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Influence of work material microstructure on vibrations when machining cast Ti-6Al-4V
Department of Materials and Manufacturing Technology, Chalmers University of Technology, 41296, Gothenburg, Sweden, Research and Technology Centre, GKN Aerospace Engine Systems, 46181, Trollhättan, Sweden.
KTH, School of Industrial Engineering and Management (ITM). (Manufacturing and Metrology Systems)
KTH, School of Industrial Engineering and Management (ITM), Production Engineering. (Manufacturing and Metrology Systems)ORCID iD: 0000-0001-9185-4607
Research and Technology Centre, GKN Aerospace Engine Systems, 46181, Trollhättan, Sweden.
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2015 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, 1-15 p.Article in journal (Refereed) Epub ahead of print
Abstract [en]

Titanium alloys are known to produce shear-localized chips during machining, resulting in cyclic variations in cutting forces which in turn could cause severe problems with vibrations. However, at low cutting speeds and feed rates, continuous chips are formed, with an increase in both parameters favoring the transition to shear-localized chips. This transition is affected by work material microstructure, where a coarse microstructure gives anisotropic effects, e.g., when the size of alpha colonies is on the same order of magnitude as the primary cutting zone. The change in chip morphology with an increase in cutting parameters will then be dependent on the orientation of alpha colonies within the cutting zone. The microstructure of work material can show large variations depending on product form, e.g., cast, wrought, or sheet material, thus affecting whether the chip formation is isotropic or anisotropic. Other sources of variations also exist that can be found within the same component, such as segregation of alloying elements and differences in thermo-mechanical history during processing due to geometry. In this study, the interaction between work material microstructure, process parameters, and the machining system’s structural characteristics is studied. The aim is to further increase the knowledge about vibrations during machining of titanium and the role of microstructure and machining system properties. Different microstructures were produced by adding boron to cast Ti-6Al-4V material, where the resulting colony sizes gave both isotropic and anisotropic chip formation within the chosen cutting data range. The machining systems dynamic properties were varied by using different tool overhangs, thereby simulating different configurations of natural frequencies and stiffness. The results show the influence of both microstructure and machining system’s structural characteristics on the dynamic response of the system for different process parameters. This information can be used to increase robustness of machining operations taking into consideration this three-way relationship.

Place, publisher, year, edition, pages
London: Springer, 2015. 1-15 p.
Keyword [en]
Titanium Machining, Vibrations, Process-machine interaction
National Category
Engineering and Technology
Research subject
SRA - Production
URN: urn:nbn:se:kth:diva-174199DOI: 10.1007/s00170-015-7827-2ScopusID: 2-s2.0-84944608518OAI: diva2:858359
XPRES - Initiative for excellence in production research

QP 201510

Available from: 2015-10-02 Created: 2015-10-02 Last updated: 2015-10-05Bibliographically approved

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Archenti, Andreas
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