VDF850数控机床主轴动态特性分析
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摘要
基于VDF850数控机床主轴单元的动态特性,采用弹簧模拟主轴—轴承结合面的弹性支承,建立主轴单元动力学分析的有限元模型。利用有限元仿真软件ANSYS对主轴进行模态和谐响应分析,研究主轴固有频率和预紧力的映射关系,获得切削力激励主轴单元的频率响应特性。结果表明:主轴单元固有频率随预紧力的增加略有增大;主轴的一阶临界转速远大于最高转速8 000 r/min;主轴单元的动力学特性较好。
Based on the dynamic characteristics of the spindle unit of VDF850 machine tool, the spring was used to simulate the elastic support of the spindle-bearing interface, and the finite element model for the dynamic analysis of the spindle unit was established. The modal and harmonic response of the spindle were analyzed with the finite element simulation software ANSYS. The mapping relationship between natural frequency and pre-tightening force of the spindle was studied, and the frequency response characteristics of spindle unit excited by cutting force were obtained. The results show that the natural frequency of the spindle unit increases slightly with the increase of preload, the first critical speed of the spindle is much higher than the maximum speed of 8 000 r/min, and the dynamic characteristics of spindle unit are good.
Based on the dynamic characteristics of the spindle unit of VDF850 machine tool, the spring was used to simulate the elastic support of the spindle-bearing interface, and the finite element model for the dynamic analysis of the spindle unit was established. The modal and harmonic response of the spindle were analyzed with the finite element simulation software ANSYS. The mapping relationship between natural frequency and pre-tightening force of the spindle was studied, and the frequency response characteristics of spindle unit excited by cutting force were obtained. The results show that the natural frequency of the spindle unit increases slightly with the increase of preload, the first critical speed of the spindle is much higher than the maximum speed of 8 000 r/min, and the dynamic characteristics of spindle unit are good.
引文
[1]刘强,陈静,吴文镜,等.高性能数控机床几项关键设计技术的研究应用进展[J].航空制造技术,2009(5):42-45.
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[4]吴文镜,刘强.机床动力学建模的拓展传递矩阵法[J].机械工程学报,2010, 46(21):69-75.
[5]林剑峰,马晓波.数控机床动态特性测试与分析研究[J].机械制造,2016, 48(552):5-8.
[6] SHAN W, CHEN X, HE Y, et al. A novel experimental research on vibration characteristics of the running high-speed motorized spindles[J]. Journal of Mechanical Science and Technology,2013, 27(8):2245-2252.
[7] WANG J, WU B, HU Y, et al. Modeling and modal analysis of tool holder-spindle assembly on CNC milling machine using FEA[C]//International Conference on Mechatronics&Applied Mechanics. Trans Tech Publications,Switzerland, 2012:220-226.
[8]谭峰,殷国富,方辉,等.基于ANSYS Workbench的微型数控车床主轴动静态性能分析[J].组合机床与自动化加工技术,2015(4):29-32.
[9]蔡力钢,马仕明,赵永胜,等.多约束状态下重载机械式主轴有限元建模及模态分析[J].机械工程学报,2012, 48(3):165-173.
[10]李高峰,李文斌.高速磨削机床主轴单元的动态特性仿真分析[J].机械工程与自动化,2012(2):48-50.
[11]戴曙.机床滚动轴承应用手册[M].北京:机械工业出版社,1993:134-140.
[12]张定华.数控加工手册(第2卷)[M].北京:化学工业出版社,2013:187-191.
[2] LIN C W, TU J F. Model-based design of motorized spindle systems to improve dynamic performance at high speeds[J].Journal of Manufacturing Processes, 2007, 9(2):94-108.
[3]张伟刚,高尚晗,龙新华,等.机床主轴-滚动轴承系统非线性动力学分析[J].振动与冲击,2008, 27(9):72-75
[4]吴文镜,刘强.机床动力学建模的拓展传递矩阵法[J].机械工程学报,2010, 46(21):69-75.
[5]林剑峰,马晓波.数控机床动态特性测试与分析研究[J].机械制造,2016, 48(552):5-8.
[6] SHAN W, CHEN X, HE Y, et al. A novel experimental research on vibration characteristics of the running high-speed motorized spindles[J]. Journal of Mechanical Science and Technology,2013, 27(8):2245-2252.
[7] WANG J, WU B, HU Y, et al. Modeling and modal analysis of tool holder-spindle assembly on CNC milling machine using FEA[C]//International Conference on Mechatronics&Applied Mechanics. Trans Tech Publications,Switzerland, 2012:220-226.
[8]谭峰,殷国富,方辉,等.基于ANSYS Workbench的微型数控车床主轴动静态性能分析[J].组合机床与自动化加工技术,2015(4):29-32.
[9]蔡力钢,马仕明,赵永胜,等.多约束状态下重载机械式主轴有限元建模及模态分析[J].机械工程学报,2012, 48(3):165-173.
[10]李高峰,李文斌.高速磨削机床主轴单元的动态特性仿真分析[J].机械工程与自动化,2012(2):48-50.
[11]戴曙.机床滚动轴承应用手册[M].北京:机械工业出版社,1993:134-140.
[12]张定华.数控加工手册(第2卷)[M].北京:化学工业出版社,2013:187-191.