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Evaluation and Representation of Machine tool Deformations
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
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
2011 (English)In: Journal of Machine Engineering, ISSN 1895-7595, Vol. 11, no 4, 118-129 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a novel test concept for the evaluation of the accuracy of NC machine tools. The evaluation of machine tools deformations is performed by help of a device similar to the double ball bar (DBB) with the difference that an adjustable load generated by the device can be applied between spindle nose and machine tool table. This load eliminates the play existing in machine tool joints, thus reproducing the testing conditions that exist during machining. Collected data are used to plot diagrams displaying characteristic aspects of achine tool performance and a number of key figures such as static stiffness may be etermined. The data can also be used for trend analysis; to predict any accuracy deviations, and further to conduct preventive maintenance instead of emergency calls. The determined static behaviour could also be used to improve digital models for process simulations and compensation of errors that are caused by deflection.

Place, publisher, year, edition, pages
Wroclaw: Editorial Institution of the Wroclaw Board of Scientific Technical Societies Federation NOT , 2011. Vol. 11, no 4, 118-129 p.
Keyword [en]
machine tool, testing, deformation, static stiffness, circular test, loaded double ball bar
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
SRA - Production
Identifiers
URN: urn:nbn:se:kth:diva-105190OAI: oai:DiVA.org:kth-105190DiVA: diva2:570258
Funder
XPRES - Initiative for excellence in production research
Note

QC 20130123

Available from: 2012-11-18 Created: 2012-11-18 Last updated: 2017-03-30Bibliographically approved
In thesis
1. An Analysis of Machining System Capability and Its Link with Machined Component Quality
Open this publication in new window or tab >>An Analysis of Machining System Capability and Its Link with Machined Component Quality
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Machining components out of tolerances is of no use in competitiveproduction. The machining system sets the limitations of dimensionalaccuracy and surface quality of a machined component. The capabilityof the machining system describes these limits in terms of specifiedvalues. This thesis deals with machining system capability analysismainly focused on machine tool static and dynamic stiffness.The influence of stiffness and flexibility on machining systemcapability is analytically and experimentally investigated. Theexperimental work presented in the thesis complies with the theoriesand shows the relation between machine tool capability and theoutcome on the machine component.The concept of capability analysis by elastic linked system andthe currently available tools for such an evaluation is presented anddiscussed. The basis of elastic linked system analysis is the use ofmeasurements under loaded condition. The machine tool is loadedwith a known force creating a test condition closer to real machining,compared to current methods of unloaded machine tools. Twomeasurement tools for elastic linked system capability analysis areexplained in the thesis: Loaded Double Ball Bar and ContactlessExcitation and Response System.The thesis consists of an analytical base and an experimental casestudy on spiral bevel gear face milling. The experiments are discussedand compiled with the given theories.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xiii, 54 p.
Series
Trita-IIP, ISSN 1650-1888 ; 13:03
Keyword
Machining System Capability, Elastic Linked System, Spiral Bevel Gear Face Milling
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
SRA - Production
Identifiers
urn:nbn:se:kth:diva-122144 (URN)978-91-7501-757-0 (ISBN)
Presentation
2013-05-17, Sal M311, Brinellvägen 68, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
XPRES - Initiative for excellence in production research
Note

QC 20130513

Available from: 2013-05-13 Created: 2013-05-13 Last updated: 2013-05-13Bibliographically approved
2. 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

Open Access in DiVA

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Other links

http://www.not.pl/wydawnictwo/abstract_2011_en.html

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Archenti, AndreasÖsterlind, Tomas

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