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Influence of Process Damping on the Regenerative Instability of Guided Metal Circular Sawing


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1 Indian Institute of Technology Kanpur, Kanpur, India., India
     

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Circular saws are thin and hence they vibrate during cutting. Vibrations get imprinted on the side walls of the part being cut, with each tooth leaving its own imprint. When there is a phase shift of vibrations between two successive teeth, regenerative instabilities can occur. However, since the flank face of the tooth also rubs the vibration marks on the side wall, there can also be process-induced damping. Such damping is known to improve the stability of low speed cutting processes. Since metal circular sawing is a low-speed process, it is the aim of this paper to characterize the role of process damping, if any, on regenerative instabilities using an analytical model. The saw is modelled as an annular disc constrained by springs representing guides. The Muller method with deflation is used to solve the governing equations of motion. Model-based analysis suggests that process damping indeed plays a stabilizing role.

Keywords

Regenerative Instabilities, Damping, Vibrations, Circular Sawing.
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  • Altintas, Y., & Budak, E. (1995). Analytical prediction of stability lobes in milling. CIRP annals. 44(1), 357-62. https://doi.org/10.1016/S0007-8506 (07)62342-7

  • Eynian, M. (2010). Chatter stability of turning and milling with process damping. Ph.D Thesis, University of British Columbia, Canada.

  • Gurdal, O., Erdum, O., & Sims, N.D. (2016). Analysis of process damping in milling. Procedia CIRP, 55, 152-157. https://doi.org/10.1016/j.procir. 2016.09.012

  • Hutton, S. G., Chonan, S., & Lehmann, B. F. (1986). Dynamic response of a guided circular saw. Journal of Sound and Vibration, 112(3), 527-539. https://doi.org/10.1016/S0022-460X (87)80116-5

  • Lehmann, B. F., & Hutton, S. G. (1988). Self-excitation in guided circular saws. Journal of Vibration and Acoustics, 110(3), 338-344. https://doi.org/10.1115/1.3269522

  • Mathews, J. H. (1992). Numerical methods for mathematics, science and engineering. Englewood Cliff, Inc. second edition NJ: Prentice-Hall.

  • Singhania, S., Kumar, P., Gupta, S.K., & Law, M. (2019). Influence of guides on critical speeds of circular saws. Advances in Computational Methods in Manufacturing, Springer, 519-530 edited by R. Narayanan., S. Joshi., & U. Dixit. IIT Guwahati. https://doi.org/10.1007/978-981-32-9072-3_45

  • Singhania, S., Singh, A., & Law, M. (2022). Dynamics and stability of metal cutting circular saws with distributed and lubricated guides. Journal of Vibration Engineering & Technologies,1-13. https://doi.org/10.1007/s42417-022-00544-6

  • Singhania, S., & Law, M. (2021). Regenerative instabilities of spring-guided circular saws. 9th CIRP Conference on High Performance Cutting, 101,142-145. edited by E. Ozturk., D. Curtis., & H. Ghadbeigi. https://doi.org/10.1016/j. procir.2021.02.017

  • Tian, J. F., & Hutton, S. G. (1999). Self-excited vibration in flexible rotating disks subjected to various transverse interactive forces: A general approach. ASME Journal of Applied Mechanics, 800-805. https://doi.org/10.1115/1.2791758

  • Tian, J. F., & Hutton, S.G. (2001). Cutting-induced vibration in circular saws. Journal of Sound and Vibration, 242(5), 907-922. https://doi. org/10.1006/jsvi.2000.3397

  • Wallace, P. W., & Andrew, C. (1965). Machining Forces: Some Effects of Tool Vibration. Journal of Mechanical Engineering Science, 7(2), 152-62. https://doi.org/10.1243/jmes_ jour_1965_007_023_02


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  • Influence of Process Damping on the Regenerative Instability of Guided Metal Circular Sawing

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Authors

Sunny Singhania
Indian Institute of Technology Kanpur, Kanpur, India., India
Mohit Law
Indian Institute of Technology Kanpur, Kanpur, India., India

Abstract


Circular saws are thin and hence they vibrate during cutting. Vibrations get imprinted on the side walls of the part being cut, with each tooth leaving its own imprint. When there is a phase shift of vibrations between two successive teeth, regenerative instabilities can occur. However, since the flank face of the tooth also rubs the vibration marks on the side wall, there can also be process-induced damping. Such damping is known to improve the stability of low speed cutting processes. Since metal circular sawing is a low-speed process, it is the aim of this paper to characterize the role of process damping, if any, on regenerative instabilities using an analytical model. The saw is modelled as an annular disc constrained by springs representing guides. The Muller method with deflation is used to solve the governing equations of motion. Model-based analysis suggests that process damping indeed plays a stabilizing role.

Keywords


Regenerative Instabilities, Damping, Vibrations, Circular Sawing.

References