基于主轴系统动力学的铣削稳定性建模与分析
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摘要
高速切削技术具有加工精度高和表面质量好的特点,但在切削难加工材料时易发生颤振。基于主轴系统动力学进行铣削稳定性的建模与分析,采用有限元法建立主轴系统动力学模型,重点考虑主轴旋转时产生的离心力对结合面刚度的影响,分析主轴转速对结合面刚度和主轴系统频响函数的影响规律。结合主轴系统动力学特性和动态铣削过程建立铣削动力学模型,利用全离散法进行铣削稳定性预测,分析主轴转速、刀具直径和刀具悬伸量对铣削稳定域的影响规律。
High-speed cutting technology has the characteristics of high machining accuracy and good surface quality.It is easy to chatter when cutting difficult materials.The stability of milling is modeled and analyzed based on the dynamics of spindle system.The finite element method is used to establish the dynamics model of spindle system.The influence of centrifugal force generated when the spindle rotates on the stiffness of the interface is taken into account,and the influencing rules of spindle speed on the stiffness of the interface and the frequency-response function of the spindle system are analyzed.On the basis of the dynamics characteristic of spindle system and the process of dynamic milling,the dynamics model of milling is established.The milling stability is predicted by adapting the full discrete method,and then the influencing rules of the spindle speed,the cutter diameter and the magnitude of cutter overhanging on the milling stability are analyzed.
High-speed cutting technology has the characteristics of high machining accuracy and good surface quality.It is easy to chatter when cutting difficult materials.The stability of milling is modeled and analyzed based on the dynamics of spindle system.The finite element method is used to establish the dynamics model of spindle system.The influence of centrifugal force generated when the spindle rotates on the stiffness of the interface is taken into account,and the influencing rules of spindle speed on the stiffness of the interface and the frequency-response function of the spindle system are analyzed.On the basis of the dynamics characteristic of spindle system and the process of dynamic milling,the dynamics model of milling is established.The milling stability is predicted by adapting the full discrete method,and then the influencing rules of the spindle speed,the cutter diameter and the magnitude of cutter overhanging on the milling stability are analyzed.
引文
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[3]Ertürk A,Budak E,?zgüven H N.Selection of design and operational parameters in spindle-holder-tool assemblies for maximum chatter stability by using a new analytical model[J].International Journal of Machine Tools Manufacturer,2007,47(9):1401-1409.
[4]Gagnol V,Bouzgarrou B C,Ray P,et al.Stability-based spindle design optimization[J].Journal of Manufacturing Science & Engineering,2006,129(2):407-415.
[5]Hung J P,Lai Y L,Luo T L,et al.Analysis of the machining stability of a milling machine considering the effect of machine frame structure and spindle bearings:experimental and finite element approaches[J].International Journal of Advanced Manufacturing Technology,2013,68(9-12):2393-2405.
[6]张学良.机械结合面动态特性及应用[M].北京:中国科学技术出版社,2002.
[7]赵万华,杜超,张俊,等.主轴转子系统动力学解析建模方法[J].机械工程学报,2013,49(6):44-51.
[8]姜彦翠,刘献礼,吴石,等.考虑结合面和轴向力的主轴动力学特性[J].机械工程学报,2015,51(19):66-74.
[9]高相胜,张以都,张洪伟.主轴—刀柄结合面刚度建模方法[J].计算机集成制造系统,2013,19(1):61-66.
[10]Ding Y,Zhu L M,Zhang X J,et al.A full-discretization method for prediction of milling stability[J].International Journal of Machine Tools and Manufacture,2010,50(5):502-509.