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56th CIRP International Conference on Manufacturing systems, CIRP CMS 2023

作者： Uhlmann, Eckart Polte, Julian Koutrakis, Nikolaos-Stefanos Pyka, Lasse Ider, Müslüm Thomas, Georg Rupprecht, Christian Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany Technische Universität Berlin Pascalstraße 8-9 Berlin10587 Germany

Due to the high number of influences in production applications, quality fluctuation and deviating results in thermal spray applications are a challenging issue in manufacturing processes. This paper presents a concept for an adaptive process control based on different machine learning algorithms that are utilized to correlate input parameters with output results in thermal spray processes. For that purpose, a test environment was developed, incorporating different application scenarios with various input parameters. During the experiments, a series of measurements was performed, that is used to describe and evaluate the process. The extracted data of the conducted experiments are transformed into features and serve as the data input for the development of machine learning models based on various algorithms. These algorithms offer a prediction of the peak position, which describes the deviation of the programmed application spot, thus offering a quality prediction by utilizing solely the input process parameters. This work provides an approach based on the compared algorithms, that can be applied to create an adaptive process control, by adjusting the input parameters during the thermal spray application process. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on Manufacturing systems 2023.

关键词： Machine learning process control quality prediction thermal spray process

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Auto-encoder-based algorithm for the selection of key characteristics for products to reduce inspection efforts

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International Journal of Quality and Reliability Management 2023年第7期40卷 1597-1620页

作者： Greipel, Jonathan S. Frank, Regina M. Huber, Meike Steland, Ansgar Schmitt, Robert H. Department of Model-based Systems Chair of Production Metrology and Quality Management WZL | RWTH Aachen University Aachen Germany Institute of Statistics RWTH Aachen University Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

Purpose: To ensure product quality within a manufacturing process, inspection processes are indispensable. One task of inspection planning is the selection of inspection characteristics. For optimization of costs and benefits, key characteristics can be defined by which the product quality can be checked with sufficient accuracy. The manual selection of key characteristics requires substantial planning effort and becomes uneconomic if many product variants prevail. This paper, therefore, aims to show a method for the efficient determination of key characteristics. design/methodology/approach: The authors present a novel Algorithm for the Selection of Key Characteristics (ASKC) based on an auto-encoder and a risk analysis. Given historical measurement data and tolerances, the algorithm clusters characteristics with redundant information and selects key characteristics based on a risk assessment. The authors compare ASKC with the algorithm Principal Feature Analysis (PFA) using artificial and historical measurement data. Findings: The authors find that ASKC delivers superior results than PFA. Findings show that the algorithms enable the cost-efficient selection of key characteristics while maintaining the informative value of the inspection concerning the quality. Originality/value: This paper fills an identified gap for simplified inspection planning with the method for the efficient selection of key features via ASKC. © 2022, Emerald Publishing Limited.

关键词： Feature selection Inspection planning Key characteristics Machine learning Simulation

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Experimental Investigations of the Mechanical-technological Properties and Fatigue Strength of Stainless Steel Bolting Assemblies 34th

Experimental Investigations of the Mechanical-technological ...

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34th International Ocean and Polar Engineering Conference, ISOPE 2024

作者： Glienke, Ralf Hagemann, Melanie Hanebeck, Robin Schwerdt, Daniela Denkert, Christian Wegener, Fritz Dörre, Maik University of Applied Science Technology Business and Design Wismar Germany Fraunhofer-Institute for Large Structures in Production Engineering IGP Rostock Germany University of Cooperative Education Staatliche Studienakademie Riesa Germany

ISBN: (纸本)9781880653784

Due to their corrosion resistance, bolting assemblies manufactured from stainless steel are becoming more and more important in various applications, such as in offshore structures and machinery. An enhanced level of knowledge based on publications of the last few years offers opportunities of using preloaded bolting assemblies. However, missing design rules and insufficient data basis on the fatigue strength of stainless steel bolting assemblies limit their application. Neither Eurocode 3 for structural engineering nor VDI 2230-1 for mechanical engineering provide sufficient design rules regarding the verification of the fatigue strength of stainless steel bolts. A total of 286 fatigue tests at constant amplitude loading (CAL) up to 107 load cycles were carried out on bolting assemblies made from austenitic, duplex stainless steel and carbon steel in nominal sizesM6 to M20 with strength grades 80 and 100 (8.8/10.9), which are presented in this paper. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Corrosion resistance

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Experimental Investigations of the Preload-time-behaviour of Lockstud systems Enhanced by Finite Element Analysis 34th

Experimental Investigations of the Preload-time-behaviour of...

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34th International Ocean and Polar Engineering Conference, ISOPE 2024

作者： Hagemann, Melanie Schwarz, Mathias Schröder, Markus Blunk, Christoph Glienke, Ralf Schwerdt, Daniela Henkel, Knuth-Michael University of Applied Sciences Technology Business and Design Wismar Germany Fraunhofer-Institute for Large Structures in Production Engineering IGP Rostock Germany Howmet Fastening Systems-Industrial Fastener Division Telford United Kingdom University of Rostock Faculty of Mechanical Engineering and Marine Technology Chair of Joining Technology Rostock Germany

ISBN: (纸本)9781880653784

This article presents current results on the initial preload of Lockstud systems of nominal sizes M12 to M20, property class 8.8 and 10.9 in uncoated black, zinc flake coated and hot-dip galvanised conditions during the assembly process. In addition, it provides design recommendations for the preload as given in accordance with Technical Bulletin DVS/EFB 3435-2. Comprehensive numerical investigations of Lockstud systems have shown validated simulations of the assembly process, including the resulting preload (2D model), the stress concentrations with critical failure locations (3D model) and additionally the slip load of a slip-resistant connection (3D model). © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite element method

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Post-Processing of Additive Manufactured Medical Metal Parts 11

Post-Processing of Additive Manufactured Medical Metal Parts

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11th ASPE-euspen Summer Topical Meeting on Advancing Precision in Additive Manufacturing

作者： Uhlmann, Eckart Polte, Julian Hocke, Toni Al-Sanhani, Ghamdan Lahoda, Christian Institute for Production Systems and Design Technology IPK Technische Universität Berlin Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Berlin Germany

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F5G OpenLab: Enabling Twin Transition through Ubiquitous Fiber Connectivity

F5G OpenLab: Enabling Twin Transition through Ubiquitous Fib...

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International Conference on Transparent Optical Networks

作者： Mihail Balanici Behnam Shariati Pooyan Safari Paul Chojecki Moritz Chemnitz David Przewozny Johannes Karl Fischer Ronald Freund Fraunhofer Institute for Telecommunications Heinrich-Hertz-Institut Berlin Germany Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

The paper introduces a new open laboratory, the F5G OpenLab, which aims at fostering the advancement of fiber-based solutions for everything. F5G OpenLab intends to aid in creating a sustainable and eco-friendly ICT industry and accelerate the digital transformation through autonomous networking solutions that are secure and trustworthy. In particular, the purpose of the F5G OpenLab is to establish an ecosystem for the validation of optical networking solutions that facilitate twin transition, provide a vendor-neutral platform for the assessment of vertical use cases, and enable the development of fiber-based solutions. It provides a platform to verify and unify next-gen networking solutions, access to early hardware and software releases, and unique testing and measurement facilities. Finally, the F5G OpenLab supports the development of blueprints for a green and digital transformation, capitalizing on the benefits of fiber technology for all industry sectors. We present its architecture as well as key features and capabilities. Moreover, we report several proof-of-concept demonstrations focused on industry 4.0 vertical use-cases.

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Explorative Study on Benchmarking Approaches for the Improvement of Corporate Greenhouse Gas Emissions

Explorative Study on Benchmarking Approaches for the Improve...

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technology and Entrepreneurship (ICTE), International Conference on

作者： Felix Budde Florian Kidschun Business Excellence Methods Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

Using traditional benchmarking methods on the environmental impact of enterprises, carbon benchmarking aims to enable organizations to compare their individual carbon footprint with their peers. The insights gathered during that process allows enterprises to identify areas for improvement and make informed decisions about their carbon emissions using best practices from their industry section. This paper presents a systematic study of carbon benchmarking approaches and methodologies for the assessment, performance comparison and improvement of corporate greenhouse gas emissions. In a first step, a series of robust criteria are defined in order to respond to the specific requirements of effective carbon benchmarking, aiming for comparable and reliable results. Secondly, existing frameworks and methodologies for the assessment and performance comparison of greenhouse gas emissions (GHG) are explored through a systematic literature review. In a last step, the approaches identified are compared and evaluated by comparison group and scope. In this context, potential gaps are identified and further need for research in the field of corporate GHG reduction methods and approaches revealed.

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Resistance of Lockbolt systems made from carbon and stainless steel subjected to combined tension and shear loading 34th

Resistance of Lockbolt Systems made from carbon and stainles...

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34th International Ocean and Polar Engineering Conference, ISOPE 2024

作者： Holch, Alexander Glienke, Ralf Dörre, Maik Henkel, Knuth-Michael Fraunhofer Institute for Large Structures in Production Engineering IGP Rostock Germany University of Applied Sciences Technology Business and Design Wismar Germany University of Rostock Department of Mechanical and Naval Engineering Rostock Germany

ISBN: (纸本)9781880653784

The load-bearing behaviour of lockbolt systems is for many load cases comparable to that of bolting assemblies, resulting in adopted and modified design rules. Due to a lack of experimental data on the loadbearing behaviour under combined tension and shear loading, a conservative interaction approach is used for lockbolt systems. In order to close this knowledge gap, extensive experimental studies were carried out for lockbolt systems made from carbon and stainless steel. Tensile test pieces and bolting assemblies made from carbon steel were also investigated for reference. As a result, a new design approach for the interaction verification of lockbolt systems made from carbon steel and stainless steel was developed and verified by statistical evaluation. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Stainless steel

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Analysis of various graphite types for electrical discharge finishing 23

Analysis of various graphite types for electrical discharge ...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, E. Polte, M. Hocke, T. Thißen, K. Bolz, R. Streckenbach, J. Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781998999132

Nowadays graphite and copper are the most used tool electrode materials for electrical discharge machining (EDM). Especially for roughing operations to machine mould inserts made of steel, graphite allows high material removal rates, with high discharge energies and reduced relative tool wear. In addition, graphite is characterized by better machinability compared to copper, which leads to a cost-effective production of complex tool electrode geometries. To take advantage of the machinability and flexibility in producing complex tool electrode geometries, graphite is also used for EDM finishing. However, in EDM finishing, graphite shows still higher material removal rates but is also characterised by significantly higher relative tool wear compared to copper. This relative tool wear is fundamentally dependent on the material properties and the used process parameters. Therefore, this paper presents an approach for using graphite in EDM finishing operations. A parameter study was carried out using five different types of graphite to machine steel components. Within the investigations, different types of graphite with grain sizes in the range of 1.0 μm 11.0 %. Therefore, the experiments showed a great improvement regarding the relative tool wear for graphite. Ten additional graphite types will be used for further investigations to gain a deeper understanding of the tool wear mechanisms. This will enable the reliable and efficient application of graphite as a tool electrode material for EDM finishing. © 2023 Euspen Headquarters.

关键词： Cost effectiveness

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Requirements for the Development of a Performance Management System with Consideration of Unforeseeable Business Process Variants 18th

Requirements for the Development of a Performance Management...

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18th Global Conference on Sustainable Manufacturing, GCSM 2022

作者： Teng, Yu-Min Ay, Sila Iyer, Rishabh Scholz, Julia-Anne Technische Universität Berlin Straße Des 17. Juni 135 Berlin10623 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783031288388

Supply chain issues arising from market turbulences force companies to find new solutions in the short term. Hence, deviations from the ideally designed business processes are inevitable, especially during production planning and control. These deviations result in unforeseen process variants. In addition, process steps of those process variants are often not completely conducted with IT systems and are therefore difficult to trace. Another underlying problem lies in the bias of performance measurement of process variants because each variant aligns with different goals and framework conditions. For these and other reasons, the performance management of process variants presents a challenge. To overcome this challenge, a serious game is being further developed in a research project. The goal is to provide trainings for performance management in a turbulent business environment with the serious game. It simulates the business processes and supply chain issues of a drilling machine manufacturer and serves as a use case for the research presented in this paper. The challenges associated with the performance management of unforeseeable business process variants are derived from the use case. A gap analysis is conducted between the challenges and existing requirements for the development of performance management systems. Based on this, adjustments are proposed to existing requirements and new requirements are being developed. © 2023, The Author(s).

关键词： Serious games

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