Effect of the Machine Frame Structures on the Frequency Responses of Spindle Tool

Chatter vibration has been a troublesome problem for a machine tool toward the high precision and high speed machining. Essentially, the machining performance is determined by the dynamic characteristics of the machine tool structure and dynamics of cutting process. Therefore the dynamic vibration behavior of spindle tool system greatly determines the performance of machine tool. The purpose of this study is to investigate the influences of the machine frame structure on the dynamic frequency of spindle tool unit through finite element modeling approach. To this end, a realistic finite element model of the vertical milling system was created by incorporated the spindle-bearing model into the spindle head stock of the machine frame. Using this model, the dynamic characteristics of the milling machines with different structural designs of spindle head stock and identical spindle tool unit were demonstrated. The results of the finite element modeling reveal that the spindle tool unit behaves more compliant when the excited frequency approaches the natural mode of the spindle tool; while the spindle tool show a higher dynamic stiffness at lower frequency that may be initiated by the structural mode of milling head. Under this condition, it is concluded that the structural configuration of spindle head stock associated with the vertical column of milling machine plays an important role in determining the machining dynamics of the spindle unit. Keywords—Machine tools, Compliance, Frequency response function, Machine frame structure, Spindle unit

[1]  M. Sulitka,et al.  CALCULATION OF SPINDLE COMPLIANCE CONSIDERINGS ITS INTERACTION WITH MACHINE FRAME , 2010 .

[2]  Yoshimi Ito,et al.  Modular Design for Machine Tools , 2008 .

[3]  Yusuf Altintas,et al.  Analytical Prediction of Chatter Stability in Milling—Part II: Application of the General Formulation to Common Milling Systems , 1998 .

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

[5]  Giacomo Bianchi,et al.  The effects of dynamic interaction between machine tool subsystems on cutting process stability , 2012 .

[6]  Yoonho Seo,et al.  Structure modeling of machine tools and Internet-based implementation , 2005, Proceedings of the Winter Simulation Conference, 2005..

[7]  Ching-Yuan Lin,et al.  Modeling the machining stability of a vertical milling machine under the influence of the preloaded linear guide , 2011 .

[8]  Matej Sulitka,et al.  Simulation of dynamic properties of a spindle and tool system coupled with a machine tool frame , 2011 .

[9]  Andreas Archenti,et al.  Virtual Machining System Engine for Simulation of Process Machine Interaction , 2012 .

[10]  J. Tlusty,et al.  Dynamics of High-Speed Milling , 1986 .

[11]  Yusuf Altintas,et al.  Analytical Prediction of Chatter Stability in Milling—Part I: General Formulation , 1998 .

[12]  Yusuf Altintas,et al.  Analytical Prediction of Stability Lobes in Milling , 1995 .

[13]  Yusuf Altintas,et al.  Modeling of spindle-bearing and machine tool systems for virtual simulation of milling operations , 2007 .

[14]  Erhan Budak,et al.  Analytical modeling of spindle-tool dynamics on machine tools using Timoshenko beam model and receptance coupling for the prediction of tool point FRF , 2006 .