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Influence of the join system turret-boring bar on machining performance of the cutting process
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.ORCID-id: 0000-0003-2511-7267
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
2010 (engelsk)Inngår i: CIRP 2nd International Conference on Process Machine Interactions / [ed] prof. Y. Altintas, Vancouver, 2010Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Obtaining the first part correctly is of vital importance. One way of achieving this is to implement solutions with machine tool components that can enable higher removal rates with unchanged or even improved machining performance. A solution is presented in this paper where the principle followed has been to enhance the damping capability of critical structural components of the machine tool (boring bar and turret), minimizing the loss of stiffness. An analytical model of the damping treatment used is presented. The model has been verified by the experimental modal analysis and the machining tests. The introduction of damping in the machine tool structure has been proved to enable machining in stable conditions over a larger range of cutting parameters. The interaction between the cutting process and the machine structure is therefore revealed.

sted, utgiver, år, opplag, sider
Vancouver, 2010.
Emneord [en]
Turret, damping, flexural rigidity, machining performance
HSV kategori
Forskningsprogram
SRA - Produktion
Identifikatorer
URN: urn:nbn:se:kth:diva-49760ISBN: 978-0-9866331-0-2 (tryckt)OAI: oai:DiVA.org:kth-49760DiVA, id: diva2:460253
Konferanse
CIRP 2nd International Conference on Process Machine Interactions. Vancouver, Canada. 10.06.-11.06.2010
Prosjekter
FFI-Robust Maskinbearbetning
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Merknad
QC 20111202Tilgjengelig fra: 2011-11-29 Laget: 2011-11-29 Sist oppdatert: 2012-04-13bibliografisk kontrollert
Inngår i avhandling
1. Improving Machining System Performance through designed-in Damping: Modelling, Analysis and Design Solutions
Åpne denne publikasjonen i ny fane eller vindu >>Improving Machining System Performance through designed-in Damping: Modelling, Analysis and Design Solutions
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

With advances in material technology, allowing, for instance, engines to withstand higher combustion pressure and consequently improving performance, comes challenges to productivity. These materials are, in fact, more difficult to machine with regards to tool wear and especially machine tool stability. Machining vibrations have historically been one of the major limitations to productivity and product quality and the cost of machining vibration for cylinder head manufacturing has been estimated at 0.35 euro per part.

The literature review shows that most of the research on cutting stability has been concentrating on the use of the stability limits diagram (SLD), addressing the limitations of this approach. On the other hand, research dedicated to development of machine tool components designed for chatter avoidance has been concentrating solely on one component at the time.

This thesis proposes therefore to extend the stability limits of the machining system by enhancing the structure’s damping capability via a unified concept based on the distribution of damping within the machining system exploiting the joints composing the machine tool structure. The design solution proposed is based on the enhancement of damping of joint through the exploitation of viscoelastic polymers’ damping properties consciously designed as High Damping Interfaces (HDI).

The tool-turret joint and the turret-lathe joint have been analysed. The computational models for dimensioning the HDI’s within these joints are presented in the thesis and validated by the experiments. The models offer the possibility of consciously design damping in the machining system structure and balance it with regards to the needed stiffness.

These models and the experimental results demonstrate that the approach of enhancing joint damping is viable and effective. The unified concept of the full chain of redesigned components enables the generation of the lowest surface roughness over the whole range of tested cutting parameters. The improved machining system is not affected by instability at any of the tested cutting parameters and offers an outstanding surface quality.

The major scientific contribution of this thesis is therefore represented by the proposed unified concept for designing damping in a machining system alongside the models for computation and optimisation of the HDIs.

From the industrial application point of view, the presented approach allows the end user to select the most suitable parameters in terms of productivity as the enhanced machine tool system becomes less sensitive to stability issues provoked by difficult-to-machine materials or fluctuations of the work material properties that may occur in ordinary production processes.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2012. s. 79
Serie
Trita-IIP, ISSN 1650-1888 ; 12:05
Emneord
Machining performance, Cutting stability, Passive damping, High Damping Interface, Boring bar, Turret
HSV kategori
Forskningsprogram
SRA - Produktion
Identifikatorer
urn:nbn:se:kth:diva-93143 (URN)978-91-7501-328-2 (ISBN)
Disputas
2012-05-04, M311, Brinellvägen 68, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Prosjekter
DampComatProduction 4 microFFI Robust Machining
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Merknad

QC 20120413

Tilgjengelig fra: 2012-04-13 Laget: 2012-04-12 Sist oppdatert: 2013-04-19bibliografisk kontrollert

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