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Extending stability limits by designed-in damping
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.ORCID iD: 0000-0003-2511-7267
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.ORCID iD: 0000-0001-9185-4607
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.ORCID iD: 0000-0003-0155-127X
2013 (English)In: Journal of Machine Engineering, ISSN 1895-7595, Vol. 13, no 1, 37-48 p.Article in journal (Refereed) Published
Abstract [en]

With advances in material technology come challenges to productivity. New materials are, in fact, more difficult to machine with regards to tool wear and especially machine tool stability. This paper proposes to extend the stability limits of the machining system by enhancing the structure’s damping capability. The aim of the research work presented here is to introduce a unified concept based on the distribution of damping within the machining system components exploiting the dynamic properties of the existing joints. To maintain a high level of static stiffness, it was chosen to adapt hydrostatic clamping systems to the tools. Damping is designed in the structure via high damping interfaces (HDI), intentionally introduced interfaces where the damping ratio is enhanced by introduction of viscoelastic polymer metal composites between the two metallic surfaces composing the interface. In this paper HDI are introduced at two joints, between tool and turret and between turret and lathe. The tests show that the designed-in damping is effective and allows extending the stability limits of the machining system. The implementation of designed-in damping allows the end user to select the most suitable parameters in terms of productivity avoiding the hassle of tuning the devices, having to acquire a deep knowledge in structural dynamics or having to use additional control systems. In addition to this, the enhanced machine tool system becomes less sensitive to stability issues provoked by difficult-to-machine materials or even fluctuations of the work material properties that might occur in everyday production processes.

Place, publisher, year, edition, pages
Wroclaw: Editorial Institution of the Wroclaw Board of Scientific Technical Societies Federation NOT , 2013. Vol. 13, no 1, 37-48 p.
Keyword [en]
high damping interface, cutting stability, operational dynamic properties, machine tool design
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:kth:diva-120464OAI: oai:DiVA.org:kth-120464DiVA: diva2:615071
Projects
FFI Robust MachiningFFI COMPIT – Capability of Machining Systems and Performance Improvement Technologies
Funder
XPRES - Initiative for excellence in production researchVinnova
Note

QC 20130814

Available from: 2013-04-08 Created: 2013-04-08 Last updated: 2017-03-28Bibliographically approved
In thesis
1. Estimation of Machining System Dynamic Properties - Measurement and Modelling
Open this publication in new window or tab >>Estimation of Machining System Dynamic Properties - Measurement and Modelling
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dynamic characteristics of machining systems are analysed for improved understanding of both structural and process properties. The thesis stresses the use of testing methods under operational like conditions as these are more representative of closed loop systems, such as machining systems, as compared to conventional testing methods.

The test instrument proposed is a contactless excitation and response system, developed for testing of machine tool spindles under load and with rotating spindle. The instrument uses electromagnetic excitation and displacement sensors for analysis of rotating milling tools subject to load. A graphical tool for displaying and analysing rotor displacement was developed in conjunction with this.

A modelling procedure for both off-line and on-line estimation of dynamic properties of mechanical structure and process information is presented. The proposed auto-regressive moving average models enable calculation of operational dynamic parameters and they can be estimated in a recursive manner, thus enabling real-time monitoring. The discrimination between stable and unstable processes, both in turning and milling, was performed by analysing the damping obtained from the operational dynamic parameters.

Place, publisher, year, edition, pages
Stockholm: Kungliga Tekniska högskolan, 2017. 57 p.
Series
TRITA-IIP, ISSN 1650-1888 ; 17-02
Keyword
Machining system, Operational dynamic parameters, Displacement map, Contactless excitation and response system
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
SRA - Production; Production Engineering
Identifiers
urn:nbn:se:kth:diva-204579 (URN)978-91-7729-323-1 (ISBN)
Public defence
2017-04-28, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
VINNOVA
Note

QC 20170330

Available from: 2017-03-30 Created: 2017-03-28 Last updated: 2017-03-30Bibliographically approved

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Daghini, LorenzoArchenti, AndreasÖsterlind, Tomas

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