As metal boring bars have low dynamic stiffness, chatter is easily induced during the boring process. Therefore, improvement of the chatter stability is an open problem that requires further study. Though researchers proved that the composite materials suitable for making tapered boring bars can further improve the dynamic stiffness to meet the need of high-speed boring, existing research studies did not study the dynamic characteristics of the tapered composite boring bar comprehensively. In particular, no research has been done about the natural frequency and chatter stability of the composite boring bar under various taper ratios. Therefore, in this paper, a model of a tapered composite boring bar is established based on the Adomian modified decomposition method (AMDM). Second, this paper verifies the effectiveness of the AMDM by using the ANSYS software. Moreover, this paper studies the natural frequency of the boring bar model under various situations. Third, we verify the convergence of chatter stability of the boring bar model. Finally, the chatter stability of the tapered composite boring bar is analyzed comprehensively. The results show that the natural frequency and the chatter stability of the tapered model can be improved by choosing appropriate taper ratio, ply angle, stacking sequences, L/D ratio, T/D ratio, and the carbon composite. The results are helpful for the design of high-quality tapered composite boring bars matching the need of high speed cutting. In particular, these results can provide guidelines for adjusting the cutting speed in CNC boring and can further improve the surface finish of the machined workpieces.

中文翻译：

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锥形复合镗杆的振动和颤振稳定性分析

由于金属镗杆的动态刚度低，因此在镗削过程中容易引起震颤。因此，颤振稳定性的改善是一个未解决的问题，需要进一步研究。尽管研究人员证明适用于制造锥形镗杆的复合材料可以进一步提高动态刚度以满足高速镗孔的需求，但现有的研究并未全面研究锥形复合镗杆的动力学特性。特别是，没有研究在各种锥度比下复合镗杆的固有频率和颤振稳定性。因此，本文基于Adomian修正分解方法（AMDM）建立了锥形复合镗杆模型。第二，本文使用ANSYS软件验证了AMDM的有效性。此外，本文研究了在各种情况下镗杆模型的固有频率。第三，我们验证了镗杆模型的颤振稳定性的收敛性。最后，对锥形复合镗杆的颤振稳定性进行了综合分析。结果表明，通过选择适当的锥度比，铺层角度，堆垛顺序，可以改善锥形模型的固有频率和颤振稳定性，L / D比，T / D比和碳复合物。这些结果有助于设计出满足高速切削需求的高质量锥形复合镗杆。特别地，这些结果可以为调整CNC镗孔中的切削速度提供指导，并可以进一步改善加工工件的表面光洁度。