A New Mechanism Explaining High Frequency Chatter Vibration Involving Tool Tip X-Y Looping in Fine Boring

[+] Author and Article Information
Evita Edhi, Tetsutaro Hoshi

Toyohashi University of Technology (TUT), Production Systems Engineering Department, 1-1 Hibarigaoka, Tenpaku Cho, Toyohashi, Aichi 441-8580, Japan

J. Dyn. Sys., Meas., Control 123(3), 370-376 (Feb 25, 2000) (7 pages) doi:10.1115/1.1387017 History: Received February 25, 2000
Copyright © 2001 by ASME
Topics: Vibration , Chatter , Cutting
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Merrit,  H. E., 1965, “Theory of Self-Excited Machine Tool Chatter,” Trans. ASME, 87, No. 4, pp. 447–454.
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Hoshi,  T., and Takemura,  T., 1972, “Cutting Dynamics Associated with Vibration Normal to Cut Surface,” Bul. Faculty of Eng. Kyoto Univ,34, No. 4, Oct. pp. 373–392.
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Arnold,  R. N., 1946, “The Mechanism of Tool Vibration in the Cutting of Steel,” Proc. Inst. Mech. Eng., 154, pp. 261–284.
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Boring tools used for experiments
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Experimental setup for cutting test and structural dynamic test on vertical machining center
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Example set of chatter measurement
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Phase lag between inner and outer modulation
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Result of cutting tests describing the phase angle ∠Y/X between X and Y vibration displacement and the phase lag φ between inner and outer modulations
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Compliance frequency response function measured by sinusoidal excitation in θ=45 and 135 deg orientations of tool C mounted on setting head R. Amplitude of chatter vibration observed in cutting tests is also shown in the lower part.
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Cutting edge oscillation in looped path as identified on boring tools B and C in cutting experiments under the dynamic cutting force Fc
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Cutting process dynamics Fcx/X and Fcy/X due to the regeneration effect and the imaginary part effect of inner modulation as presented in a stiffness polar diagram. The structural dynamics Fmx/X and Fmy/Y are also shown.
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Comparison of amounts of energy supplied per cycle Es and dissipated Ed computed for all cases of cutting tests observed with onset of chatter
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Average values of percentage share between mechanisms calculated for energy supplied and dissipated
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Two orthogonal orientations m1 and m2 of the natural bending vibration at the end part of boring tool having non-circular cross section
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Comparison of time phase between X and Y dynamic cutting force components calculated versus time phase experimentally measured between X and Y vibration displacements for all cases of cutting test observed with chatter



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