Analysis of dynamic properties of boring bars concerning different clamping conditions

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Henrik Åkesson, Tatiana Smirnova, Lars Håkansson
Title: Analysis of dynamic properties of boring bars concerning different clamping conditions
Journal: Mechanical Systems and Signal Processing
Year: 2009
Volume: 23
Issue: 8
Pagination: 2629-2647
ISSN: 0888-3270
Publisher: Elsevier Ltd
URI/DOI: 10.1016/j.ymssp.2009.05.012
ISI number: 000269289000016
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/ing/
Authors e-mail: henrik.akesson@bth.se
Language: English
Abstract: Boring bars are frequently used in the manufacturing industry to turn deep cavities in workpieces and are usually associated with vibration problems. This paper focuses on the clamping properties’ influence on the dynamic properties of clamped boring bars. A standard clamping housing of the variety commonly used in industry today has been used. Both a standard boring bar and a modified boring bar have been considered. Two methods have been used: Euler–Bernoulli beam modeling and experimental modal analysis. It is demonstrated that the number of clamping screws, the clamping screw diameter sizes, the screw tightening torques, the order the screws are tightened has a significant influence on a clamped boring bars eigenfrequencies and its mode shapes orientation in the cutting speed—cutting depth plane. Also, the damping of the modes is influenced. The results indicate that multi-span Euler–Bernoulli beam models with pinned boundary condition or elastic boundary condition modeling the clamping are preferable as compared to a fixed-free Euler–Bernoulli beam for modeling dynamic properties of a clamped boring bar. It is also demonstrated that a standard clamping housing clamping a boring bar with clamping screws imposes non-linear dynamic boring bar behavior.
Subject: Signal Processing\Active Noise and Vibration Control
Mechanical Engineering\Structural Dynamics
Keywords: Boring bar, Clamping housing, dynamic properties
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