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Exploitation-oriented Manufacturing technology Development

Procedia CIRP 2014年 17卷 680-685页

作者： G. Schuh M. Graw N. Schön Laboratory of Machine Tools and Production Engineering Chair of Production Systems – RWTH Aachen Univerity Aachen 52074 Germany Fraunhofer Institute for Production Technology IPT Department of Technology Management Aachen 52074 Germany

In consideration of the fact that production technologies are resources that can be exploited across various industrial sectors, their current and prospective technological properties are likely to face requirements from different target industries. Because these requirements can diverge extremely between industries, a methodology will be proposed that enables to assess the compatibility of diverging requirements. It aims at composing consistent, cross-industrial clusters of technological requirements that can potentially be met without significantly adapting the key features of the production technology at hand. These clusters are then mapped with the purpose of deriving an optimized technology development path that increases both long-term market security and overall exploitation potential.

关键词： Cross-industry roadmapping manufacturing technology development technology exploitation development requirements technology management.

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Planning and Optimization of Changeable Production Systems by Applying an Integrated System Dynamic and Discrete Event Simulation Approach

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Procedia CIRP 2014年 17卷 386-391页

作者： Florian Albrecht Oliver Kleine Eberhard Abele Institute of Production Management Technology and Machine Tools Otto-Berndt-Strasse 2 64287 Darmstadt Germany Fraunhofer Institute for Systems and Innovation Research ISI Breslauer Strasse 48 76139 Karlsruhe Germany

Today, the planning and optimization of changeable production systems (CPS) has become a top priority item for the strategic management in most industries. Research has already provided a whole bunch of supposedly effective, mainly technical solutions that enhance the changeability of production systems. However, to actually select solutions for CPS, decision-makers do also need tools for their ex-ante evaluation. These are still missing – especially to assess the impact of organizational measures. Further, it appears that decision-makers have difficulties in coping with the dynamic complexity implied by CPS in planning activities. CPS are complex socio-technical systems – both in terms of their structure and their dynamic behavior – and so must be the underlying planning problems. Thus, any planning approach and in particular its related decision support tools must not only fit the dynamic complexity of the planning problem as a formal requirement, but must at the same time foster the decision-maker's understanding of the underlying managerial problem, i.e. it must foster managerial insight. Therefore, this paper aims at closing this gap and proposes an integrated planning approach based on a hybrid Discrete Event Simulation (DES) and System Dynamics (SD) framework. Both simulation methods are interlinked by an integrated planning approach sharing the same conceptual model and a common set of parameters and key performance indicators (KPI). The DES is applied (1) for an in-depth analysis of the effects of any measures to improve the changeability, based on KPIs relevant to the decision-maker, and (2) to verify the major parameters utilized in the SD model. However, the DES can only be applied for a given structural state of the system. Consequently, SD is utilized to investigate its dynamic behavior when it changes from one structural state to the other. The planning approach was successfully applied in an industry context, where it proved its ability to actually l

关键词： Production system design system dynamics simulation discrete event simulation decision support

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Execution of Ramp-up Projects in Day-to-Day Operations through a Quantitative Risk Management Approach

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Procedia CIRP 2014年 20卷 26-31页

作者： Johann Philipp von Cube Robert Schmitt Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 52074 Aachen Germany Laboratory for Machine Tools and Production Engineering WZL RWTH Aachen Steinbachstraße 19 52074 Aachen Germany

An approach to systematically identify and analyse delay risks in ramp-up projects of automotive manufacturers assuring scheduled ramp-up is discussed considering challenges of time-to-volume, increased quantity of ramp-up projects and increased complexity of products. It follows a multi-stage process based on the common risk management process. Within the first stage comprehensive risk identification in a preliminary process of ramp-up projects is conducted. The second stage includes any activities (risk management) to optimise ramp-up process with regards to delay risks. The approach was validated at an automotive manufacturer site within a ramp-up project of a new product. Results of the forecasting risk simulation and reality of open flaws are to a high degree consistent.

关键词： ramp-up management quantitative risk management simulation automotive

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Laser Roughing of PCD

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Physics Procedia 2014年 56卷 1107-1114页

作者： Christian Brecher Michael Emonts Jan-Patrick Hermani Thomas Storms Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 Aachen 52074 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University Steinbachstraße 19 Aachen 52074 Germany

Polycrystalline diamond (PCD) has become an indispensable tool material for efficient machining of various materials. In manufacturing of PCD tools the finishing process in order to obtain the required surface and edge quality is mostly done by grinding. Due to the high hardness and wear resistance of PCD grinding is characterized by low material removal rates and high wear of the grinding wheel. The fraunhofer IPT has developed a novel finishing method for PCD cutting tools, which combines laser processing and grinding. Short pulse laser ablation is used to completely remove a PCD surface layer of about 180 μm. To achieve the required tool quality the remaining 20 μm are removed by subsequent grinding. The obtained results demonstrate that the combination allows reducing the finishing time by more than 50%. Therefore, laser technology has a high potential to make the finishing process more efficient and significantly lower manufacturing costs.

关键词： PCD Cutting Insert Laser Roughing Ablation

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Shape memory polymer based contact faces for flexible car body fixtures 22

Shape memory polymer based contact faces for flexible car bo...

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22nd International Conference on Production Research, ICPR 2013

作者： Keller, C. Drossel, W.-G. Pfeifer, M. Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The paper describes the status of research concerning the flexibilization of contact faces. For an extensive use of systems for flexible car body fixtures it is necessary to develop flexible contact elements to adapt the clamp to diverse part faces. For this different approaches are shown. Especially the approach of using shape-memory material to make contact faces flexible is discussed. Selected experiments were done. This was the first time the shape-memory effect has been shown on voluminous bodies. The material was activated using an induction field via filler. This way of activating voluminous bodies also has been shown for the first time. The usability of shape-memory polymers was demonstrated and the next steps were shown.

关键词： Railroad cars

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Laser-assisted Metal Spinning of Challenging Materials

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Procedia Engineering 2014年 81卷 2385-2390页

作者： Fritz Klocke Christoph Martin Brummer Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Steinbachstraße 19 52056 Aachen Germany Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 52074 Aachen Germany

A new laser integration into a spinning machine was developed offering the flexibility to apply completely new processing strategies for laser-assisted multi-pass metal spinning. In this process the formability of challenging materials is improved by selective heating of the forming zone by means of laser. In order to decrease the strength and increase the formability of titanium (grade 2) experimental investigations have been performed to generate a suitable temperature field in the workpiece.

关键词： forming technology Metal spinning Laser-assistance Hybrid processing Challenging materials

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Structure-borne sound source and transfer path analysis of coupled structures using the example of a railway air conditioning unit

Structure-borne sound source and transfer path analysis of c...

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42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013

作者： Knöfel, Björn Troge, Jan Drossel, Welf-Guntram Kunze, Holger Linke, Moritz Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

ISBN: (纸本)9781632662675

Within a research project at the fraunhofer institute for machine tools and forming technology IWU, vibration description methods are applied using the example of an air conditioning unit (AC unit) from a railway vehicle. The AC unit consists of several components, where usually the compressors and fans contribute most to the radiated sound power resp. to the transmitted structure-borne sound into the vehicle. In a first step, forces F and accelerations a under steady-state conditions were measured on each of the six mounting brackets of the air conditioning unit. Afterwards, all of the dominant vibration sources of the unit were investigated individually concerning their contribution at each of their contact points. Finally, knowing the mobilities Y of the contact points between sources and unit enables detailed analysis of the system itself. Moreover, it also indicates "weak points" which have to be avoided according to an improved vibrational behavior of the complete air conditioning unit.

关键词： machine tools

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Cutting Edge Preparation of Micro Milling tools

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Procedia CIRP 2014年 14卷 349-354页

作者： E. Uhlmann D. Oberschmidt Y. Kuche A. Löwenstein Institute for Machine Tools and Factory Management Technische Universität Berlin Pascalstraße 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology (IPK) Pascalstraße 8-9 10587 Berlin Germany

Micro milling is commonly used industrially for the production of precision components. Premature tool wear is usually the reason for a short tool life of cemented carbide end mills. An approach to improve the tool wear behavior is the defined cutting edge preparation. In this contribution, experimental investigations on the formation of cutting edge geometry during immersed tumbling of micro milling tools are presented and discussed. It could be shown that it is possible to prepare end mills with a diameter D = 1 mm and to generate edge radii of 4.0 μm ≤ rβ ≤ 31.2 μm. Investigations about the correlations between the cutting edge geometry and the tool wear behavior in micro milling operations showed decreased flank and crater wear as a result of an appropriate cutting edge preparation.

关键词： Immersed Tumbling Micro Milling Cutting Edge Geometry

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The knowledge exchange: A platform for pooling technology intelligence knowledge between practitioners, researchers, and technologists

The knowledge exchange: A platform for pooling technology in...

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IEEE International Conference on Management of Innovation and technology, ICMIT

作者： Guenther Schuh Patrick Kabasci Susanne Aghassi Toni Drescher Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University Aachen Germany Department of Technology Management Fraunhofer Institute for Production Technology IPT Aachen Germany KEX Knowledge Exchange AG Aachen Germany

Leveraging technological knowledge to drive one's own technological and business decisions requires extensive but carefully planned networking. Furthermore, to efficiently assess huge amounts of available information for such decisions, automated methods for data analysis are gaining importance. To research effective software support systems in technology intelligence, we established a platform for technology information research, management, automation and collaboration. This platform is used to research method combinations and partnership models. In this paper, we present the system architecture and cooperation structure, and a case study of the platform's use. We elaborate design and methodology decisions, give a general overview of the technologies employed, and name future research activities.

关键词： Artificial intelligence Collaboration Software Companies Context Knowledge management technology management

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Industrial Applications of Shape Memory Alloys - Potentials and Limitations

Industrial Applications of Shape Memory Alloys - Potentials ...

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GMM/ETG-Fachtagung Innovative Klein- und Mikroantriebstechnik

作者： Andre Bucht Kenny Pagel Christoph Eppler Holger Kunze Fraunhofer Institute of Machine Tools and Forming Technology

ISBN: (纸本)9783800735372

Shape Memory Alloys are well known and established in medical engineering. In recent years their importance considering industrial applications also increased. Especially the high specific work load of the material and the simple working principle of SMA actuator systems possess them to be a suitable alternative to conventional drives. The benefits of the technology directly address the main demands on actuator technologies like miniaturisation, lightweight design and costs. Further SMAs can be an alternative to substitute rare earth metals. In the paper we present the status quo of SMA technology. The shape memory effect as a basis for understanding the working principles of such actuators is described. Beyond that mechanical design rules are explained. That covers the three possible actuating principles constant- and spring loaded and antagonistically arranged SMA actuators. Besides simple switching applications, there are rather complex controlled SMA actuators using external sensors or inherent resistance feedback. Control principles for both approaches are presented. To show potentials but also the limitations of SMA actuators, applications from different markets with different demands are described. They specify the certain challenges which have to be overcome before a comprehensive market acceptance of SMAs in industrial applications can be expected. The estimated developments in the future will be discussed further.

关键词： Shape memory alloys Industrial applications actuators Stone matrix asphalt operating principles medical engineering Rare Earth Metals shape memory effects

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