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19th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2019

作者： Georgi, Oliver Rentzsch, Hendrik Schoesau, René Edelmann, Jan Meichsner, Gunnar Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9780995775145

Electrochemical machining is a suitable process for micro and precision manufacturing. To overcome several disadvantages like geometrical restrictions of the workpieces due to the uniaxial sinking the paper presents an new approach. The common kinematic is sequential or continuously superimposed by an orbiting movement of the workpiece which is defined as a circular translation. However using conventional machine components limits the orbiting frequency to a maximum of 2 Hz. The paper shows the development and design of a drive unit enabling electrochemical orbiting up to 50 Hz. To reach this goal a unique kinematic concept was carried out including an adaptive unbalance compensation for different workpiece weights and the movable orbiting radius. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Kinematics

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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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Combined laser hardening and laser surface texturing forming tool 1.2379

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Procedia CIRP 2020年 94卷 914-918页

作者： Endalkachew Mekonnen Aragaw Eric Gärtner Andreas Schubert Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09107 Germany Fraunhofer Inistitute for Machine tools and Forming Technology IWU Reichenhainer Str. 88 09126 Germany

This paper deals with the tribological performance of forming tool steel 1.2379. Laser hardening and Laser surface texturing are proposed as processes to improve this tribological performance. Hardening influences the surface hardness and wear resistance. While considering the parameter and the specific material, the correlation between heating power and material property is first modelled using FEM of the heat transfer. Based on the modelling result, the realization is performed by nanosecond laser and analyzed by SEM and by comparing the micro –hardness comparison with a reference value. Then textures are integrated into the hardened surface by picosecond laser ablation while focusing on its suitability for smooth dimples and on the examination by pin-on-disk tests for the effect of incorporating textures on the friction performance. Lower friction coefficients between tool and workpiece improve tool durability and product quality as well.

关键词： Laser Hardening (LH) Laser Surface Texturing (LST) Tribology forming tool 1.2379

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Influence of the stiffness of burnishing tools on process force and surface quality of EN AW-2007 and C45 workpieces

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Procedia Manufacturing 2020年 43卷 635-641页

作者： Rico Stöckmann Marco Posdzich Philipp Klimant Matthias Putz Chemnitz University of Technology Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88 09126 Chemnitz Germany

Burnishing is a highly efficient surface finishing process, which is also more sustainable compared to grinding. Such processed surfaces are characterized by a low roughness and an increased hardness. In recent years, the interest in the process grew due to the steady adoption on flat and free-form surfaces. Especially the latter may benefit from a soft burnishing tool, due to the nearly constant burnishing force and therefore a less strong interaction with geometric imperfections of the free-form surface. In this paper, the influence of the burnishing tool stiffness on the surface features indent, bulge and roughness are shown. Several low and one high stiffness burnishing tool were investigated. As evaluation data, the burnishing force and the finished surface were measured. As shown in this paper, soft tools result in a constant force and can improve surface quality.

关键词： Manufacturing process Surface modification Burnishing

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An investigation of abrasive waterjet machining of cubic boron nitride (CBN) with a softer abrasive material

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Procedia CIRP 2020年 95卷 6-11页

作者： F. Morczinek M. Putz Institute for Machine Tools and Production Processes (IWP) Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools an Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

For an effective machining of high-performance materials, high-strength cutting materials, e.g. cubic boron nitride (CBN), with high resistance to any kind of wear are used. However, these materials must also be able to be machined in order to produce geometric elements such as chip breakers or chip grooves. According to the current state of the art, grinding and laser beam technology are used for this purpose. In this paper, an attempt was made to use the erosive removal mechanism of abrasive water jet technology to cut a harder material with a softer abrasive. Within the framework of a full factorial test plan, the removal rate, the macroscopic kerf geometry on CBN were investigated by means of abrasive water jet machining. It could be proven that it is possible to remove a harder material with a softer abrasive by means of abrasive water jet technology.

关键词： Abrasion Cubic Boron Nitrid (CBN) Hardness Machining Material removal Removal rate Waterjet machining

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Investigation of the influence of surface waviness of aluminium on the burnishing quality of a combined process

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Procedia Manufacturing 2020年 43卷 479-486页

作者： Marco Posdzich Rico Stöckmann Philipp Klimant Matthias Putz Chemnitz University of Technology Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70. 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88. 09126 Chemnitz Germany

Burnishing is an effective chipless finishing process for improving workpiece properties such as: hardness, vibration resistance and surface quality. Recently, the process has been increasingly applied to prismatic workpieces and free-form geometries. Before burnishing can be carried out, a milling process created the shape of the workpiece, especially for free-form surfaces. The application of different milling tools does not only produce different roughnesses, it also creates waviness which can influence the burnishing process. This publication focuses on the relationship between roughness and waviness of the milling process on the following burnishing of ductile workpiece materials. The presented work also considers the different machining directions and tool movements of this process combination. Within the evaluation the interdependence between milling and burnishing parameters are examined and the remaining frequency components of the two processes on the generated surface are compared.

关键词： Manifacturing process Milling Finishing Surface Burnishing

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Determination of surface shape deviation by using force-controlled burnishing

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Procedia CIRP 2020年 93卷 1275-1280页

作者： Marco Posdzich Rico Stöckmann Marco Witt Matthias Putz Chemnitz University of Technology Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70. 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88. 09126 Chemnitz Germany

Burnishing is an effective chipless finishing process to improve the workpiece properties hardness, vibration resistance and surface quality. A force control has been established on a CNC machine tool. This force control allows the scanning of the surface during the finishing process, as part of the quality control. In this paper the realization and optimization of this technology are shown on tool steel. In addition, the measuring accuracy is examined. The aim is not only to substitute the grinding process with burnishing, but also to achieve the desired quality for the first workpiece.

关键词： measurement control micro forming

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The development of a digital twin for machining processes for the application in aerospace industry 53

The development of a digital twin for machining processes fo...

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53rd CIRP Conference on Manufacturing Systems, CMS 2020

作者： Hänel, Albrecht Schnellhardt, Thorben Wenkler, Eric Nestler, Andreas Brosius, Alexander Corinth, Christian Fay, Alexander Ihlenfeldt, Steffen Institute of Manufacturing Technology Technische Universität Dresden Dresden01062 Germany Institute of Mechatronic Engineering Technische Universität Dresden Dresden01062 Germany Institute of Automation Technology Helmut Schmidt University Hamburg22043 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden01187 Germany

This paper describes a method for creating a digital twin based on planning and process data for machining processes by using the example of components in the aerospace industry. This development is based on an information model that combines the properties and relationships of relevant information and data involved in the manufacturing process. This system integrates mathematical (technical-technological) models and algorithms for the determination of process parameters as well as planning-relevant information from the machining process. The technology of the digital twin makes it possible to recognize problems directly in the machining process, e.g. deviations from the planning specifications and to derive targeted measures for quality assurance and optimization of the machining process. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the 53rd CIRP Conference on Manufacturing Systems

关键词： Machining centers

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Manufacturing of glass fibre/PBT-spincom yarns for innovative composite processing 18

Manufacturing of glass fibre/PBT-spincom yarns for innovativ...

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18th European Conference on Composite Materials, ECCM 2018

作者： Scheffler, Christina Hiller, Janett Krüger, Matthias Haase, Rico Weise, Dieter Garray, Didier Spickenheuer, Axel Leibniz-Institut für Polymerforschung Dresden e.V. Dept. Composite Materials Hohe Straße 6 Dresden01069 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dept. Business Unit Car Bodies and Cell Structures Chemnitz Germany SIRRIS Seraing Liège/Wallonia Belgium

ISBN: (纸本)9781510896932

The aim of this work was the development of GF (glass fibre)/ PBT (polybutylene therephthalate) SpinCOM yarns that are commingled online during the spinning process using sizing formulations that enable textile processability as well as high fibre-matrix interaction. Epoxy- and polyurethane-based sizings have been applied and were evaluated by micromechanical (single fibre pull-out test) and macromechanical (transverse tensile test of unidirectional plates) testing. Finally, a material combination was selected to be processed by Tailored Fiber Placement (TFP) to textile preforms with a variable-axial, load adapted fiber design. These preforms were consolidated in a low energy and resource consuming process using novel light and low cost forming tools produced by incremental sheet metal forming (ISF) technology. Finally, a low cost solution for thermal processing even for complex shaped TPC parts is demonstrated by the geometry of a bicycle saddle. © CCM 2020 - 18th European Conference on Composite Materials. All rights reserved.

关键词： Polybutenes

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Comparison of Resistive and Optical Strain Measurement for Early Fracture Detection

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Current Directions in Biomedical Engineering 2020年第3期6卷

作者： Carabello, Alina Neupetsch, Constanze Werner, Michael Rotsch, Christian Drossel, Welf-Guntram Zajonz, Dirk Chemnitz University of Technology Adaptronics and Lightweight Design in Production Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Iwu Chemnitz/ Dresden Germany Zeisigwaldkliniken Bethanien Chemnitz Germany

To increase learning success in surgical training, physical simulators are supplemented by measurement technology to generate and record objective feedback and error detection. An opportunity to detect fractures following hip stem implantation early can be measurement of occurring strains on bone surface. These strains can be determined while using strain gauges, digital image correlation (DIC) or photoelasticity. In this research strain gauges and DIC were compared regarding their suitability as strain measurement tools for use in physical simulators. Therefore a testing method was described to replicate the implantation of a hip stem. Testing devices modelled on a realistic prosthesis were pressed into prepared porcine femora in a two-step procedure with a material testing machine. The local strains occurring on bone surface were determined using an optical measurement system for DIC and strain gauges. The initial fractures in the tested femora are located medial-anterior in most cases (73,6%). With increasing indentation depth of the test device, the strains on bone surface increase. Comparing the local strains determined by DIC and strain gauges consistencies in curves are noticeable. Maximal determined strains before fracturing amount to 0,69% with strain gauges and 0,75% with DIC. In the range of the fracture gap, strain gradients are determined by using DIC. However the detected surfaces are of low quality caused by gaps and motion artefacts. The results show strains on bone surfaces for early fracture detection are measurable with strain gauges and DIC. DIC is assessed as less suitable compared to strain gauges. Furthermore strain gauges have greater level of integration and economic efficiency, so they are preferred the use in surgical training simulators. © 2020 by Walter de Gruyter Berlin/Boston 2020.

关键词： Image correlation

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