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Screening-based evidence of the impact of geometrical deviations on inner stresses on mechanical presses

Empirischer Nachweis des Einflusses von geometrischen Abweichungen auf den Eigenspannungszustand an mechanischen Pressen
 
: Wagner, Nico; Päßler, T.

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Volltext ()

Procedia manufacturing 27 (2019), S.185-191
ISSN: 2351-9789
Sächsische Fachtagung Umformtechnik (SFU) <25, 2018, Chemnitz>
Internationale Konferenz "Accuracy in Forming Technology" (ICAFT) <6, 2018, Chemnitz>
International Lower Silesia-Saxony Conference on Advanced Metal Forming Processes in Automotive Industry (AutoMetForm) <6, 2018, Chemnitz>
Englisch
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWU ()
geometrical deviation; inner stress; mechanical press; tolerance

Abstract
In recent years various cases of damage analysis have shown an increasing number of overload scenarios resulting in failures of entire press structures. This happens in spite of manufacture-compliant utilization and a correct press design process based on state-of-the-art methods such as FEM simulation. This paper proves the hypothesis that geometrical tolerances, defined clearances and geometrical signs of wear have a significant impact on residual stress of a press, by conducting an empirical sensitivity analysis. The focus is on mechanical presses with four-point leverage actuation as an example for highly over-determined press structures. As proven by FEM simulation, the identified geometrical deviations result in a preload of the press structure, amounting up to 10% of its theoretical sustainable stress. The significant impact of geometrical deviations on the residual stress has been proven successfully for the empirically determined assumption.

: http://publica.fraunhofer.de/dokumente/N-534752.html