Active Control Machine Tool Chatter Embedded Piezo Ceramic Actuators in Tool Holder Shank

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Lars Håkansson, Ingvar Claesson, Linus Pettersson, Thomas L Lagö
Title: Active Control Machine Tool Chatter Embedded Piezo Ceramic Actuators in Tool Holder Shank
Conference name: ASME 17th Biennial Conference on Mechanical Vibration and Noise
Year: 1999
City: Las Vegas
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, icl@bth.se, lar@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. These problems can be reduced by active control of machine-tool vibration. Adaptive feedback control based on the filtered-x LMS-algorithm, enables a reduction of the vibration by up to 40 dB at 1.5 kHz and by approximately 40 dB at 3 kHz. The active control performed a broadband attenuation of
the sound pressure level by up to 35 dB . A significant improvement of the workpiece surface was also observed. In the active control of tool vibration a tool holder construction based on integrated high magnetostrictive actuators was used. However, both the physical features and properties of an active tool holder construction based on high magnetostrictive actuators and the fact that this type of actuators generally have a non-linear behaviour highly reduce its applicability to the general lathe and turning operation. Therefor, a new generation embedded active tool holder shanks based on piezo ceramic actuators have been developed. Based on spectrum estimates, both coherence spectrum and frequency response function estimates has been calculated for both the old tool holder construction and the new generation active tool holder shank. From the results it follows that the phase delay is smaller and the linearity of the new generation active tool holder shank are superior compared to the old technology. It is also obvious that physical features and properties of new generation embedded active tool holder shanks based on piezo ceramic actuators fits the general lathe application.
Subject: Signal Processing\Active Noise and Vibration Control
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