Spindle vibration mitigation utilizing additively manufactured auxetic materials

• Published in: Journal of manufacturing processes Vol. 73; pp. 633 - 641
• Main Authors: Kim, Jungsub, Hegde, Himanshu, Kim, Hyo-young, Lee, ChaBum
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2022
• Subjects: Additive manufacturing; Auxetic material; Damping; Spindle dynamics; Vibration control; Damping; Vibration control; Additive manufacturing; Spindle dynamics; Auxetic material
• ISSN: 1526-6125; 2212-4616
• DOI: 10.1016/j.jmapro.2021.11.051

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.