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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Heinzel, Jonas Jedamski, Rahel Rößler, Maximilian Karpuschewski, Bernhard Epp, Jérémy Dix, Martin Mapex Center For Materials And Processes University Of Bremen Bibliothekstr. 1 Bremen28359 Germany Leibniz Institute For Materials Engineering Iwt Badgasteiner Str. 3 Bremen28359 Germany Fraunhofer Institute For Machine Tools And Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany

In this paper the potential of a reliable characterization of surface and subsurface properties is presented by measurement of process forces for determining the specific grinding power Pc and the micromagnetic Barkhausen noise in cylindrical grinding trials. Therefore different dressing conditions by grinding with conventional wheel with varying process parameters are investigated. It is shown that an identified lower thermal limit in a Pc-t-diagram (contact time t) to prevent tempering zones in the ground surface and subsurface area of case hardened steel is applicable even if the condition of the grinding wheel is intentionally influenced by dressing. Finally a soft sensor concept for the use of the specific grinding power and in perspective also the use of the Barkhausen noise for process control is derived. © 2022 The Authors.

关键词： Grinding (machining)

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Residual stresses in additive manufactured precision cemented carbide parts 22

Residual stresses in additive manufactured precision cemente...

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22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022

作者： Polte, J. Polte, M. Hocke, T. Blankenburg, M. Lahoda, C. Uhlmann, E. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Deutsches Elektronen-Synchrotron DESY Germany

ISBN: (纸本)9781998999118

Due to the good strength properties and high hardness, components made of cemented carbide are used in various industrial sectors as key components, e.g. mould making and matrices. Precision cemented carbide parts are mainly machined by milling and electrical discharge machining (EDM). Nevertheless, long machining times and excessive tool wear are remaining challenges at the state of the art. A promising approach to overcome these challenges is the machining of precise cemented carbide parts using a process chain consisting of near-net-shape laser powder bed fusion (LPBF) and subsequent finishing using a dedicate diamond slide burnishing process. Within previous investigations a geometrical accuracy of ag= 10 µm and a reduction of the surface roughness by Ra = 89 % could be achieved. Within this work plastic deformation induced by the diamond slide burnishing and the effects on the material properties in the surface area were investigated, e.g. residual stresses. For this purpose, the lattice distortion of the metallic cobalt phase was measured by X-ray diffraction using high-energy synchrotron radiation. In addition, the height profile of the residual stresses was also recorded in distances of d = 3 µm to obtain information about the depth effect of the diamond slide burnishing process. Based on the investigations an increase of the residual compressive stresses could be obtained. This shows a particularly positive effect especially for additively manufactured components, as these often show a slight porosity and higher surface roughness as conventional manufactured components. In this way, crack propagation can be prevented and the fatigue strength can be increased. © European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Residual stresses

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Short-cycled factory planning - motivation and existing challenges 57

Short-cycled factory planning - motivation and existing chal...

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18th IFAC Workshop on Time Delay Systems, TDS 2024

作者： Bermpohl, Fabian Schäfer, Simon F. Hohmann, Andrea Daub, Rüdiger Fraunhofer Institute for Casting Composite and Processing Technology IGCV Am Technologiezentrum 10 Augsburg86159 Germany Ingenics Consulting Ladestraße 2 Wolfsburg38442 Germany Institute for Machine Tools and Industrial Management iwb The Technical University of Munich Boltzmannstraße 15 Garching bei München85748 Germany

Factory planning is faced with an increasingly dynamic business environment. Product life cycles are being continuously shortened due to more frequent product, process and technology innovations and, thus, to ensure global competitiveness. Combined with increasing government and social restrictions, factories must be adapted in shorter cycles. Assuming a constant need for adjustments to ensure production under optimal settings, a more frequent factory replanning leads to a decreasing operating time and thus directly impacts the overall efficiency of the factory. This publication analyzes the existing needs and challenges for short-cycled factory planning. To approach this topic, the conditions of the factory must be considered holistically: both planning and operation phases must be taken into account. Therefore, it is illustrated how the combination of the factory operator's individual strategy influences the optimal operation level of a factory over its life cycle. Furthermore, a first characterization of short-cycled factory planning is presented, and potentials for consistency of planning information through the factory life cycle are analyzed. © 2024 The Authors.

关键词： digitization factory planning life cycle short-cycled replanning sustainability

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Incremental Collar forming Process for the Manufacturing of Branched Tubes and Pipes 13th

Incremental Collar Forming Process for the Manufacturing of ...

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

作者： Leonhardt, André de Witt, Peggy Rehm, Matthias Schlegel, Holger Kräusel, Verena Professorship Forming and Joining Institute for Machine Tools and Production Processes Chemnitz University of Technology Chemnitz Germany Professorship Production Systems and Processes Institute for Machine Tools and Production Processes Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9783030753801

Beside the manufacturing of finished parts by Incremental Sheet Metal forming (ISF), final operations within the process chain can also be realized with this technology. The technological capabilities of performing incremental (hole-)flanging operations for sheet metal parts has been investigated in research context. The current topic focusses on the transfer of the incremental forming technology to manufacture tubular parts. An incremental collar forming process was developed where all motions are executed by the forming tool. Due to the fixed position of the workpiece, tubes, as well as pipes can be branched. Stainless steel tubes made of 1.4404 (316L) with an outer diameter of 54 mm and a wall thickness of 1.5 mm were used for experimental evidence of functional capability of the incremental collaring process. The influence of different pre-hole geometries and forming tool shapes on the properties of the collar (e. g. geometrical accuracy, wall thickness) was investigated. © 2021, The Minerals, Metals & Materials Society.

关键词： Tubular steel structures

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Derivation of a Model to Evaluate the Environmental Sustainability Benefits of Traceability Systems in Battery Cell Production

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Procedia CIRP 2025年 134卷 987-992页

作者： Alexander D. Kies Dennis Grunert Robert H. Schmitt Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 52074 Aachen Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH University Campus-Boulevard 30 52074 Aachen Germany

The transition towards sustainably producing batteries has become increasingly vital due to manifold environmental challenges. In this context, traceability systems (TS) in battery cell production (BCP) emerge as a promising solution to enhance environmental sustainability. However, the significant environmental impacts associated with the production of battery cells and the benefits of TS, which have not yet been systematically analyzed, require a thorough evaluation with regard to the benefits of these systems. This paper derives a structured evaluation model tailored to address specific requirements identified through expert interviews and literature analysis. A systematic literature review reveals that current approaches are not able to provide quantified results of the environmental benefits of TS in battery production, lacking a either a focused approach on sustainability metrics, TS as a technology, or BCP as the application area. The proposed model consists of critical components, including production parameters, sustainability targets, and traceability-affected operations, allowing for a nuanced and comprehensive evaluation of potential environmental improvements. By addressing this significant gap in existing research, this work provides insights for both current research activities and industry practices, offering a framework to enhance the sustainability of battery production processes by leveraging the potential of TS.

关键词： Battery cell production sustainability traceability digitalization evaluation

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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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Establishing Sustainable Business Models Through Subscription in machinery and Plant Engineering

Establishing Sustainable Business Models Through Subscriptio...

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Portland International Conference on Management of Engineering and technology (PICMET)

作者： Michael Riesener Alexander Keuper Carsten BoBmann Jonathan Smerz Timm Schulz-Isenbeck Günther Schuh Laboratory for Machine Tools and Production Engineering WZL RWTH Aachen University Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (数字)9781890843458

ISBN: (纸本)9798350369137

Companies in machinery and plant engineering make a significant contribution to global greenhouse gas emissions and the use of raw materials. Therefore, they have decisive poten-tial to make better use of resources, increase efficiency and avoid overproduction with regard to a more sustainable economy. How-ever, sustainability is not necessarily an end in itself for companies and must therefore be motivated by incentives. In addition to po-litical legislation and its mandatory implementation of sustainabil-ity initiatives, there must also be financial incentives for compa-nies. In this way, sustainable companies can be successful in a competitive environment in the long term. By using subscription mod-els, companies can establish a long-term and stronger connection to the products and customers. The resulting longer and more in-tensive use of the utilized resources or the extension of the life cycle through upgrades make a significant contribution to sustainabil-ity. This paper therefore examines the effect of subscription mod-els on the establishment of sustainable business models. On the one hand, interdependencies between subscription models and sus-tainable business models are determined. On the other hand, these interdependencies are analyzed concerning influencing factors for sustainability.

关键词： Adaptation models Biological system modeling Legislation Companies Production Raw materials Manufacturing

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Numerical study on the temperature characteristic of material absorptivity and its significance in high-power laser beam welding 13

Numerical study on the temperature characteristic of materia...

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13th CIRP Conference on Photonic Technologies, LANE 2024

作者： Putra, Stephen Nugraha Meng, Xiangmeng Yang, Fan Bachmann, Marcel Rethmeier, Michael Bundesanstalt for Materialforschung und -Pröfung Unter den Eichen 87 Berlin12205 Germany Technical University Berlin Institute for Machine Tools and Factory Management Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology Pascalstraße 8-9 Berlin10587 Germany

The absorptivity of metallic materials plays an important role in high-power laser beam welding. It affects the amount of absorbed laser power leading to the heating and melting of the surfaces to be joined and is highly dependent on the temperature. Nonetheless, this key characteristic is often ignored in numerical simulations and an empirical parameter determined by trial-And-error approaches is rather implemented to calibrate the results. In the present work, the temperature dependence of laser absorption is included in a three-dimensional multiphase numerical model considering the coupled fluid flow and heat transfer. The calculated laser absorption is determined by the temperature-dependent material properties, laser characteristics, and incident angle of the laser beam. It is found that the temperature dependence of the laser absorption is crucial for accurately determining the keyhole and weld pool geometries, which is validated by experimental measurements using 304 austenitic steel. © 2024 The Authors.

关键词： Laser beam welding

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Derivation of Targets for the Portfolio Planning of a Solution Provider in machinery Engineering

Derivation of Targets for the Portfolio Planning of a Soluti...

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Portland International Conference on Management of Engineering and technology (PICMET)

作者： Michael Riesener Alexander Keuper Carsten Boβmann Günther Schuh Laboratory for Machine Tools and Production Engineering WZL RWTH Aachen University Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (数字)9781890843458

ISBN: (纸本)9798350369137

Companies in the machinery engineering sector are increasingly forced to make a strategic decision to transform from product to solution providers. Increasing competitive pressure from international competitors, fewer technological differentiation options for mechatronic products, increased establishment of software applications and increasingly individualized customer requirements are posing challenges for companies. The transformation into a solution provider is one way to address these challenges. In addition, the transformation promises stable sales in the long term and the opportunity to use the resources utilized longer and more intensively in terms of the circular economy. Accordingly, solution providers are no longer selling products, but rather individualized bundles of products, services and software applications in result-oriented business models. However, companies lack a suitable target system for the planning of the portfolio for this transformation. The target system provides a framework to make decisions about the necessary products, services and software applications in the portfolio as well as the most reasonable composition of portfolio elements for individualized solutions. To this end, this paper derives and describes the corresponding targets and associated target dimensions for planning the portfolio of solution providers.

关键词： Mechatronics Biological system modeling Companies Transforms Software Planning machinery

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Micro-texture dependent temperature distribution of CVD diamond thick film cutting tools during turning of Ti-6Al-4V

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Procedia CIRP 2022年 108卷 483-488页

作者： E. Uhlmann D. Schröter E. Gärtner Technische Universität Berlin Institute for Machine Tools and Factory Management (IWF) Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

Machining titanium alloys such as Ti-6Al-4V results in a high thermomechanical load on cutting tools and consequently short tool lifes. With respect to a necessary reduction of the resulting cutting tool temperatures, ultrashort pulse (USP) laser fabricated micro-textured rake faces offer direct supply of cooling lubricant into the cutting zone and lead to a reduced heat induction. As a result, micro-textured CVD diamond thick film cutting tools are also capable of machining high-performance materials due to reduced contact temperatures. In the scope of the research, the resulting temperature distribution for micro-textured rake faces will be compared under both dry and wet process conditions. Measurements show a reduction of the resulting cutting tool temperatures of Δ ϑt = 27.9 % using micro-textured cutting tools compared to non-textured cutting tools. A validated simulation provides valuable information about the contact temperatures enabling a specific development of the micro-texture geometry. As a result, a reduction of the contact temperature between chip and rake face by Δ ϑ T = 24.7 % was possible.

关键词： diamond tool texture titanium turning temperature laser surface integrity

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