基于均布弹簧模型的电主轴有限元建模及动态特性分析
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摘要
为了研究轴承刚度、结合面刚度等各个参数对电主轴动态特性的影响、验证弹簧模型在电主轴建模中的适用性,基于国产电主轴170XDS20Z11,使用有限元方法,利用Ansys workbench对电主轴单元进行建模。首先分别建立刀具、刀柄和主轴的模型,结合实验进行动静态特性的分析与验证;然后基于均布弹簧的模型对刀柄—刀具结合面、刀柄—主轴结合面和轴承进行建模,通过对实验数据的拟合得到了结合面弹簧的刚度数值,通过预测刀尖点频响函数的方法验证该模型的准确性。研究得出了轴承刚度和结合面刚度的最佳范围,证明了弹簧模型的准确性和实用性。
In order to study the influence of various parameters such as bearing stiffness and joint stiffness on the dynamic characteristics of the electric spindle, and to verify the applicability of the spring model in the modeling of the electric spindle, based on the domestic electric spindle 170 XDS20 Z11, using the finite element method, the Ansys workbench was used for the electric spindle modeling. Firstly, each tool was established separately, and the dynamic and static characteristics were analyzed and verified in combination with the experiment. Then the tool-handle-tool interface, the tool-spindle combination surface and the bearing were modeled based on the spring model, and the experimental data were obtained. and the accuracy of the model is verified by predicting the frequency response function of the tool tip point. The optimal range of bearing stiffness and joint stiffness was studied and the accuracy and practicality of the spring model was proved.
In order to study the influence of various parameters such as bearing stiffness and joint stiffness on the dynamic characteristics of the electric spindle, and to verify the applicability of the spring model in the modeling of the electric spindle, based on the domestic electric spindle 170 XDS20 Z11, using the finite element method, the Ansys workbench was used for the electric spindle modeling. Firstly, each tool was established separately, and the dynamic and static characteristics were analyzed and verified in combination with the experiment. Then the tool-handle-tool interface, the tool-spindle combination surface and the bearing were modeled based on the spring model, and the experimental data were obtained. and the accuracy of the model is verified by predicting the frequency response function of the tool tip point. The optimal range of bearing stiffness and joint stiffness was studied and the accuracy and practicality of the spring model was proved.
引文
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[10] A Ertürk,H ?zgüven,E Budak.Analytical modeling of spindle-tool dynamics on machine tools using Timoshenko beam model and receptance coupling for the prediction of tool point FRF[J].International Journal of Machine Tools & Manufacture, 2006 (46): 1901-1912.
[2] Teng Liu.Analytical modeling for thermal errors of motorized spindle unit[J].International Journal of Machine Tools & Manufacture,2017 (112) :53-70.
[3] Hongrui Cao.Chatter stability of milling with speed-varying dynamics of spindles[J]. International Journal of Machine Tools & Manufacture, 2012 (52):50-58.
[4] 孟德浩.高速电主轴动态特性及其对加工稳定性的影响[D].上海:上海交通大学,2012.
[5] NiccolòGrossi, Filippo Montevecchi,Antonio Scippa,et al.3D Finite Element Modeling of Holder-Tool Assembly for Stability Prediction in Milling[J].Procedia CIRP 31,DOI:10.1016/j.procir.2015.03.031.
[6] 徐浩,许颖. 高速机床主轴用陶瓷球轴承动态性能试验分析[J].轴承, 2005(2):28-29.
[7] 蒋兴奇.主轴轴承热特性及对速度和动力学性能影响的研究[D].杭州:浙江大学,2007.
[8] Mehdi Namazi,Yusuf Altintas,Taro Abe,et al.Modeling and identification of tool holder-spindle interface dynamics[J].International Journal of Machine Tools & Manufacture,2007 (47) :1333-1341.
[9] 陈建.高速HSK热装工具系统结合部的参数辨识理论及切削稳定性研究[D].镇江:江苏大学,2015.
[10] A Ertürk,H ?zgüven,E Budak.Analytical modeling of spindle-tool dynamics on machine tools using Timoshenko beam model and receptance coupling for the prediction of tool point FRF[J].International Journal of Machine Tools & Manufacture, 2006 (46): 1901-1912.