wbk Institute of Production Science

New Publications

[ 1 ] Veith, M.; Zimmermann, A.; Hillenbrand, J. & Fleischer, J. (2020), "Detektion des Vorspannungsverlusts in Kugelgewindetrieben", wt Werkstattstechnik online, vol. 7, pp. 485-490. [30.11.-1].
The aim of machine tool maintenance is to ensure availability in order to guarantee high product quality and productivity. Knowledge of the wear condition of feed axes involved, especially the ball screw, is therefore of enormous importance. The Guard Plus system, a joint development of August Steinmeyer GmbH and ifm diagnostics GmbH, enables this by detecting the preload loss due to wear. Investigation of the system?s function are presented through wbk Institute of Production Science in the following article.

[ 2 ] Verhaelen, B.; Kehm, F.; Häfner, B. & Lanza, G. (2020), "Reaktion auf Störungen globaler Produktionsanläufe", ZWF Zeitschrift für wirtschaftlichen Fabrikbetrieb, vol. 8, pp. 492-496. https://doi.org/10.3139/104.112377 [30.11.-1].

[ 3 ] Kein Eintrag gefunden.
Currently, the laser powder bed fusion (L-PBF) process cannot offer a reproducible and predefined quality of the processed parts. Recent research on process monitoring focuses strongly on integrated optical measurement technology. Besides optical sensors, acoustic sensors also seem promising. Previous studies have shown the potential of analyzing structure-borne and air-borne acoustic emissions in laser welding. Only a few works evaluate the potential that lies in the usage during the L-PBF process. This work shows how the approach to structure-borne acoustic process monitoring can be elaborated by correlating acoustic signals to statistical values indicating part quality. Density measurements according to Archimedes? principle are used to label the layer-based acoustic data and to measure the quality. The data set is then treated as a classification problem while investigating the applicability of existing artificial neural network algorithms to match acoustic data with density measurements. Furthermore, this work investigates the transferability of the approach to more complex specimens.

[ 4 ] Stampfer, B.; Böttger, D.; Gauder, D.; Zanger, F.; Häfner, B.; Stra?, B.; Wolter, B.; Lanza, G. & Schulze, V. (2020), "Experimental identification of a surface integrity model for turning of AISI4140". Procedia CIRP 87, pp. 83-88.
In this work an experimental study of the turning of AISI4140 is presented. The scope is the understanding of the workpiece microstructure and hardness-depth-profiles which result from different cutting conditions and thus thermomechanical surface loads. The regarded input parameters are the cutting velocity (vc = 100, 300 m/min), feed rate (f = 0.1, 0.3 mm), cutting depth (ap = 0.3, 1.2 mm) and the heat treatment of the workpiece (tempering temperatures 300, 450 and 600?C). The experimental data is interpreted in terms of machining mechanisms and material phenomena, e.g. the generation of white layers, which influence the surface hardness. Hereby the process forces are analyzed as well. The gained knowledge is the prerequisite of a workpiece focused process control.

[ 5 ] Klenk, F.; Gleich, K.; Meister, F.; Haefner, B.; Lanza, G. & , . (2020), "Approach for developing implementation strategies for circular economy in global production networks". Advancing Life Cycle Engineering:?from technological eco-efficiency to technology that supports a world that meets the development goals and the absolute sustainability, eds. Brissaud, D.; Zwolinski, P.; Paris, H. & Riel, A., pp. 127-132.
Due to excess of resource consumption, circular economy (CE) aims to return products to the production life cycle in an economically and ecologically reasonable way. Yet, few approaches focus on the strategic and network level of CE. First, existing approaches regarding the configuration of CE networks and the development of appropriate business models are reviewed. Sec- ond, an approach on how to integrate both aspects is presented. By integrating these aspects, implemen- tation strategies for CE in global production networks shall be developed facilitating strategic decisions. The approach is planned to be demonstrated in a German company supplying the automotive sector.

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