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Modal Analysis of a Boring Bar using Different Clamping Conditions
Responsible organisation
2004 (English)Conference paper, (Refereed) Published
Abstract [en]

The internal turning operation is a common metal working process that is usually associated with vibration problems. Boring bars are often long and slender, making them prone to vibration when they are excited by the cutting forces introduced by the material deformation process in boring. The vibration causes degraded surface finish of the machined work piece, decreased tool life of inserts and boring bars, noise and other unwanted effects. Therefore, time-consuming planning and preparation have to be made in order to minimize vibration, affecting the cost of the machining process in the negative direction. It is possible to stabilize boring bars using active vibration control. To be able to do so, the dynamic properties of the bars have to be known in detail. Furthermore, with this knowledge, the results of using prediction tools for relating cutting parameters to cutting results may be significantly improved thanks to more relevant input data into the prediction tools. The effect of different clamping conditions on the dynamic properties of a boring bar's fundamental bending modes has been studied. Modal analysis was performed on a 40 mm-diameter boring bar with 100 mm clamping length and 200 mm overhang, making the L/D ratio 5. The clamping conditions have been varied by use of two different clamping devices. In each clamping device, several different clamping conditions were achieved by using different torque on the clamping screws. Results show that both the eigenfrequencies and the directions of the fundamental bending modes vary considerably due to the clamping conditions used.

Place, publisher, year, edition, pages
St. Petersburg, Russia, 2004.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:bth-9801Local ID: oai:bth.se:forskinfo8CCEC2123CBC2F75C1256F020068F796OAI: oai:DiVA.org:bth-9801DiVA: diva2:837748
Conference
Eleventh International Congress on Sound and Vibration, ICSV11
Available from: 2012-09-18 Created: 2004-09-01 Last updated: 2015-06-30Bibliographically approved

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Håkansson, LarsClaesson, Ingvar
Applied Mechanics

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