Prediction of the dynamic stiffness of boring bars

The productivity of boring operations is limited by chatter vibrations, as an effect of the low dynamic stiffness and damping of these cantilevered structures. The origin of the beforementioned self-excited vibration is mainly related to the dynamic stiffness of the boring bar’s bending mode, which...

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Published in:IOP conference series. Materials Science and Engineering 2021-10, Vol.1193 (1), p.12007
Main Authors: Astarloa, A, Fernandes, M H, Mancisidor, I, Munoa, J, Dombovari, Z
Format: Article
Language:English
Subjects:
Beam theory (structures)
Boring bar
Boring tools
Cantilever members
Coupling
Damping
Dynamic models
Frequency response functions
FRF prediction
Machine tools
RCSA
Stiffness
Timoshenko beams
Vibration
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cited_by cdi_FETCH-LOGICAL-c2577-7771d2ab9f32ce7b9b90daa9e2694ec323a907894b904fa5d7952d54846d04333
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Dombovari, Z
description The productivity of boring operations is limited by chatter vibrations, as an effect of the low dynamic stiffness and damping of these cantilevered structures. The origin of the beforementioned self-excited vibration is mainly related to the dynamic stiffness of the boring bar’s bending mode, which is influenced by the stiffness and damping of the machine tool interface. In this paper a dynamic model is presented, which uses Timoshenko beam theory for the boring bar itself, while the effect of the clamping is experimentally determined applying Receptance Coupling Substructure Analysis (RCSA). The important effect of the boring head at the tool tip is considered on the coupling as well. This way, once the machine interface is characterized, the Frequency Response Functions (FRF) of different boring bars can be predicted.
doi_str_mv 10.1088/1757-899X/1193/1/012007
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subjects Beam theory (structures)
Boring bar
Boring tools
Cantilever members
Coupling
Damping
Dynamic models
Frequency response functions
FRF prediction
Machine tools
RCSA
Stiffness
Timoshenko beams
Vibration
title Prediction of the dynamic stiffness of boring bars
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