Keywords: clamping housing, dynamic properties, hydraulic clamping, Hydrofix.

This paper focuses on changes in the dynamic properties of the tooling structure that arise due to different clamping conditions. To enable the development of tooling interfaces that provides enhanced dynamic stability to the tooling structure, the knowledge for example concerning the clamping housing influence on the boring bars dynamic properties has to be extended. Investigation concerning the influence on different clamping housing boundary conditions on the clamped boring bars dynamic properties has been carried out [1,2]. What is new and of significance in this paper are results concerning a new clamping housing structure which seems to posses stable properties. This clamping housing "Hydrofix" clamps the boring bar by means of hydraulic pressure. Standard clamping housings, on the other hand, usually clamp a boring bar by means of clamping screws. Also, a configuration with extreme fixing (inpractical to use on the shop floor) has been used as a reference. Results from experimental modal of the boring bar for the three different clamping configurations together with analytical models modelling each of these configurations is presented. While the Euler-Bernoulli multi-span boring bar model provides approximations of the low-order resonance frequencies and the corresponding spatial shapes of the modes for the standard clamping, a simpler Euler-Bernoulli single-span boring bar model might be sufficient for the case of a boring bar with the hydraulic clamping. Furthermore, the results from the experimental modal analysis of hydraulic clamping housing confirms the stable behavior of the boring bars dynamic properties. Foremost the repeatability, that is, when remounting the boring bar in the clamping housing, the dynamic properties changes insignificantly as compared to the standard clamping using screws. Also the nonlinear dynamic properties of the clamped boring bar are less significant using the hydraulic clamping compared to using the standard clamping.

1

H. Åkesson, T. Smirnova, T. Lagö, and L. Håkansson. "Analysis of dynamic properties of boring bars concerning different boundary conditions", Research Report No 2007:06 Blekinge Institute of Technology, March 2007.
ISSN: 1103-1581.

2

J. Scheuer, L. Håkansson, and I. Claesson. "Modal analysis of a boring bar using different clamping conditions", In Proceedings of the Eleventh International Congress on Sound and Vibration, ICSV11, St. Petersburg, Russia, 2004.

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