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Technical Brief

Chatter Detection in Turning Processes Using Coherence of Acceleration and Audio Signals

[+] Author and Article Information
Katja M. Hynynen

LUT Energy,
Lappeenranta University of Technology,
Lappeenranta FI-53851, Finland
e-mail: katja.hynynen@lut.fi

Juho Ratava

LUT Mechanical Engineering,
Lappeenranta University of Technology,
Lappeenranta FI-53851, Finland
e-mail: ratava@lut.fi

Tuomo Lindh

LUT Energy,
Lappeenranta University of Technology,
Lappeenranta FI-53851, Finland
e-mail: tuomo.lindh@lut.fi

Mikko Rikkonen, Ville Ryynänen, Mika Lohtander, Juha Varis

LUT Mechanical Engineering,
Lappeenranta University of Technology,
Lappeenranta FI-53851, Finland

Manuscript received September 5, 2013; final manuscript received February 6, 2014; published online May 21, 2014. Assoc. Editor: Tony Schmitz.

J. Manuf. Sci. Eng 136(4), 044503 (May 21, 2014) (4 pages) Paper No: MANU-13-1338; doi: 10.1115/1.4026948 History: Received September 05, 2013; Revised February 06, 2014

Chatter is an unfavorable phenomenon in turning operation causing poor surface quality. Active chatter elimination methods require the chatter to be detected before the control reacts. In this paper, a chatter detection method based on a coherence function of the acceleration of the tool in the x direction and an audio signal is proposed. The method was experimentally tested on longitudinal turning of a stock bar and facing of a hollow bar. The results show that the proposed method detects the chatter in an early stage and allows correcting control actions before the chatter influences the surface quality of the workpiece. The method is applicable both to facing and longitudinal turning.

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Copyright © 2014 by ASME
Topics: Chatter , Signals , Turning
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References

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Figures

Grahic Jump Location
Fig. 1

Stability diagram represents the stable cutting areas as a function of spindle speed and depth of cut

Grahic Jump Location
Fig. 2

Acceleration signal amplitude and corresponding spectrogram displaying coherence between the acceleration in the radial direction and the audio signal measured from the manual lathe

Grahic Jump Location
Fig. 3

Chatter detection measurement in facing with a CNC turning machine and a hollow cylinder. The coherence function between the acceleration of the tool in the x direction and the audio signal.

Grahic Jump Location
Fig. 4

Chatter elimination measurement. The coherence function between the acceleration of the tool in the x direction and the audio signal, and the spindle speed n.

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