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International Conference on Shape Memory and Superelastic Technologies 2019, SMST 2019

作者： Braun, Dennis Weik, David Eisner, Sophia Werner, Michael Fraunhofer Institute for Machine Tools and Forming Technology IWU Department of Medical Engineering Dresden Germany

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Fully coupled wet cylindrical turning simulation using the Finite-Pointset-Method 18

Fully coupled wet cylindrical turning simulation using the F...

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18th CIRP Conference on Modeling of Machining Operations, CMMO 2021

作者： Uhlmann, Eckart Barth, Enrico Quellhorst, Alexander Seifarth, Tobias Kuhnert, Jörg Nabbout, Kaissar Sommerfeld, Martin Department of Machine Tools and Manufacturing Technology Pascalstr. 8-9 Berlin10587 Germany Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Industrial Mathematics ITWM Fraunhofer-Platz 1 Kaiserslautern67663 Germany Otto von Guericke University Magdeburg Institute of Process Engineering Universitaetsplatz 2 Magdeburg39106 Germany

In industrial machining operations, many turning processes are carried out under wet conditions. In contrast, most simulation tools are only suitable for dry cutting processes due to challenges of modeling fluid-structure-interactions (FSI). In this paper, a wet, fully coupled cutting simulation using the Finite-Pointset-Method (FPM) is presented and validated for industrially relevant cylindrical turning. To facilitate the required reduction of the calculation effort, different routines like adaptive numerical discretization are applied. The results indicate different cutting fluid effects like evaporation areas around the chip. © 2021 Elsevier B.V.. All rights reserved.

关键词： Turning

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The Time Synchronization Problem in data-intense Manufacturing

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Procedia CIRP 2022年 107卷 827-832页

作者： Arno Schmetz Tae Hun Lee Daniel Zontar Christian Brecher Fraunhofer Research Institution for Battery Cell Production FFB Mendelstr. 11 Münster 48149 Germany Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 Aachen 52074 Germany Laboratory for Machine Tools WZL RWTH Aachen University Steinbachstr. 19 Aachen 52074 Germany

Modern production systems rely heavily on data from the machines, processes and other sources. The amount and resolution of the data increases continuously allowing complex models like machine Learning models to be trained and applied in production. All analytics and models that rely on the production data implicitly require a suitable data quality. Central level of data generation and acquisition is the machine level where data from machine and sensors are generated and need to be aggregated. In this paper, we define the Time Synchronization Problem that arise from the different data sources and technical properties of computerized systems in manufacturing directly impacting the quality of Time-Series data. Further, we cluster current approaches and discuss their applicability in data-intense manufacturing.

关键词： Smart Manufacturing Industry 4.0 Time Synchronization Data Preprocessing Data Quality

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Unique Device Identification Based Linkage of Hierarchically Accessible Data Domains in Prospective Hospital Data Ecosystems

arXiv

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arXiv 2022年

作者： Kozak, Karol Seidel, André Matvieieva, Nataliia Neupetsch, Constanze Teicher, Uwe Lemme, Gordon Achour, Anas Ben Barth, Martin Ihlenfeldt, Steffen Drossel, Welf-Guntram Technische Universität Dresden Center for Evidence-Based Healthcare Dresden01307 Germany Fraunhofer Institute for Machine Tools Forming Technology IWU Dresden01187 Germany Technische Universität Dresden Dresden01069 Germany Fraunhofer Institute for Ceramic Technologies and Systems Maria-Reiche-Str. 2 Dresden01069 Germany Technische Universität Chemnitz ChemnitzD-09107 Germany

The electronic health record (EHR) targets the systematized collection of patient-specific electronically-stored health data. Currently the EHR is an evolving concept driven by ongoing technical developments and open or unclear legal issues concerning used medical technologies, data integration from other domains and unclear access roles. This paper addresses cross-domain data integration, data fusion and access control using the specific example of a Unique Device Identification (UDI) expanded hip implant. In fact, the integration of technical focus data into the hospital information system (HIS) is discussed and presented based on surgically relevant information. Moreover, the acquisition of social focus databased on mHealth is approached, which also covers data integration and networking with therapeutic intervention or acute diagnostics data. Data integration from heterogeneous domains is covered while using a data ecosystem with hierarchical access based on a shell embedded role model, which includes staggered access scenarios. © 2022, CC BY.

关键词： Cyber Physical System

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Development of monolithic ceramic milling tools for machining graphite 20

Development of monolithic ceramic milling tools for machinin...

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20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Uhlmann, E. Polte, M. Polte, J. Kuche, Y. Hocke, T. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775176

Due to the international competition, continuous increases in productivity, product quality and reduction of production costs are required. Especially, the development of milling tools made of innovative cutting materials and application-specific tool geometries are in focus to overcome these challenges. Besides copper, graphite is the most important electrode material for electrical discharge machining (EDM). The machining of graphite leads to high tool wear due to a strong abrasive effect. Short tool life has a considerable influence on the economic efficiency of manufacturing processes. Currently, for the machining of graphite cost intensive diamond coated carbide tools are applied. In order to reduce machining costs, innovative cutting materials and dedicated manufacturing processes have to be applied. First results show a great potential of ceramics as tool material for machining graphite. The aim of this investigation is the characterisation and identification of novel ceramic cutting materials and the evaluation of an innovative tool micro-geometry especially designed for machining graphite. Therefore, the cutting material properties such as hardness, fracture toughness and wear resistance of four ceramic materials were investigated. Various hardness tests and particle blasting tests were carried out. Based on this investigations to manufacture the ceramic milling tools, a specific and innovative tool micro-geometry with defined angles was used. Thereby, a suitable cutting ceramic was identified, which represents a promising approach for an optimised machining of graphite. Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Graphite

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DEM-simulation of particle behaviour during cutting edge preparation of micro-milling tools by immersed tumbling 20

DEM-simulation of particle behaviour during cutting edge pre...

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20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Uhlmann, E. Polte, M. Polte, J. Kuche, Y. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775176

The micro-milling process is widely used in industry for the manufacturing of complex geometries for a wide range of materials. To increase the tool life and cutting length the cutting edge preparation could be successfully established. Within preliminary investigations the immersed tumbling process was identified as the most promising process for cutting edge preparation of micro-milling tools. The process enables a reproducible cutting edge preparation with constant cutting edge radii as well as low chipping of the cutting edges. For a profound understanding of the preparation process and the process mechanisms further knowledge about the particle interactions with cutting tools as well as the particle flow mechanisms needs to be obtained. Therefore, the process simulation using discrete element methods (DEM) offers the possibility of an improved understanding of the process behaviour. In this investigation simulation studies about the cutting edge preparation of micro-milling tools using the immersed tumbling process will be presented. The DEM with the software ROCKY DEM from the company ESSS, Florianópolis, Brasil, was used and a process model was derived. The investigations show that the software can be successfully used for the visualisation of the immersed tumbling process and the flow mechanisms can be examined more closely. Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Finite difference method

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Knowledge transfer and engineering methods for smart-circular product service systems 31st

Knowledge transfer and engineering methods for smart-circula...

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31st CIRP Design Conference 2021, CIRP Design 2021

作者： Halstenberg, Friedrich Dönmez, Jasmin Mennenga, Mark Herrmann, Christoph Stark, Rainer Fraunhofer Institute for Production Systems and Design Technolog Pascalstr. 8-9 Berlin10587 Germany Institute of Machine Tools and Production Technology Chair of Sustainable Manufacturing and Life Cycle Engineering Technische Universität Braunschweig Langer Kamp 19 b Braunschweig38106 Germany

Smart Product Service Systems (Smart PSS) have the potential to contribute to a Circular Economy (CE), but in the design of these systems engineering teams often lack information and knowledge on CE strategies and processes. Against this background, the authors propose a knowledge transfer system for the design of Smart-circular PSS. The system can be used in the concept phase of the Smart PSS development process and delivers information on CE strategies via a Smart-circular PSS Lifecycle Flowchart (SCPLF) and service archetypes. These strategies can be selected, supplemented and extended according to individual user requirements. The approach was validated using an intelligent street lighting system. This paper summarizes findings from the application and provides insights into potentials and limitations for the design of Smart-circular Smart PSS. © 2021 The Author(s).

关键词： Systems engineering

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Evolutionary optimization of deep-drawing processes on servo screw presses with freely programmable force and motion functions

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Procedia CIRP 2021年 104卷 1482-1487页

作者： Sebastian Kriechenbauer Peter Müller Reinhard Mauermann Welf-Guntram Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 01187 Dresden Germany Technische Universität Chemnitz Institut für Werkzeugmaschinen und Produktionsprozesse Professur Adaptronik und Funktionsleichtbau 09107 Chemnitz Germany

Servo screw presses with freely programmable force and motion functions lead to innovative forming technologies for deep drawing of sheet metals. The advanced application potential of the machine type is mainly based on the accuracy and flexibility. Due to the increase of process parameters in deep-drawing processes with variable force and motion functions, the standards for method planning (consideration of machine properties, parameterization of the movement functions) in comparison to conventional deep-drawing processes increase. The high number of parameters motivates the aim: A systematic design of deep-drawing processes with free force and motion functions on servo presses based on computational science methods. In the context of this publication, the determination of optimal parameters (force and motion functions) for a deep-drawing process with superimposed vibrations on servo screw presses will be investigated. With the help of evolutionary optimization approaches a process-design for a deep-drawing process with superposition of low-frequency oscillations will be carry out. The results of the evolutionary optimization approaches are validated by experiments with cross die part.

关键词： deep-drawing evolutionary process optimization servo screw press machine learning cushion-ram-pulsation variable stroke

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Wear monitoring in fine blanking processes using feature based analysis of acoustic emission signals

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Procedia CIRP 2021年 104卷 164-169页

作者： Martin Unterberg Herman Voigts Ingo Felix Weiser Andreas Feuerhack Daniel Trauth Thomas Bergs Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University 52074 Aachen Germany Fraunhofer Institute for Production Technology IPT 52074 Aachen Germany

Tool wear during fine blanking impairs the quality of the sheared part, which is assessed in regular samples in an industrial environment. This leads to scrap production and low planning reliability due to low wear predictability. A tool condition monitoring based on acoustic emission (AE) data for the prediction of the remaining useful life of the tool would mitigate those effects. In a production series, AE signals were recorded, and the tool wear observed. The AE signals were then preprocessed using feature engineering and visualized using linear and nonlinear dimensionality reduction techniques. These visualizations preserve information about the data structure even in two dimensions and resemble the temporal dependent observed tool wear during fine blanking.

关键词： fine blanking acoustic emission data mining condition monitoring

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Increased efficiency and accuracy in ultra-precision machining through adapted CAM software 20

Increased efficiency and accuracy in ultra-precision machini...

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20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Uhlmann, E. Polte, J. Hein, C. Kuche, Y. Dörr, M. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775176

CAM software is widely used through the last 40 years for a broad field of applications. The networkability of machine tools and the digitally integrated production as an existing trend for the next years and exponentially increasing computing power enable direct data transfer between CAD/CAM software and machine tool. Increments ar Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Nanotechnology

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