基于dyna971的数控镗铣机床动态模拟仿真

Dynamic simulation based on dyna971 for computer numerical control boring and milling machine

落地式数控镗铣机床结构复杂,为保证机床具有良好的动态性能,在开发设计该类机床时要进行整机的动态模拟仿真分析。针对这一要求,提出一种实际设计中实用化程度较高的机床动态模拟仿真思路,首先对数控落地镗铣机床样机进行模态试验,获取床身滑座、滑座立柱、立柱主轴箱等结合面的模态参数,在对模态参数进行有限元方法优化识别后,利用COMBIN14单元模拟优化后的结合部参数建立机床整机有限元模型。在dyna971软件平台对整机有限元模型进行动态模拟仿真,从模拟仿真分析结果可以看出机床在受到外界作用力时,其输出的应力和应变变化波形平稳,说明经过上述分析而设计出的机床具有良好的动态性能。目前,该研究成果已应用于此类型机床的批量生产。

To ensure good dynamic performance, a dynamic simulation analysis is needed for Computer Numerical Control （CNC） floor type boring and milling machine in the design stage because of its complex structure. According to the request, a dynamic simulation idea with a practical effect was presented. The proposed scheme firstly obtained modal parameters of joint surface such as bed-slide, slide-column, column-spindle box via the modal test of CNC floor boring and milling machine tool prototype; then joint parameters obtained by finite element optimization identification of modal parameters and furthermore simulated by COMBIN14 element were used to establish the finite element model of CNC. With the dynamic simulation on the dyna971 software platform, a good dynamic characteristic was displayed due to reposeful waveform of stress and strain, while machine tool was subject to external force effect. At present, the research result had been integrated into batch production of this kind of machine.