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8th CIRP Conference of Assembly technology and Systems, CATS 2020

作者： Schaffrath, Robert Jäger, Erik Winkler, Georg Doant, Jan Todtermuschke, Marcel Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz09126 Germany

Compressed air operated industrial equipment has been always an important part of car body production. Advantages of compressed air powered tools are their robust construction, low-cost manufacturing as well as high performances especially forces at a minimum of construction size. Disadvantages are high operating costs, due to pressure losses in case of leakage, high installation costs and intricate cabling especially at highly flexible manufacturing systems. As a result, many automobile manufacturers aiming for a reduction of air powered production tools or even air free automobile manufacturing systems. Against this background a new concept of a vacuum grippers will be presented, which does not need central compressed air supply. Results of the development of suction cups will be shown, which are based on mechanical air displacement inspired by artificial muscles. Furthermore, a control of clusters of new suction cups with artificial intelligence is given. © 2020 Elsevier B.V.. All rights reserved.

关键词： Compressed air

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Improvement of cutting tools using laser-induced periodic surface structures for machining Aluminium alloy Al 6061 T6 17

Improvement of cutting tools using laser-induced periodic su...

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Laser-based Micro- and Nanoprocessing XVII 2023

作者： Baumann, Robert Bouraoui, Yasmine Teicher, Uwe Selbmann, Erik Ihlenfeldt, Steffen Lasagni, Andrés Fabián Institute for Manufacturing Technology Technische Universität Dresden George-Baehr-Str. 3c Dresden01069 Germany Institute of Mechatronic Engineering Technische Universität Dresden Helmholtzstraße 7a Dresden01069 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany

ISBN: (纸本)9781510659230

Improving processes sustainability to address upcoming demands in metal processing industries such as innovative and hard to process materials has become a major topic for many manufacturers. Therefore, new tool material compositions or surface coatings are continuously developed. In this context, surface functionalization of cutting tools is foreseen as a convenient approach for minimizing material losses and thus energy consumption. In this work, laser induced periodic surface structures (LIPSS) are used for manufacturing quasi-periodic line-like patterns on tungsten carbide inserts. The textured tool surfaces show low spatial frequency LIPSS (LSFL) with spatial periods of 500 nm to 600 nm as well as high spatial frequency LIPSS (HSFL) with a spatial period of ~100 nm. Furthermore, the texturing is applied on rake and flank faces of the cutting tools with different offsets to the edge between 0 and 0.2 mm. The wettability analysis reveals a decrease of static contact angles for the used cutting fluid (CIMSTAR) from 38° to 12°, suggesting an improved cooling process during the machining step. In addition, turning experiments under lubricated conditions are carried out on Al 6061 T6 parts to investigate the tribological performance. The used LIPSS-functionalized cutting tools could effectively decrease the main machining forces by 10 %, the feed force by 21 % and the passive force by 9 %. Furthermore, the laser-processed tools generate thinner chips, which leads to a decrease in surface roughness by 31 % of the aluminum work piece. © 2023 SPIE.

关键词： Turning

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Target Costing as an Approach to reduce Costs in closed-loop Agriculture Systems - Application for the Cultivation of Algae in Photobioreactors

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Procedia CIRP 2023年 116卷 372-377页

作者： Maximilian Stange Marc Tieding Gordon Brinitzer Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB Nobelstrasse 12 70569 Stuttgart Germany Institute of Mechatronic Engineering Technische Universität Dresden 01069 Dresden Germany

The rapidly growing world population, the consequences of climate change and conventional agriculture as well as the limited resources of our planet threaten the food supply of humanity, especially with vital proteins. Therefore, innovation of agricultural systems is crucial for global food security and sustainable development. One proposed system is the cultivation of algae in artificially illuminated photobioreactors, which is a promising technology to limit land and water use. To achieve a competitive position between other agricultural systems and to reduce costs in a systematic and proactive approach, we suggest using Target Costing (TC) at an early stage of development. The paper aims to provide an overview of the state of the art in TC of agricultural systems. The authors identify a suitable approach for the economic evaluation of algae cultivation in bioreactors and adapt it specifically for the extraction of proteins. Based on this, different scenarios are discussed how a cost reduction of the existing systems can be achieved. The focus is on the reduction of energy costs, a suitable site selection and the use of side streams and products.

关键词： Sustainable agriculture Energy costs Target costing Algae

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Efficient data acquisition for traceability and analytics

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Procedia CIRP 2024年 122卷 73-78页

作者： Heiner Reinhardt Mahtab Mahdaviasl Bastian Prell Anton Mauersberger Philipp Klimant Jörg Reiff-Stephan Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Technical University of Applied Sciences Wildau Hochschulring 1 15745 Wildau Germany Professorship Virtual Technologies Hochschule Mittweida - University of Applied Sciences Technikumplatz 17 09648 Mittweida Germany Institute of Machine Tools and Control Engineering Technische Universität Dresden 01062 Dresden Germany

Implementing processes for traceability is required in various industries to assure product quality during manufacturing, provide evidence on required processing conditions or facilitate product recalls. Commonly, radio-frequency identification (RFID) or code recognition techniques (e.g. Data Matrix) are applied to track the flow of workpieces through a manufacturing system and link processing data accordingly. Although the analysis of tracking data is well-examined, we still see a gap in the research on the trade-off between data acquisition, data analytics and data quality. Here, we present a framework to increase the value of existing data by enabling data analytics while addressing common pitfalls and reducing the costs of data management.

关键词： Identification Knowledge management Manufacturing system Process control Quality assurance Sustainable development Decision making Complexity Analysis Design

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Apparatus to measure wear of soft tissue induced by reconstruction plates – A preliminary study

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Procedia CIRP 2024年 125卷 290-295页

作者： Anas Ben Achour Allani Mohamed Hedi Uwe Teicher Günter Lauer Christian Bräuer Tom Alexander Schröder Fraunhofer Institute for Machine Tools and Forming Technology IWU 01187 Dresden Germany Oral and Maxillofacial Surgery Faculty of Medicine Carl Gustav Carus TU Dresden 01307 Dresden Germany Department of Oral and Maxillofacial Surgery Facial Plastic Surgery University of Rostock Schillingallee 35 18057 Rostock Germany

Mandibular reconstruction is a complex surgical procedure that aims to restore form and function. This procedure becomes necessary in cases where significant bone loss or defects occur due to medication-related osteonecrosis or severe cases of osteomyelitis, tumor resection, or congenital abnormalities. In the last decades, advancements in surgical techniques, materials, and technologies have greatly improved the outcomes of mandibular reconstruction. Nevertheless, complications such as the subsequent formation of large soft tissue wounds regularly occur after the successful treatment of these bone defects. These wounds occur as a result of the relative movements that naturally happen between the implant and the soft tissue, causing the soft tissue to wear away. However, the factors that promote or delay wear have not yet been conclusively clarified. In this work, a test bench was developed and evaluated to simulate naturally occurring movements between implant materials and soft tissue. Then, this test bench was used to compare the wear behavior of linear titanium plates with the behavior of titanium plates encased with bone cement (Palacos®) in a preliminary study. The friction coefficients for different movement patterns of the two surgical techniques were measured and the wear on the abdominal skin of pigs was examined. The results revealed that encasing the titanium plates with bone cement has advantages in terms of friction coefficients and wear for certain movement patterns.

关键词： Bio-based cooling lubricants tribology friction process forces tool wear

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Force-controlled burnishing process for high surface integrity on additive manufactured parts

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Procedia CIRP 2022年 108卷 642-647页

作者： Martin Dix Marco Posdzich Chemnitz University of Technology Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70. 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88. 09126 Chemnitz Germany

Additive manufactured components provide a new level of shape flexibility. However, this process has shortcomings in surface quality and dimensional accuracy. As a result post-processing is often necessary. In this paper, a combined finishing operation of machining shaping and force-controlled burnishing is used for prismatic form elements. Therefore, a corresponding control strategy was implemented for this on a CNC machine tool. The focus lies on the process characteristics between the pre-machined surface structures and the force-controlled machining and in the resulting surface properties. The aim of the work is the investigation and application of the process combination on additive manufactured metallic structural elements.

关键词： additive manufacturing force control surface modification finishing process combination

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The RaRe2 Attempt as a Holistic Platform for Decision Support in Rapidly Changing Process Chains 9th

The RaRe2 Attempt as a Holistic Platform for Decision Suppor...

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Production Processes and Product Evolution in the Age of Disruption - Proceedings of the 9th Changeable, Agile, Reconfigurable and Virtual Production Conference CARV2023 and the 11th World Mass Customization and Personalization Conference MCPC2023

作者： Teicher, Uwe Ben Achour, Anas Selbmann, Erik Demir, Ozan Emre Arabsolgar, Dena Cassina, Jacopo Ihlenfeldt, Steffen Colledani, Marcello Fraunhofer Institute for Machine Tools and Forming Technology IWU Pforzheimer Straße 7a Dresden01189 Germany Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy Syxis VSI Europos pr. 122 Kaunas46351 Lithuania Institute of Mechatronic Engineering Technische Universität Dresden Dresden01069 Germany

ISBN: (纸本)9783031348204

The trend towards globalization is increasingly being questioned or put under the microscope for social, political, and economic policy reasons. Due to the closely net-worked trade relations unpredictable events like pandemics, natural disasters, technical disruptions of supply chains and political conflicts can have considerable economic and social consequences. However, the central point is the constantly and rapidly changing market conditions to which it is necessary to react, or which must be shaped in order to adequately and successfully counter new technologies or new competitors. Within this paper it is worked out that based on targeted support of decision makers from top management to lower management and of the executing staff, the economic consequences for companies can be lowered with data-driven approaches and furthermore the. The objective of this paper is to help tackling reconfiguration needs via a holistic approach with the human being in the centre. The central hypothesis consists of the fact that with standards and defined methods, data-driven tools such as the digital twin or dedicated software applications for decision support specifically for information-based decisions, it is possible to deal more robustly and resiliently with rapid changes in the business environment. Based on exemplary use cases of automotive and medical technology as well as precision manufacturing of optical components, a holistic ecosystem platform RaRe2 will be developed, which will be disseminated as a reference for innovative software concepts on an industrial scale. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Supply chains

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Energy efficiency and energy flexibility in matrix production systems

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Procedia CIRP 2025年 134卷 945-950页

作者： Marc Münnich Steffen Ihlenfeldt Sebastian Thiede Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Institute of Mechatronic Engineering Technical University Dresden Helmholtzstr. 7a 01069 Dresden Germany Department of Design Production and Management University of Twente De Horst 2 7522 LW Enschede The Netherlands

Competitive and regulatory pressure force companies to produce more flexible and reactive to market demands and also include electrical energy-related considerations in production system planning and operation to reduce energy cost and environmental impact. Matrix production systems are perceived to cope with turbulent market environments but are only investigated from a logistics point of view. Potentials regarding energy efficiency and energy flexibility that arise from the inherent flexible production infrastructure remain unclear. This paper aims to systematically investigate the potential contributions of the flexible production structures and to point out general hypotheses about synergies as well as conflicts for logistics and energy-related target dimensions. These are evaluated in a simulation study based on an industrial use case. Results indicate that there are various control levers to support energy efficiency as well as energy flexibility together with logistics target dimensions in MPS.

关键词： Matrix production Discrete-event simulation Energy efficiency Energy flexibility

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Toward an Efficient Industrial Implementation of W-temper forming for 7xxx Series Al Alloys 13th

Toward an Efficient Industrial Implementation of W-temper Fo...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Trân, Ricardo Kertsch, Lukas Marx, Sebastian Hebbar, Shreyas Psyk, Verena Butz, Alexander Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Fraunhofer Institute for Mechanics of Materials IWM Wöhlerstraße 11 Freiburg79108 Germany

ISBN: (纸本)9783030753801

Manufacturing technologies for parts made from ultra-high-strength 7xxx series aluminum sheet material have been the focus of research in recent years. A promising approach is W-temper forming, where sheet material is cold formed after heat treatment. Conventional heat treatment routes are very time-consuming and inefficient. In this study, a new more efficient and industry-orientated transfer tool concept has been developed. Heating and cooling of the sheets take place in separate contact tempering stages, which allow superior heating and cooling rates in comparison to conventional methods. To analyze the influences of temperature rates and deformation on microstructure and mechanical behavior, thermo-mechanical experiments in a Gleeble simulator were carried out. The results prove the great potential of the transfer tool concept with inline heat treatment for series production. The process-dependent mechanical properties determine a suitable process window for the industrial application of the W-temper forming of the analyzed alloys. © 2021, The Minerals, Metals & Materials Society.

关键词： Industrial research

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Classification and Evaluation of the Integration of Process Mining and Digital Twins: A Roadmap

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Procedia CIRP 2025年 134卷 467-472页

作者： Maxi Grobis Sven Solterbeck Oliver Kempf Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz“ Germany DB Systel GmbH Jürgen-Ponto-Platz 1 60329 Frankfurt a. Main Germany Institute of Mechatronic Engineering Technische Universität Dresden Helmholtzstraße 7a 01069 Dresden Germany

Process mining has established itself as an essential technique for discovering and analyzing business processes by bringing transparency to complex process landscapes. The application of process mining provides a solid foundation for the further development of digital twins - virtual replicas of real systems that are updated in real-time to generate simulations and improve predictions. The combination of process mining with digital twins necessitates an in-depth exploration of the fundamental aspects of this synergy, particularly to delineate the criteria that constitute a digital process twin or an organizational twin. Currently, there are initial research activities and definitions in this area, characterized by significantly divergent approaches. To address this, the authors developed a concept in the form of a roadmap laying the foundations for a future maturity model and utilized the Reference Architecture Model Industry 4.0 (RAMI 4.0) to systematically evaluate the integration and progress of process mining in connection with digital twins and their characteristics.

关键词： Process Mining Digital Twin Maturity Model RAMI 4.0

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