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Making Sustainability Paradigms a Part of PPC

Procedia CIRP 2015年 29卷 209-214页

作者： Matthias Putz Johannes Stoldt Christin Fanghänel Annett Bierer Andreas Schlegel Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany HTWK Leipzig – Faculty of Business Administration Gustav-Freytag-Straße 42a04277 Leipzig Germany

The mounting pressure of the European legislative to improve the sustainability of production operations prompts companies to implement sustainability paradigms into their production planning and control (PPC). First results from an ongoing European project will show how the innovative Resource Networks Methodology can be used to alter the production organisation accordingly. In particular, novel PPC strategies improving the integration of renewable energy sources and other resource efficient technologies by using previously identified levels of flexibility will be presented. These are complemented by an approach for unifying the readiness levels for application (RLA) of similar methodologies. The latter will assist decision making during the development phase and in preparation for industrial implementations.

关键词： Production planning Sustainable development Readiness levels Resource networks

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Integrated Requirements and Systems Modeling in the Mechatronic Development Process

Integrated Requirements and Systems Modeling in the Mechatro...

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International Conference on Developments in eSystems Engineering (DESE)

作者： Christoph Richter Georg Hackenberg Michael F. Zäh Gunther Reinhart Fraunhofer Institute for Machine Tools and Forming Technology Augsburg Germany Software & Systems Engineering Technische Universität München München Germany Institute for Machine Tools and Industrial Management Technische Universität München München Germany

Manufacturing systems continuously increase in complexity due to higher customer expectations regarding their purpose and flexibility of use. In addition, the growing meaning of electronic and software components in manufacturing systems complicates the engineering since the interaction of different disciplines leads to increasing coordination efforts and problems regarding the interfaces between these disciplines. For these reasons, development processes in this context need to be adapted continuously to the present situation. To face these challenges, the suitable handling of arising requirements is one key factor for the success of engineering processes. Therefore, a modeling technique for an integrated requirements and systems modeling in the mechatronic development process is presented in this paper. After a summary of approaches for model-based development and requirements engineering in the context of mechatronic systems, the modeling technique is illustrated on a meta-model level. To demonstrate the feasibility, the proposed approach is applied to a miniaturized packaging machine, which is currently developed at the institute for machine tools and Industrial Management (iwb) of Technische Universit München for benchmarking engineering methods and tools. Excerpts of this application are outlined in this paper as well as the results of a discussion with experts from the machine tools industry regarding the presented modeling approach. Finally, an outlook with respect to possible enhancements of the modeling technique is given.

关键词： Mechatronics Object oriented modeling Unified modeling language Requirements engineering Analytical models Software

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Evaluating mobile machine tool dynamics by substructure synthesis

Evaluating mobile machine tool dynamics by substructure synt...

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WGP Congress 2014

作者： Law, Mohit Rentzsch, Hendrik Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)9783038352457

Mobile machining solutions use autonomous machining units that can be transported to different part locations, making possible easy maintenance and repair of large industrial equipment. Every new part and location results in different boundary conditions for the mobile machine toolpart system, influencing the dynamics of the combined system and necessitating different strategies for part/machine referencing and clamping. To facilitate efficient mutability and modularity in mobile machining solutions, this paper presents a dynamic substructuring strategy that combines the response characteristics of the mobile machine unit with that of two different simulated base models under varying levels of contact stiffness and damping to obtain the synthesized mobile machine tool dynamic response. Numerical verification of the approach is provided. The framework presented can also combine measured response of parts for which models may not be available a priori. Methods presented provide experimental guidelines for establishing strategies for part/machine referencing and planning of machining strategies based on the esaluated dynamics. © (2014) Trans Tech Publications, Switzerland.

关键词： Dynamics

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Self-optimizing Production Systems

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Procedia CIRP 2016年 41卷 417-422页

作者： Eike Permin Felix Bertelsmeier Matthias Blum Jennifer Bützler Sebastian Haag Sinem Kuz Denis Özdemir Sebastian Stemmler Ulrich Thombansen Robert Schmitt Christian Brecher Christopher Schlick Dirk Abel Reinhart Poprawe Peter Loosen Wolfgang Schulz Günther Schuh Fraunhofer Institute for Production Technology (IPT) Steinbachstraße 17 52064 Aachen Germany Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Steinbachstraße 53 52074 Aachen Institute for Industrial Management (FIR) at RWTH Aachen University Campus-Boulevard 55 52074 Aachen Institute of Industrial Engineering and Ergonomics (IAW) of RWTH Aachen Bergdriesch 27 52062 Aachen Institute of Automatic Control (IRT) Steinbachstraße 54 52074 Aachen Fraunhofer Institute for Laser Technology (ILT) Steinbachstraße 15 52074 Aachen Germany Chair for Laser Technology (LLT) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Chair for Technology of Optical Systems (TOS) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Department Nonlinear Dynamics of Laser Processing (NLD) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany

Today's manufacturers are facing numerous challenges such as highly entangled and interconnected supply chains, shortening product lifecycles and growing product complexity. They thus feel the need to adjust and adapt faster on all levels of value creation. Self-optimization as a basic principle appears a promising approach to handle complexity and unforeseen disturbances within supply chains, machines and processes. Therefore it will improve the resilience and competitiveness of manufacturing companies. This paper gives an introduction to the concept of self-optimizing production systems. After a short historical review, the different levels of value creation from supply chain design and management to manufacturing and assembly are analyzed considering their specific demands and needs for self-optimization. Examples from each of these levels are used to illustrate the concept of self-optimization as well as to outline its potential for flexibility and productivity. This paper closes with an outlook on the current scientific work and promising new fields of action.

关键词： Artificial intelligence Optimization Control Management

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Development of Patient-specific Orbital Floor Implants Made of Shape Memory Alloys

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Procedia CIRP 2016年 49卷 143-146页

作者： Ronny Grunert Jürgen Lichtenstein Nicole Preßler Matthias Geßner Christian Rotsch Maximilian Wagner Susanna Posern Friedemann Pabst Welf-Guntram Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 01187 Dresden Germany Universitätsklinikum Leipzig Klinik und Poliklinik für Orthopädie Unfallchirurgie und Plastische Chirurgie Liebigstraße 20 04103 Leipzig Germany Medizinische Hochschule Hannover Klinik und Poliklinik für Mund- Kiefer- und Gesichtschirurgie Carl-Neubergstraße 1 30625 Hannover Germany Krankenhaus Dresden Friedrichstadt Klinik für Hals-Nasen-Ohrenheilkunde Kopf- und Hals-Chirurgie Plastische Operationen Friedrichstraße 41 01067 Dresden Germany

The shape memory alloy NiTi has successfully proved in many areas of medical technology. This paper describes the innovative idea and development of orbital floor implants made of NiTi. Pseudoelastic NiTi has the peculiarity to withstand large mechanical deformations of up to 8% without being plastically deformed, i.e. it returns to its original shape with relief of the strain. This material property can be used to produce flexible, yet stable implants. The NiTi implants can be implanted into the body in compressed form through relatively small approaches. Arriving at the fracture position, they develop self-reliantly in the previously memorized shape. The perioperative trauma is reduced. The treatment of orbital floor fractures is often done surgically by use of implants made of rigid materials such as titanium, which are inserted in the eye socket through an open approach on the lower eyelid. Implants made of a pseudoelastic shape memory alloys can help to reduce the required incision length of the approach. It is even possible to insert the implant in a minimally invasive procedure via endoscopic access routes and to completely avoid open approach. In this paper first design variants of pseudoelastic orbital floor implants are presented and considerations on the manufacturing process are made.

关键词： NiTi orbital floor fracture orbital reconstruction patient-specific implants shape memory alloys

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A pilot trial comparing the tear-out behavior in screw sockets and cemented polyethylene acetabular components – a cadaveric study

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Revue de Chirurgie Orthopedique et Traumatologique 2016年第6期102卷 530-530页

作者： Möbius, R. Schleifenbaum, S. Grunert, R. Löffler, S. Werner, M. Prietzel, T. Hammer, N. Institute of Anatomy University of Leipzig Faculty of Medicine Liebigstraße 13 Leipzig 04103 Germany Department of Orthopedics Trauma Surgery and Plastic Surgery University Hospital of Leipzig Liebigstraße 20 Leipzig 04103 Germany Fraunhofer Institute for Machine Tools and Forming Technology Nöthnitzer Straße 44 Dresden 01187 Germany HELIOS Clinic Blankenhain Germany Department of Anatomy University of Otago Lindo Ferguson Building 270 Great King St Dunedin 9016 New Zealand

Background The removal of well-fixed acetabular components following total hip arthroplasty (THA) is a difficult operation and could be accompanied by the loss of acetabular bone stock. The optimal method for fixation is still under debate. The aim of this pilot study was to compare the tear-out resistance and failure behavior between osseo-integrated and non-integrated screw cups. Furthermore, we examined examined whether there are differences in the properties mentioned between screw sockets and cemented polyethylene cups. Hypothesis Tear-out resistance and related mechanical work required for the tear-out of osseo-integrated screw sockets are higher than in non-integrated screw sockets. Patients and methods Ten human coxal bones from six cadavers with osseo-integrated screw sockets (n = 4), non-integrated (implanted postmortem, n = 3) screw sockets and cemented polyethylene cups (n = 3) were used for tear-out testing. The parameters axial failure load and mechanical work for tear-out were introduced as measures for determining the stability of acetabular components following THA. Results The osseo-integrated screw sockets yielded slightly higher tear-out resistance (1.61 ± 0.26 kN) and related mechanical work compared to the non-integrated screw sockets (1.23 ± 0.39 kN, P = 0.4). The cemented polyethylene cups yielded the lowest tear-out resistance with a failure load of 1.18 ± 0.24 kN. Compared to the screw cups implanted while alive, they also differ on a non-significant level (P = 0.1). Osseous failure patterns differed especially for the screw sockets compared to the cemented polyethylene cups. Discussion Osseo-integration did not greatly influence the tear-out stability in cementless screw sockets following axial loading. Furthermore, the strength of the bone–implant interface of cementless screw sockets appears to be similar to cemented polyethylene cups. However, given the high failure load, high mechanical load and because of the related bone failure

关键词： Acetabular component Acetabular revision Cementless fixation Osseo-integration Screw socket THA

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Tailoring properties of commercially pure titanium by gradation extrusion

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AIP Conference Proceedings 2016年第1期1769卷

作者： Markus Bergmann Anja Rautenstrauch René Selbmann Raoni Barreto de Oliveira Rodrigo Santiago Coelho Dirk Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Technische Universität Chemnitz Institute of Machine Tools and Production Processes IWP Reichenhainer Straße 70 09126 Chemnitz Germany SENAI Cimatec Av. Orlando Gomes 1845 – Piatã 41650-010 – Salvador Brazil

Commercially pure titanium (CP Ti) is of great importance in medical applications due to its attractive properties, such as high biocompatibility, excellent corrosion resistance and relatively low density and suitable stiffness. Compared to the commonly used Ti-6Al-4V alloy, its lower strength has to be increased. The most attractive approach is to subject CP Ti to severe plastic deformation (SPD) processes such as Equal Channel Angular Pressing (ECAP). The resulting decreased grain size in CP Ti yields a significant increase in hardness and strength. Common SPD-processes typically provide a uniform modification of the material. Their material efficiency and productivity are critical and limiting factors. A new approach is to tailor the material properties by using Gradation Extrusion, which produces a distinct gradient in microstructure and strength. The forming process combines a regular impact extrusion process and severe plastic deformation in the lateral area of the material. This efficient process can be integrated easily into forming process chains, for instance for dental implants. This paper presents the forming process and the applied die geometry. The results of numerical simulations are used to illustrate the potential of the process to modify and strengthen the titanium material. Experiments show that the material is successfully processed by gradation extrusion. By characterizing the hardness and its distribution within the formed parts the effects of the process are investigated.

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Multidimensional Analysis of Process Chains Regarding the Resource-efficient Manufacturing of Hybrid Structures

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Procedia CIRP 2015年 26卷 595-600页

作者： C. Fanghänel A. Rautenstrauch C. Symmank J. Katzenberger M. Putz V. Kräusel U. Götze B. Awiszus Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 09126 Chemnitz Germany Technische Universität Chemnitz Professorship for Machine Tools and Forming Technology Reichenhainer Straße 70 09126 Chemnitz Germany Technische Universität Chemnitz Professorship Management Accounting and Control Thüringer Weg 7 09126 Chemnitz Germany Technische Universität Chemnitz Professorship Virtual Production Engineering Reichenhainer Straße 70 09126 Chemnitz Germany

One of the leading topics in the automotive industry as well as in the aircraft and aerospace sector is the use of lightweight structures for weight reduction. For this purpose, hybrid materials, e.g. metal-plastic structures, are of essential importance. Despite the high technological challenge, the manufacturing techniques still provide versatile development potential. Especially the integration of separate production techniques in one single tool opens new possibilities of successfully designing a resource-efficient process chain for hybrid components, suitable for series production. Within the Cluster of Excellence “MERGE Technologies for Multifunctional Lightweight Structures”, a modelling approach for the resource-efficient process design of the manufacturing of hybrid structures, which is based on a multidimensional analysis, will be developed. Besides the technical optimisation, the energy efficiency, the cost-effectiveness, the robustness of process chains as well as the maturity regarding series production will be considered during the entire development process. The paper will present main features of this modelling approach including a proposal for a systematic and structured procedure of a multidimensional analysis.

关键词： cost-effectiveness energy efficiency hybrid components maturity analysis resource-efficient process chain robustness

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A novel tool design strategy for electromagnetic forming

A novel tool design strategy for electromagnetic forming

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WGP Congress 2014

作者： Neugebauer, Reimund Psyk, Verena Scheffler, Christian Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz Germany

ISBN: (纸本)9783038352457

To make the advantages of electromagnetic forming applicable for industrial manufacturing, a three step tool design strategy is suggested. At first, simplified decoupled electromagnetic and structural mechanical simulations are used for creating a preliminary design via a systematic iterative optimization process. The selected design is verified in more accurate coupled simulations. A prototypic realization serves for further optimization, if necessary. The applicability of the approach is proved on the basis of an inductor system for magnetic pulse welding of tubes. © (2014) Trans Tech Publications, Switzerland.

关键词： Metal forming

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Support of Innovation Networks in Manufacturing Industries Through Identification of Sustainable Collaboration Potential and Best-Practice Transfer

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Procedia CIRP 2015年 26卷 185-189页

作者： Holger Kohl Ronald Orth Oliver Riebartsch Mila Galeitzke Jan-Patrick Cap Department Sustainable Corporate Development Institute for Machine Tools and Factory Management Technical University of Berlin Germany Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

The increasing global competition within today's manufacturing industries is confronting organizations with interdisciplinary challenges that require intellectual expertise and innovative technological solutions in various knowledge areas. Research organizations and manufacturing companies can improve their overall performance by bundling expertise in collaborative innovation networks. For this purpose a systematic Benchmarking approach has been developed by fraunhofer IPK to match the competencies and capacities within a pool of organizations in order to facilitate a sustainable cooperation in terms of resources, customers and R&D topics. Furthermore, a KPI-based identification of best performing network-partners allows an initiation of Best-Practice transfers to gain sustainable competitive advantages for the whole network. Based on a methodological approach, the identification of collaboration potentials and Best-Practices is supported by software tools that visualize the results in an understandable and applicable way.

关键词： Benchmarking Collaboration KPIs Best Practice Transfer Innovations Networks Competence and Capacity Matching

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