Evaluation of dynamic stiffness of machine tool spindle by non-contact excitation tests

Abstract This paper presents a non-contact excitation method for evaluating the dynamic stiffness of a rotating spindle. The spindle response to an excitation force is measured, and frequency response functions (FRFs) are obtained. Based on the measured FRFs, dynamic uncertainty and its effect on cutting stability are investigated. Regenerative forces are generated using displacement feedback with a time lag element, and a closed-loop excitation test is executed automatically. The stability map obtained from the closed-loop test and the stability charts calculated from the FRFs are compared, and the uncertainty of the spindle dynamics during operations is clarified.

[1]  Eberhard Abele,et al.  Digitally controlled output filters for improvement of temperature behavior of machine tool main spindle drives , 2007, Prod. Eng..

[2]  Eiji Shamoto,et al.  Identification of transfer function by inverse analysis of self-excited chatter vibration in milling operations , 2012 .

[3]  Gábor Stépán,et al.  Improved prediction of stability lobes with extended multi frequency solution , 2013 .

[4]  Yusuf Altintas,et al.  Virtual Design and Optimization of Machine Tool Spindles , 2005 .

[5]  Gábor Stépán,et al.  Modelling nonlinear regenerative effects in metal cutting , 2001, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[6]  Lutfi Taner Tunc,et al.  Identification and modeling of process damping in turning and milling using a new approach , 2010 .

[7]  Eberhard Abele,et al.  System identification during milling via active magnetic bearing , 2007, Prod. Eng..

[8]  Y. Altintas,et al.  Thermo-mechanical model of spindles , 2010 .

[9]  Chi-Wei Lin,et al.  An integrated thermo-mechanical-dynamic model to characterize motorized machine tool spindles during very high speed rotation , 2003 .

[10]  Erhan Budak,et al.  Effect analysis of bearing and interface dynamics on tool point FRF for chatter stability in machine tools by using a new analytical model for spindle–tool assemblies , 2007 .

[11]  Matti Rantatalo,et al.  Milling machine spindle analysis using FEM and non-contact spindle excitation and response measurement , 2007 .

[12]  Kohei Asano,et al.  Non-contact Measurement of Dynamic Stiffness of Rotating Spindle , 2014 .

[13]  Jiri Tlusty,et al.  Nonlinearities in Spindle Bearings and Their Effects , 1986 .

[14]  Yusuf Altintas,et al.  Generalized dynamic model of metal cutting operations , 2013 .

[15]  Hisayoshi Sato,et al.  Behavior of Self-Excited Chatter Due to Multiple Regenerative Effect , 1981 .

[16]  Eberhard Abele,et al.  Creating Stability Lobe Diagrams during Milling , 2004 .

[17]  Uttara Kumar,et al.  Investigation of spindle bearing preload on dynamics and stability limit in milling , 2012 .

[18]  Christian Brecher,et al.  Machine tool spindle units , 2010 .

[19]  J. Tlusty,et al.  Basic Non-Linearity in Machining Chatter , 1981 .