轴系统的有限元建模。在明确分布弹簧的布置方式以及弹簧刚度的确定方法的基础上,提出考虑主轴—刀柄—刀具结合面的高速主轴系统动力学特性有限元建模流程。以安装BT系列刀柄的某立式加工中心主轴系统为例,利用所提出的方法进行有限元建模并求解刀尖点的频响函数,与实际测试的对比说明,该建模方法能够更好地模拟该主轴系统的动力学特性。

The Finite Element Modeling of High-speed Spindle System Dynamics with Spindle-holder-tool Joints

The dynamics of joints are one of the most important factor affecting the spindle cutting efficiency,processing quality,processing performance in the high-speed spindle system,which is also the foundation of studying the spindle system dynamics.The joints are simplified as the distributing spring,and the finite element modeling is carried out by the finite element method based on the modeling thought of parallel rotor system.After specifying the distribution pattern and stiffness-damper determination of the springs,the finite element modeling process of the spindle system dynamics is proposed,considering the spindle-holder-tool joints.Finally,taking the spindle system of a vertical machining center which installs the BT handle as example,the tip point frequency response function is solved by the finite element modeling using the proposed method.Through the comparison with the actual test,it is found that the proposed modeling approach can better simulate the spindle system dynamics.