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State-dependent distributed-delay model of orthogonal cutting

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Abstract

In this paper, we present a model of turning operations with state-dependent distributed time delay. We apply the theory of regenerative machine tool chatter and describe the dynamics of the tool-workpiece system during cutting by delay differential equations. We model the cutting force as the resultant of a force system distributed along the rake face of the tool, which results in a short distributed delay in the governing equation superimposed on the large regenerative delay. According to the literature on stress distribution along the rake face, the length of the chip–tool interface, where the distributed cutting force system is acting, is function of the chip thickness, which depends on the vibrations of the tool-workpiece system due to the regenerative effect. Therefore, the additional short delay is state dependent. It is shown that involving state-dependent delay in the model does not affect linear stability properties, but does affect the nonlinear dynamics of the cutting process. Namely, the sense of the Hopf bifurcation along the stability boundaries may turn from sub- to supercritical at certain spindle speed regions.

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Acknowledgments

This work was supported by the Hungarian National Science Foundation under Grant OTKA- K105433 and OTKA-K101714. The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Advanced Grant Agreement No. 340889.

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Authors and Affiliations

  1. Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, Hungary

    Tamás G. Molnár, Tamás Insperger & Gábor Stépán

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  1. Tamás G. Molnár
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  2. Tamás Insperger
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  3. Gábor Stépán
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Correspondence to Tamás G. Molnár.

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Molnár, T.G., Insperger, T. & Stépán, G. State-dependent distributed-delay model of orthogonal cutting. Nonlinear Dyn 84, 1147–1156 (2016). https://doi.org/10.1007/s11071-015-2559-2

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