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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.

Fulltext ()

Procedia manufacturing 27 (2019), pp.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>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IWU ()
geometrical deviation; inner stress; mechanical press; tolerance

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.