Active Control of Chatter in Turning - The Origine of Chatter

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Lars Håkansson, Ingvar Claesson, Per-Olof Sturesson, Thomas L Lagö
Title: Active Control of Chatter in Turning - The Origine of Chatter
Conference name: 17th International Modal Analysis Conference (IMAC) on Modal Analysis - Reducing the Time to Market
Year: 1999
Pagination: 1799-1805
ISBN: 0-912053-64-X
Publisher: SOC EXPERIMENTAL MECHANICS INC
City: SOC EXPERIMENTAL MECHANICS INC
ISI number: 000079283700271
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: lha@bth.se
Language: English
Abstract: In the turning operation chatter or vibration is a frequent problem, which affects the result of the machining, and, in particular, the surface finish. Tool life is also influenced by vibration. Severe acoustic noise in the working environment frequently occurs as a result of dynamic motion between
the cutting tool and the workpiece. By proper machine design, e.g. improved stiffness of the machine structure, the problem of relative dynamic motion between cutting tool and workpiece may be partially solved. To achieve a further reduction of the dynamic motion between cutting tool and workpiece one solution is the active control of machine-tool vibration.
However, to successfully apply active control of tool vibration in the external turning operation the response of the tool holder shank has to be investigated in order to enable the proper introduction of secondary vibration in the tool holder shank and to select a suitable controller. The investigation of the dynamic response of the tool holder shank relies on a stochastic approach while the structural dynamic properties have been evaluated by a normal mode analysis. This resulted in active control of tool vibration in a lathe that enables a reduction of the vibration by up to 40 dB at 1.5 kHz and by approximately
40 dB at 3 kHz.
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: Acoustic noise, Turning, Cutting tools, Modal analysis, Lathes
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