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Design, Implementation and Analysis of Composite Material Dampers for Turning Operations
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.ORCID-id: 0000-0001-9185-4607
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. (Maskin- och processteknologi)
2009 (Engelska)Ingår i: International Conference on Mechanical Engineering, 2009, s. 613-620Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper introduces a novel design for boring bar with enhanced damping capability. The principle followed in thedesign phase was to enhance the damping capability minimizing theloss in static stiffness through implementation of composite materialinterfaces. The newly designed tool has been compared to a conventional tool. The evaluation criteria were the dynamic characteristics, frequency and damping ratio, of the machiningsystem, as well as the surface roughness of the machined workpieces.The use of composite material in the design of damped tool has been demonstrated effective. Furthermore, the autoregressive moving average (ARMA) models presented in this paper take in to consideration the interaction between the elastic structure of themachine tool and the cutting process and can therefore be used to characterize the machining system in operational conditions.

Ort, förlag, år, upplaga, sidor
2009. s. 613-620
Nyckelord [en]
ARMA, cutting stability, damped tool, machining.
Nationell ämneskategori
Maskinteknik
Forskningsämne
SRA - Produktion
Identifikatorer
URN: urn:nbn:se:kth:diva-28000OAI: oai:DiVA.org:kth-28000DiVA, id: diva2:383240
Konferens
ICME International Conference on Mechanical Engineering
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Anmärkning
QC 20110110Tillgänglig från: 2011-01-04 Skapad: 2011-01-04 Senast uppdaterad: 2012-04-13Bibliografiskt granskad
Ingår i avhandling
1. Improving Machining System Performance through designed-in Damping: Modelling, Analysis and Design Solutions
Öppna denna publikation i ny flik eller fönster >>Improving Machining System Performance through designed-in Damping: Modelling, Analysis and Design Solutions
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. 79
Serie
Trita-IIP, ISSN 1650-1888 ; 12:05
Nyckelord
Machining performance, Cutting stability, Passive damping, High Damping Interface, Boring bar, Turret
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Forskningsämne
SRA - Produktion
Identifikatorer
urn:nbn:se:kth:diva-93143 (URN)978-91-7501-328-2 (ISBN)
Disputation
2012-05-04, M311, Brinellvägen 68, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Projekt
DampComatProduction 4 microFFI Robust Machining
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Anmärkning

QC 20120413

Tillgänglig från: 2012-04-13 Skapad: 2012-04-12 Senast uppdaterad: 2013-04-19Bibliografiskt granskad

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World Academy of Science

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Daghini, LorenzoArchenti, Andreas

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Daghini, LorenzoArchenti, AndreasNicolescu, Cornel Mihai
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