Efficient quantification of free and forced convection via the decoupling of thermo-mechanical and thermo-fluidic simulations of machine tools

• Autorzy: Glaenzel J. , Ihlenfeldt S. , Naumann C. , Putz M.

Identyfikatory

DOI

10.5604/01.3001.0012.0925

• Języki publikacji: EN

Abstrakty

EN

Thermo-elastic deformations represent one of the main reasons for positioning errors in machine tools. Investigations of the thermo-mechanical behaviour of machine tools, especially during the design phase, rely mainly on thermo-elastic simulations. These require the knowledge of heat sources and sinks and assumptions on the heat dissipation via convection, conduction and radiation. Forced convection such as that caused by moving assemblies has both a large influence on the heat dissipation to the surrounding air. The most accurate way of taking convection into account is via computational fluid dynamics (CFD) simulations. These simulations compute heat transfer coefficients for every finite element on the machine tool surface, which can then be used as boundary conditions for accurate thermo-mechanical simulations. Transient thermo-mechanical simulations with moving assemblies thus require a CFD simulation during each time step, which is very time-consuming. This paper presents an alternative by using characteristic diagrams to interpolate the CFD simulations. The new method uses precomputed thermal coefficients of a small number of load cases as support points to estimate the convection of all relevant load cases (i.e. ambient conditions). It will be explained and demonstrated on a machine tool column.

Słowa kluczowe

EN

thermal effects; simulation; machine tool; environment; positioning error

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2018
• Tom: Vol. 18, No. 2
• Strony: 41--53
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Glaenzel J.

• Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz, Germany

autor

Ihlenfeldt S.

• Dresden University of Technology, Institute of Machine Tools and Control Engineering, Dresden, Germany

autor

Naumann C.

• Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz, Germany

autor

Putz M.

• Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz, Germany

Bibliografia

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• [8] GLÄNZEL J., IHLENFELDT S., NAUMANN C., 2017, Effiziente Quantifizierung der Konvektion durch Entkoppelte Strömungs- und Strukturmechanische Simulation, Beispielhaft am Maschinenständer, 5 Kolloquium SFB/TR96, Chemnitz.
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• [14] GLAENZEL J., IHLENFELDT S., NAUMANN C., PUTZ M., 2017, Optimized Grid Structures for the Characteristic Diagram Based Estimation of Thermo-elastic Tool Center Point Displacements in Machine Tools, Journal of Machine Engineering, 17/3.
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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).