This paper presents novel spindle holders fabricated by using auxetic materials for spindle vibration mitigation. Unlike traditional spindle vibration suppression methods using anti-vibration tool holders or software-based dampers, auxetic material-based spindle holders enhance energy absorption and vibration damping under cyclic loading, providing sufficient stiffness and compactness. The re-entrant hexagon type auxetic structures commonly used in auxetic design were fabricated by various additive manufacturing (AM) processes such as fused deposition modeling (FDM) using carbon fiber-reinforced polymer (CFRP), powder bed fusion process (PBF) using titanium (Ti). Static and dynamic behaviors of two auxetic materials (CFRP Auxetic, Ti Auxetic) were characterized by finite element analysis (FEA), and were experimentally identified by characterizing stiffness, damping, frequency response function, vibration power transmissibility, vibration spectrum and power spectral density, and those results were compared with those of the control group to quantitatively characterize how auxetic materials impact on spindle vibration mitigation and improve spindle operations. As a result, the auxetic material-based spindle holders have high damping characteristics and showed a decrease in the spindle vibration magnitude compared to the control group. Also, it was confirmed that the auxetic material-based spindle holder can effectively suppress the spindle vibration when the spindle is idling or machining, as an alternative vibration damper. The development of the AM processes toward high part accuracy will enable further development of auxetic structures for spindle vibration mitigation.

本文介绍了使用拉胀材料制造的新型主轴支架，用于缓解主轴振动。与使用抗振刀架或基于软件的阻尼器的传统主轴振动抑制方法不同，基于拉胀材料的主轴架可增强循环载荷下的能量吸收和振动阻尼，提供足够的刚度和紧凑性。拉胀设计中常用的凹进六边形拉胀结构是通过各种增材制造 (AM) 工艺制造的，例如使用碳纤维增强聚合物 (CFRP) 的熔融沉积建模 (FDM)、使用钛的粉末床融合工艺 (PBF) (Ti)。通过有限元分析 (FEA) 表征了两种拉胀材料 (CFRP Auxetic、Ti Auxetic) 的静态和动态行为，并通过表征刚度、阻尼、频率响应函数、振动功率传递率、振动谱和功率谱密度进行实验识别，并将这些结果与对照组的结果进行比较，以定量表征拉胀材料对主轴减振的影响并改善主轴操作。因此，与对照组相比，基于拉胀材料的主轴支架具有高阻尼特性，并且主轴振动幅度有所降低。此外，经证实，拉胀材料主轴支架可有效抑制主轴空转或加工时的主轴振动，作为替代减振器。