TY - GEN
T1 - Theory of torsional chatter in twist drills
T2 - ASME 2000 International Mechanical Engineering Congress and Exposition, IMECE 2000
AU - Bayly, Philip V.
AU - Metzler, Sandra A.
AU - Schaut, Adam J.
AU - Young, Keith A.
N1 - Funding Information:
Research was supported by The Boeing Company and by the National Science Foundation Grants DMI-9900108 (GOALI) and CMS-9625161 (CAREER). We would like to thank Jeremiah Halley, David Dilley, Michael Lamar and Ryan Hanks for their technical contributions.
Publisher Copyright:
Copyright © 2000 by ASME.
PY - 2000
Y1 - 2000
N2 - The mechanism of torsional chatter in drilling differs qualitatively and quantitatively from other types of chatter. In this paper we show that torsional chatter can be explained by the torsional-axial coupling inherent in a twisted beam; the beam "untwists"and extends in response to an increase in cutting torque. Based on a model of this mechanism, predictions of stability boundaries and chatter frequencies are derived by frequency domain analysis, and confirmed by numerical simulation and experimental tests. The effect of the torsional-axial coupling is opposite that of traditional cutting in that an increase in cutting forces leads to axial extension and greater chip load. Because of this sign difference, the limiting depth of cut is governed by the positive real part of the frequency response function, which explains the unexpected fact that torsional chatter occurs below the natural frequency of the tool.
AB - The mechanism of torsional chatter in drilling differs qualitatively and quantitatively from other types of chatter. In this paper we show that torsional chatter can be explained by the torsional-axial coupling inherent in a twisted beam; the beam "untwists"and extends in response to an increase in cutting torque. Based on a model of this mechanism, predictions of stability boundaries and chatter frequencies are derived by frequency domain analysis, and confirmed by numerical simulation and experimental tests. The effect of the torsional-axial coupling is opposite that of traditional cutting in that an increase in cutting forces leads to axial extension and greater chip load. Because of this sign difference, the limiting depth of cut is governed by the positive real part of the frequency response function, which explains the unexpected fact that torsional chatter occurs below the natural frequency of the tool.
UR - https://www.scopus.com/pages/publications/85119838381
U2 - 10.1115/IMECE2000-1893
DO - 10.1115/IMECE2000-1893
M3 - Conference contribution
AN - SCOPUS:85119838381
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 899
EP - 908
BT - Manufacturing Engineering
PB - American Society of Mechanical Engineers (ASME)
Y2 - 5 November 2000 through 10 November 2000
ER -