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Geometric empirical modelling of forces influenced by the cutting edge microgeometry in orthogonal cutting of unidirectional CFRP

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Procedia CIRP 2021年 102卷 25-30页

作者： Konstantin Sauer Alexander Nowak Joachim Regel Rafael Wertheim Martin Dix Chemnitz University of Technology Professorship Production Systems and Processes Reichenhainer Strasse 70 09126 Chemnitz Germany Chemnitz University of Technology Professorship Machine Elements and Product Development Reichenhainer Strasse 70 09126 Chemnitz Germany Fraunhofer Institue for Machine Tools and Forming Technology Reichenhainer Strasse 88 09126 Chemnitz Germany

In optimising the cutting of carbon fibre reinforced plastics (CFRP), increasing emphasis is placed on the cutting edge microgeometry. A significant challenge lies in understanding the engagement conditions between tool and workpiece, influencing tool wear mechanisms and performance. This paper aims to provide a more in-depth insight into the influence of cutting parameters on process forces when applying ideally rounded cutting edges in orthogonal cutting. A geometric empirical process model is developed for calculating the cutting force and the passive force, considering the cutting edge radius, the uncut chip thickness, and the fibre cutting angle. As a result, the minimum uncut chip thickness was determined, and process forces were calculated.

关键词： composite cutting edge modelling orthogonal cutting

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Does the wall sound different? Variable acoustics in rehearsal rooms using small resonator structures in an acoustic panel 50

Does the wall sound different? Variable acoustics in rehears...

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50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021

作者： Knöfel, Björn van Brummelen, Paula Behrens, Tobias Schirmer, Hartmut Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany Weißensee Kunsthochschule Berlin Bühringstraße 20 Berlin13086 Germany ADA-Acoustics and Media Consultants GmbH Arkonastr. 45-49 Berlin13189 Germany SCHIRMER GmbH Beratende Ingenieure Radeburger Straße 124 Dresden01109 Germany

ISBN: (纸本)9781732598652

As the name already states, multipurpose rooms are often used from various people for different intentions like meetings or musical practicing. One example are musical rehearsal rooms, where the acoustic specifications have to meet the requirements of musicians playing different instrument groups. To meet the desire for variable acoustics in a rehearsal room, musicians often like to adjust the room to there personal preferences, what is mostly done by adjusting the frequency dependent room decay curve (T60). Hence, a variable acoustic panel has been developed which consists of several small adjustable resonator structures. In a closed state, the structure acts like a resonator. Although Helmholtz resonators are mostly used at low frequencies, the acoustic panel can address acoustic resonance absorption in the mid-frequency range between 500 Hz and 1.500 Hz. The paper highlights especially the dimensioning of the resonators and its measurements in an impedance tube, a reverberation cabin and a reverberation room. Finally, the prototype of the acoustic panel has been analysed in different rehearsal rooms where musicians examine the panel and T60 differences between the open and closed state of the panel were measured. © INTER-NOISE 2021 .All right reserved.

关键词： Reverberation

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Development and design of a drive unit enabling electrochemical orbiting with high dynamics 19

Development and design of a drive unit enabling electrochemi...

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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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A simulation-based approach to predict the springback behavior of ultra-high strength spring strips 27th

A simulation-based approach to predict the springback behavi...

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27th Metal forming Conference, MEFORM 2019

作者： Richter, Karsten Reuther, Franz Müller, Roland Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783035714951

One effect of high influence on the dimensional accuracy during bending is springback. It inevitably occurs due to the elastic proportion in the material behavior. The impact is notably high when producing springs made of ultra-high strength spring strips of the steel grade 1.4310 (X10CrNi18-8). The high yield ratio needed to fulfil the functionalities required during application leads to dimensional inaccuracies that have to be compensated during the production process. This paper reports a simulation-based approach to predict the springback behavior of ultra-high strength spring strips with tensile strengths TS = 1500-1800 MPa. Based on the results of advanced material testing and modeling, a detailed investigation was conducted on the numerical prediction of the springback behavior of an exemplary bending process (free bending). This helps obtain deeper knowledge and understanding of the springback phenomenon and achieve suitable strategies for a more efficient industrial design for tools and processes in processing of ultra-high strength spring strips. © 2019 Trans Tech Publications Ltd, Switzerland. All rights reserved.

关键词： Finite element method

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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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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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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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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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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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