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首页> 外文期刊>International Journal of Mechanical Sciences >Milling stability analysis with considering process damping and mode shapes of in-process thin-walled workpiece
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Milling stability analysis with considering process damping and mode shapes of in-process thin-walled workpiece

机译：考虑过程阻尼和模式形状的铣削稳定性分析薄壁工件

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摘要

As an unfavorable factor of machining process, chatter threatens the machined quality of workpiece, which determines the assembly and fatigue performance of the workpiece. During the interaction between machine tool and thin-walled workpiece, the process damping effect, multiple modes response and dynamic changes caused by the material removal of the in-process workpiece (IPW) will make the machining process more complicated and introduce great difficulties to dynamic modeling and performance prediction. In this paper, we considered the process damping determined by the indentation volume between flank face of milling tool and machined surface, and used multi-mode model to describe this behavior. In order to establish the assembled material removal model of the IPW dynamics with multiple modes, the structure dynamic modification (SDM) and finite element method (FEM) were combined together. The updated third-order full discretization method was applied to solve the dynamic equation in modal space. Then, the three-dimensional stability lobe diagrams (SLDs) with and without material removal along the tool path were obtained respectively by enveloping multiple modes of the IPW and milling tool together. Finally, the cutting tests were carried out. The experiments showed that the assembled model could predict the dynamics of IPW accurately, and the proposed stability analysis model was relatively close to experimental results. Besides, the modes of thin-walled workpiece with weak rigidity do not always play a dominant role in the process of machining. Although the material removal rate is limited by considering the multiple modes of the system, the processing quality can be ensured.
机译：作为加工过程的不利因素，Chatter威胁到工件的加工质量，这决定了工件的组装和疲劳性能。在机床和薄壁工件之间的相互作用过程中，过程阻尼效果，多种模式响应和由材料拆除工艺工件（IPW）引起的动态变化将使加工过程更加复杂，引入巨大的动态困难建模与性能预测。在本文中，我们考虑了由铣削工具和机加工表面的侧面之间的压痕体积确定的处理阻尼，以及使用多模型来描述这种行为。为了建立具有多种模式的IPW动态的组装材料去除模型，结构动态修改（SDM）和有限元方法（FEM）组合在一起。应用更新的三阶全离散化方法来解决模态空间中的动态方程。然后，通过将多种IPW和铣削工具包裹在一起，分别通过将多种IPW和铣削工具包裹在一起获得具有沿着刀具路径的材料的三维稳定性凸角图（SLD）。最后，进行切割测试。实验表明，组装模型可以准确地预测IPW的动态，并且所提出的稳定性分析模型相对较低的实验结果。此外，薄壁工件的模式较弱的刚性较弱并不总是在加工过程中发挥主导作用。尽管通过考虑系统的多种模式，材料去除率受到限制，但可以确保处理质量。

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