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19. Kornfeinung mittels Flachbackenwalzen

Author

Peter Roe, Christopher, primary, Viertel, Lars, additional, Kriwall, Mareile, additional, Hedicke-Claus, Yorck, additional, Stonis, Malte, additional, and Behrens, Bernd-Arno, additional

Published
2023
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20. Contact Temperature Measurements on Hybrid Aluminum–Steel Workpieces in a Cross-Wedge Rolling Process

Author

Merkel, Paulina, Kruse, Jens, Kriwall, Mareile, Behrens, Bernd-Arno, Stonis, Malte, Merkel, Paulina, Kruse, Jens, Kriwall, Mareile, Behrens, Bernd-Arno, and Stonis, Malte

Abstract

The Collaborative Research Center 1153 is investigating a novel process chain for manufacturing high-performance hybrid components. The combination of aluminum and steel can reduce the weight of components and lead to lower fuel consumption. During the welding of aluminum and steel, a brittle intermetallic phase is formed that reduces the service life of the component. After welding, the workpiece is heated inhomogeneously and hot-formed in a cross-wedge rolling process. Since the intermetallic phase grows depending on the temperature during hot forming, temperature control is of great importance. In this paper, the possibility of process-integrated contact temperature measurement with thin-film sensors is investigated. For this purpose, the initial temperature distribution after induction heating of the workpiece is determined. Subsequently, cross-wedge rolling is carried out, and the data of the thin-film sensors are compared to the temperature measurements after heating. It is shown that thin-film sensors inserted into the tool are capable of measuring surface temperatures even at a contact time of 0.041 s. The new process monitoring of the temperature makes it possible to develop a better understanding of the process as well as to further optimize the temperature distribution. In the long term, knowledge of the temperatures in the different materials also makes it possible to derive quality characteristics as well as insights into the causes of possible process errors (e.g., fracture of the joining zone).

Published
2023

31. Ganzheitliche Betrachtung der Ökologie und Logistikleistung von KMU

Author

Kriwall, Mareile, Richter, Johannes, Fehlhaber, Anna Lena, Hannemann, Björn, Langner, Jan, and Stonis, Malte

Subjects
Ökologie, KMU, Logistik
Abstract

Volume 2018, Issue 11, Die CO2-Emission der Logistikbranche und die resultierende Umweltbelastung sind als fortlaufend ansteigend zu konstatieren. Steigende Kosten für Energie und Ressourcen, erhöhte Sensibilität der Kunden, veränderte Gesetzesgrundlagen und der bevorstehende Klimawandel zwingen produzierende Unternehmen zu ökologieorientiertem Umdenken. Die fehlende Kenntnis über Wirkzusammenhänge, quantitative Auswirkungen von Maßnahmen und der Parameterausprägung hindern insbesondere KMU an der Umsetzung. Ein ganzheitliches ökologisch-logistisches Wirkmodell mit softwaretechnischer Umsetzung kann KMU dabei helfen, ihr Potential auszuschöpfen. Anforderungen an das Modell und grundlegende Beziehungen von logistischen Parametern zu ökologischen Zielgrößen werden in dieser Veröffentlichung vorgestellt., The CO2 emissions of the logistics sector and the resulting environmental impact are continuously increasing. Rising costs for energy and resources, increased sensitivity of customers, changed legal bases and the impending climatic change force producing enterprises to ecologically-oriented rethink. The lack of knowledge about interdependencies, quantitative effects of actions and parameter characteristics prevents SMEs from the implementation. A holistic ecological-logistical impact model with software implementation can support SMEs reaching their potential. Requirements for the model and fundamental relationships between logistic parameters and ecological target values are presented in this publication.

Published
2018
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