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Control of milling process dynamics through a mechatronic tool holder with purposely designed Joint Interface
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0003-0219-1667
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0003-0155-127X
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0002-5960-2159
2015 (English)In: 2015 10th International Symposium on Mechatronics and its Applications (ISMA), Institute of Electrical and Electronics Engineers (IEEE), 2015Conference paper, Published paper (Refereed)
Abstract [en]

Machine tool joints have significant influence on the dynamic characteristics of the machine tool and therefore on the response of the machining system to excitations from the cutting process. In cases of unstable response, generally described as chatter, surface quality of a machined workpiece and tool life deteriorate significantly. This paper presents a novel way of exploiting joints in order to control the dynamic response of the system, by integrating a mechatronic tool holder (Joint Interface Module - JIM) in the machine tool. This system has a purposely designed joint interface with controllable natural characteristics (stiffness and damping). These characteristics are controlled by altering the applied pre-load on the internal joint interface of the tool holder. The preload on the joint interface is controlled by pneumatic means. In doing so, a milling process during which the stability limit was exceeded became stable during the machining process, without alteration of the process parameters.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015.
Keyword [en]
Cutting, Cutting tools, Machine tools, Milling (machining), Dynamic characteristics, Internal joints, Joint interfaces, Machining Process, Machining systems, Milling process, Process parameters, Stiffness and damping
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-191765DOI: 10.1109/ISMA.2015.7373475ISI: 000380519100021Scopus ID: 2-s2.0-84964923554ISBN: 978-1-4673-7797-3 (print)OAI: oai:DiVA.org:kth-191765DiVA: diva2:958085
Conference
10th International Symposium on Mechatronics and its Applications, ISMA 2015; Sharjah; United Arab Emirates; 8 December 2015 through 10 December 2015
Note

QC 20160906

Available from: 2016-09-06 Created: 2016-09-02 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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