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2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023

作者： Thielsch, Juliane Bittner, Florian Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology Iwu Dresden01187 Germany Chemnitz University of Technology Institute for Machine Tools and Production Processes Chemnitz09126 Germany

ISBN: (纸本)9798350338362

Statistical modelling was successfully applied to Laser Powder Bed Fusion (LPBF) of Nd-Fe-B permanent magnets to identify the potential impact of different process parameters and their interactions on resulting magnetic properties. Process models for the magnetic properties coercivity Hc, remanence Jr as well as for the shape of the demagnetization curve are obtained. The model quality for Hc is excellent (R2 = 0.99). The model for Jr only allows a rough statement on the impact of the LPBF process due to a weaker quality of the model (R2 = 0.77). It will not be possible to maximize Hc and Jr of LPBF manufactured Nd-Fe-B magnets at the same time due to their contrary dependencies on different LPBF parameters. We have predicted an optimized parameter set with a resulting high Hc of 816 kA/m and a maximized Jr of 0.65 T. From these properties and the calculated shape of the demagnetization curve we predict a (BH)max of 60.77 kJ/m3 for a magnet processed on a LPBF machine AconityMINI using MQP™-S powder. © 2023 IEEE.

关键词： Permanent magnets

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Human Reliability Study in Manual Clamping of Turning Workpieces 32nd

Human Reliability Study in Manual Clamping of Turning Workpi...

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32nd European Safety and Reliability Conference, ESREL 2022

作者： Brade, Jennifer Rojas, Adrian Albero Engelmann, Max Klimant, Franziska Regel, Joachim Dix, Martin Professorship Production Systems and Processes Institute for Machine Tools and Production Processes Chemnitz University of Technology Germany

ISBN: (纸本)9789811851834

In many cases, technical problems or failures are not the primary causes for workpiece ejection during a turning operation. Often, clamping errors lead to those hazardous incidents. Therefore, one important question is whether the machine operator uses the clamping device correctly to reach the required clamping force. To answer this question, we conducted a between-subject study with 23 qualified machine users, with the available tool as an independent variable (conventional cuck key vs. electronic torque wrench). The task consisted (1) of checking the clamping system for possible errors before use and (2) of clamping a clamping force measuring device and a workpiece, either with a cuck key or an electronic torque wrench. The results show that a conventional chuck key is only suitable to a limited extend for applying a defined clamping force, in comparison with an electronic torque wrench. Consequently, the clamping safety, especially when high clamping forces are required, can be significantly increased by using an electronic torque wrench. Furthermore, the results show that the participants are rarely able to set the required clamping force with a conventional chuck key and are only able to assess their own performance correctly to a limited extent despite many years of professional experience. © 2022 ESREL2022 Organizers. Published by Research Publishing, Singapore.

关键词： Chucks

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Novel Procedure for Determining the Finger Force in Flexion Depending on the Finger Position

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Current Directions in Biomedical Engineering 2022年第2期8卷 384-387页

作者： Carabello, Alina Henkner, Rick Drossel, Welf-Guntram Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz Germany

Introduction: The design and development of a novel dynamic hand orthosis that allows individual and progressive adaptation to the patient’s condition require knowledge about the maximum voluntary contraction forces of the fingers. The following work presents a test setup and procedure for determination of isometric finger contraction forces during flexion depending on various finger positions and finger tasks. Methods: The test setup places hand and fingers in certain positions (position 0: grasping of a plate; position 1-3: circular grasping of cylinders of three different diameters). The force measurement is carried out using pressure sensing: A capacitive force sensor is placed on each fingertip. To perform various finger tasks, the subjects are asked for isometric contraction of defined finger groups and single fingers against the boundary system. For proof of the concept, measurements are performed with six subjects and compared with reference values from the literature. Results: The separated finger force of each finger can be captured during the finger tasks in varying positions. Furthermore, the total finger force of all active fingers can be determined. It is shown that the total finger force during contraction of all fingers (IMRL-task; 78.4 N ± 25.8 N, d2) is higher than during contraction of the index finger (25.8 N ± 3.4 N, d2). Furthermore, the single finger force of the index finger is higher than the index finger activity in IMRL-task. The results also show a tendency for the finger contraction force to increase with increasing flexion. Further investigations may require improvements to the method. In this proof of concept, this potential is revealed and discussed. However, the functionality of the test setup and procedure can be demonstrated. © 2022 The Author(s), published by De Gruyter.

关键词： Force measurement

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Studies on Flow-Forming of Hybrid Components 14th

Studies on Flow-Forming of Hybrid Components

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14th International Conference on Technology of Plasticity, ICTP 2023

作者： Laue, Robert Anger, Clemens Awiszus, Birgit Chemnitz University of Technology Faculty Mechanical Engineering Institute for Machine Tools and Production Processes Professorship Virtual Production Engineering Reichenhainer Str. 70 Chemnitz09126 Germany

ISBN: (纸本)9783031410222

The objective of this paper is to present experimental investigations for the analysis of flow-forming of hybrid components. For this purpose, experiments were first carried out in which a heated hybrid tube made of plastic and aluminum is formed by flow-forming. Initial temperature, roller feed rate and thickness reduction ratio were varied for the investigations. During the process, the temperature and forces were measured. This was followed by measurement of the geometry of the produced components. It has been established, that there is a strong local increase in temperature due to the forming, which is decisive for the process result. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Experimental investigation Flow-forming Hybrid component Incremental forming

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Intelligent dressing for continuous generating grinding with convolutional neural networks and knowledge distillation 17

Intelligent dressing for continuous generating grinding with...

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17th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2023

作者： Boesler, Martin Schumann, Marco Klimant, Philipp Dix, Martin Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany

Continuous generating grinding is a highly productive and precise way to finish hardened gears. However, the dressing of the tool has a huge potential for optimization. Detecting the optimal point to stop the dressing process would save cost and reduce machine downtime. This paper provides a proof of concept of how machine learning models can achieve these goals based on acoustic emission data. Therefore, different ML-Classifiers were trained and compared. Particular emphasis was placed on the robustness of the models. In addition, the trade-off between fast and robust models was examined. © 2024 Elsevier B.V.. All rights reserved.

关键词： Convolutional neural networks

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Intelligent parameter determination and quality control of an injection molding process 17

Intelligent parameter determination and quality control of a...

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17th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2023

作者： Nahvi, Sina Schumann, Marco Dix, Martin Klimant, Philipp Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany

One of the most extensively utilized techniques for material processing is injection molding, which is used to manufacture highly accurate and complex plastic items. In order to produce qualified items and ensure quality of the products, process parameter determination is crucial. We propose and compare two approaches for intelligently determining the parameters and controlling the quality within the injection molding process while aiming towards zero defects. These approaches are combinations of the process model trained using Automated machine Learning (AutoML) with optimization techniques based on Bayesian and genetic algorithms. © 2024 Elsevier B.V.. All rights reserved.

关键词： Injection molding

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Potential of Radar Based Measuring Systems in Hot Forging 18th

Potential of Radar Based Measuring Systems in Hot Forging

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18th Global Conference on Sustainable Manufacturing, GCSM 2022

作者： Bergmann, M. Dix, M. Wallbaum, T. Selbmannn, R. Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Chemnitz09126 Germany

ISBN: (纸本)9783031288388

Hot forging processes and process chains provide components, which meet highest demands due to mechanical properties. A wide range of applications in different industries like oil and gas, automotive and aviation are based on such processes. As those processes are very productive unfavorable process conditions and unnecessary reject or rework are a strong issues and still not solved for industrial scale production. One key challenge is to generate geometrical information of the workpiece. The geometrical characterization of hot forged parts is usually carried out in cold condition resulting in an extensive time delay to processing. Information about the part geometry during processing and right after processing – in hot condition -- is not accessible. An approach to address this are radar based measuring systems. Those systems have specific characteristics like sufficient accuracy and robustness which qualifies them for measuring tasks under rough conditions typically occurring during forging processes. In the paper, different use cases for the application of radar-based measuring systems are identified and analyses based on laboratory scale experiments. © 2023, The Author(s).

关键词： Radar measurement

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Hey TPS I Need Your Assistance - Social Perception of Telepresence Systems During a Collaborative Assembly Task 3

Hey TPS I Need Your Assistance - Social Perception of Telepr...

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3rd IEEE International Conference on Metrology for eXtended Reality, Artificial Intelligence and Neural Engineering, MetroXRAINE 2024

作者： Brade, Jennifer Mandl, Sarah Klimant, Franziska Strobel, Anja Klimant, Philipp Institute for Machine Tools and Production Processes Chemnitz University of Technology Chemnitz Germany Chemnitz University of Technology Chemnitz Germany Mittweida University of Applied Sciences Mittweida Germany

ISBN: (纸本)9798350378009

Remote support in general and via telepresence systems is a time- and resource-saving method. Since telepresence systems are very diverse in terms of their design, the question arises as to whether the design influences the perception of the remote assistant. The cooperative assembly study presented here examines four different looking telepresence systems. The results show that similarly designed systems yield only marginal differences, but a system that is designed to transport additional loads and is thus less anthropomorphic is rated significantly less positive than the other systems, even though the remote assistant was the same in all conditions. This highlights that the design of a telepresence system can influence the social evaluation of the remote assisting person. © 2024 IEEE.

关键词： Economic and social effects

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Innovative actuating process for machining CFRP with force-controlled radial feed movement 33

Innovative actuating process for machining CFRP with force-c...

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33rd CIRP Design Conference

作者： Peter, Marie Sauer, Konstantin Regel, Joachim Dix, Martin Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The use of lightweight materials such as carbon fibre reinforced plastics (CFRP) is increasing due to the demand for rising resource and energy efficiency, especially in the aerospace and automotive industries. Because of the high delamination tendency of these materials and their abrasive impact on the tool, the challenges in machining CFRP lie primarily in the drilling process and thus in the design of the drilling tool. In this paper, an innovative design of a drilling tool for machining CFRP with force-controlled radial feed movement of the cutting edges is presented. The aim of this tool is to create a tool axial force free process that uses a force-controlled radial feed motion, which matches the chip cross-section to the wear condition of the cutting edge. The tool concept is explained based on the functionality of the actuating process. Tests were evaluated with regard to process forces and drilling quality to show that the tool is capable of producing delamination-free bores in a tool axial force free process. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Carbon fiber reinforced plastics

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Operational modal analysis used to identify dynamic behaviour of machine tools during milling 16

Operational modal analysis used to identify dynamic behaviou...

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16th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2022

作者： Berthold, Jan Regel, Joachim Dix, Martin Drossel, Welf-Guntram Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The dynamic behaviour of machine tools during cutting is investigated by Operational Modal Analysis (OMA), which overcomes the disadvantages of the Experimental Modal Analysis (EMA) using excitation methods such as shakers or hammers, not considering effects occurring during operation. The assumptions of OMA such as time-invariance and white noise excitation are difficult to fulfil considering the boundary conditions of a milling process. The results show that feed motions classify the varying dynamic behaviour in the working space and excitation is controlled by modification of the milling conditions. Modal Parameters, identified by OMA, provide process-related results enabling to improve performance. © 2023 Elsevier B.V.. All rights reserved.

关键词： machine tools

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