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27th International Congress on Sound and Vibration, ICSV 2021

作者： Hensel, Eric Bräunig, Jan Troge, Jan Stapf, Tom Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology Dresden Germany

ISBN: (纸本)9788378807995

In several industrial branches, the acoustical behavior of gearboxes plays a major role. In most cases, the transmission's noise is perceived as an annoying sound, the so-called gear whine with narrow-band spectral components. This tonal noise is caused by the gear mesh and is mainly dependent on the number of teeth as well as the corresponding rotational speed. In combination with the frequency-dependent structure-borne and airborne sound transfer paths of the gearbox and its subsequent systems, different speeds may lead to resonant system response due to the variable excitation frequencies. The purpose within the design process of gearboxes is the identification of such critical acoustic load conditions and the deviation of adequate measures to improve the acoustical behavior. As well known from other applications, the frequency based substructuring provides a methodology to evaluate the vibrations of a system consisting of different subsystems represented by frequency-dependent admittance functions. A main advantage of this method is that the single subsystems are independent from the mounting conditions. Within the present paper, the frequency based substructuring approach is used to evaluate the dynamic behavior of a single-stage gearbox with different gear blanks but equal tooth geometries. After a short introduction of the corresponding theory, the application of the frequency based substructuring method on gearbox dynamics is shown. In a next step, the simulation results are compared to experimental data obtained by test bench measurements with two different types of blanks - a reference model with no modifications as well as a gear with a metal foam core to change the stiffness of the gear blank significantly. Finally, the influences of different gear blanks are shown and discussed based on simulation results. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights re

关键词： Metals

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Definition and Description of Matrix Production Systems 57

Definition and Description of Matrix Production Systems

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18th IFAC Workshop on Time Delay Systems, TDS 2024

作者： Ranke, Daniel Trierweiler, Michael Berkhan, Patricia Münnich, Marc Bauernhansl, Thomas Fraunhofer Institute for Manufacturing Engineering and Automation IPA Nobelstr. 12 Stuttgart70569 Germany Institute of Industrial Manufacturing and Management IFF Nobelstr. 12 Stuttgart70569 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

The industry's use of adaptable production systems, such as matrix production, is increasing. However, these systems vary in their specific details. The lack of a unified definition, delimitation, and description hinders comparability and the transfer of lessons learned between different systems. This paper aims to propose a comprehensive definition of matrix production and differentiation between different implementation forms. To achieve this, the paper first examines existing approaches to define and describe production systems and their manifestations. Various frameworks and models have been proposed in the literature, but they often focus on specific aspects of production systems, neglecting the complexity of matrix production. The paper identifies common elements and challenges in defining and describing production systems by analyzing these approaches. A second investigation analyzes various existing descriptions of matrix production from the scientific literature. While some definitions focus on the organizational structure, others emphasize operational aspects. By synthesizing these definitions, the paper proposes a comprehensive definition of matrix production encompassing both dimensions. Furthermore, the paper includes cases of industrial implementations as a third investigation. These cases provide insights into the practical application of matrix production systems across different industries. The paper identifies common characteristics, challenges, and benefits associated with matrix production by analyzing these implementation examples. Finally, all three investigations are combined to create a unified definition and a complementary descriptive model. The proposed framework provides a systematic approach to define and describe matrix production systems. It allows for a better understanding and comparison of different implementations, facilitates the transfer of lessons learned, and promotes the exchange of best practices. This framework will enable r

关键词： Production efficiency

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An assessment method of machine components for usage-based value creation in complex manufacturing systems 56

An assessment method of machine components for usage-based v...

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56th CIRP International Conference on Manufacturing Systems, CIRP CMS 2023

作者： Alaluss, Mohaned Kurth, Robin Mauersberger, Anton Drechsler, Chris Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Institute of Mechatronic Engineering Dresden University of Technology Helmholtzstr. 7a Dresden01069 Germany

Rising demands on manufacturing technologies lead to an increase in the complexity of corresponding machines and systems. This complexity acts as an obstacle to the development and realization of digital, usage-based business models for complex manufacturing systems. Particularly in the case of pay-per-use business models, it is necessary to monitor the actual machine load in operation to minimize the business risk on the operator and supplier side. This complicates the transition towards data-oriented value creation in manufacturing system environment. To overcome this challenge, a novel method to assess machine components regarding their potential to monitor the actual load and usage behavior of the whole manufacturing system is proposed. On this basis, the transparency and therefore confidence in digital, usage-based value creation like pay-per-use business models can be increased. The resulting approach is demonstrated by taking the example of a sheet metal forming press. © 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) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on Manufacturing Systems 2023.

关键词： Decision making Forning Manufacturing Methodology Service

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Identifying efficiency and flexibility measures for energy-oriented factory management 29

Identifying efficiency and flexibility measures for energy-o...

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29th CIRP Conference on Life Cycle Engineering, LCE 2022

作者： Münnich, Marc Rein, David Reinhardt, Heiner Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Institute of Mechatronic Engineering Technische Universität Dresden Dresden Germany

Recent efforts in climate politics increase the ecological pressure of manufacturing companies in terms of intelligent and efficient usage of resources during operations. Rising energy prices lead to further economic pressure. Especially companies with a high share of energy cost on total costs are forced to continuously improve processes regarding the energy usage. Existing guidelines and methodologies are usually concerned with either of the two dimensions energy efficiency (EnEff), or energy flexibility (EnFlex). While EnEff addresses the reduction of the energy consumption for a defined manufacturing output, EnFlex addresses the advantageous shift, increase, and decrease of energy demand. Although both dimensions address the total reduction of cost, they are usually considered separately in literature. Here, we examine both dimensions while focusing on the provision and usage of electric energy due to its manifold conversion and usability opportunities in factory processes. Therefore, we developed an overview of measures of both dimensions as well as their application characteristics within the factory. To identify EnEff and EnFlex measures, a practicable methodology is introduced. This aims to enable especially companies with few experiences in EnEff and EnFlex measure application to improve energy aware operations. We illustrate our examination by means of an industrial application example. © 2022 Elsevier B.V.. All rights reserved.

关键词： Energy efficiency

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Solving a multi-dimensional matching problem for grouping clamping points on car body parts 9

Solving a multi-dimensional matching problem for grouping cl...

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9th CIRP Conference on Assembly technology and Systems, CATS 2022

作者： Oberfichtner, Lena Ahrens, Antje Fritzsche, Rayk Richter-Trummer, Valentin Todtermuschke, Marcel Fraunhofer Institute of Machine Tools and Forming Technologies Reichenhainer Straße 88 Chemnitz09356 Germany

Modern car body production is faced by an increasing number of car models as well as individualizing options, which leads to the need for more adaptable assembly equipment, e.g. grippers and fixtures that can switch between models in a matter of seconds. Based on known clamping positions, automated jigs consisting of several clamps can already adapt to different part geometries. To enable an efficient flexible jig, exactly one clamp must be assigned to each clamping point of each model taking into account different optimization criteria. Therefore, clamping points need to be grouped across all different models in the planning phase. Grouping of clamping points e.g. in order to minimize adaptation time or tooling costs is usually performed manually. In this paper, the grouping optimization problem is formalized, and a mathematical algorithm is introduced to solve this multi-dimensional matching. The envisaged approach uses a greedy algorithm to get an initial solution, which is optimised to a technically feasible solution considering economical aspects. To conclude, a short evaluation of the achieved results - especially in comparison with expert based grouping - is given. © 2022 Elsevier B.V.. All rights reserved.

关键词： Railroad cars

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Effects of abrasive waterjet cutting on surface properties of hardened steel 16

Effects of abrasive waterjet cutting on surface properties o...

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

作者： Redžic, Nermin Kieweg, Philipp Regel, Joachim Dix, Martin Chemnitz University of Technology Institute for Machine Tools and Production Processes Reichenhainer Str. 70 Chemnitz09126 Germany Franke GmbH Obere Bahnstraße 64 Aalen73431 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The importance of cutting hardened materials without influencing their structural properties makes abrasive waterjet machining a favorable choice in certain applications in comparison with other manufacturing technologies. Using this technology, faulty surface structures and errors caused by high thermal loads such as burrs, burns and cracks, can be avoided. In this paper, the results of applying the abrasive waterjet technology for cutting of hardened steel and its advantageous properties in comparison with cut-off grinding will be presented. The influence of process parameters on surface properties and burr formation has been determined by experimental analysis. © 2023 Elsevier B.V.. All rights reserved.

关键词： Grinding (machining)

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

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Procedia CIRP 2024年 126卷 513-518页

作者： Martin Boesler Marco Schumann Philipp Klimant Martin Dix Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz 09126 Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz 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.

关键词： Continuous generating grinding Dressing machine learning Convolutional neural network Distillation

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A survey on smart product-service systems in manufacturing

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Procedia CIRP 2023年 120卷 1504-1509页

作者： Anton Mauersberger Mohaned Alaluss Antonia Beyer Kilian Armin Nölscher Alexander Rauscher Heiner Reinhardt Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

The advancing digitization affects product design and manufacturing. Companies focus on product-service systems (PSS) to improve customer satisfaction and loyalty. However, these PSS become increasingly complex as digital technologies are incorporated and cross-company collaboration and manufacturing is facilitated. In essence, we can observe a transition from conventional PSS to smart PSS, where the opportunities of digitization are effectively utilized and synergies between multiple stakeholders are fostered. Here, we present an analysis and classification of smart PSS considering aspects of business modeling, composition, design, quality and sustainability.

关键词： Smart PSS Smart service Smart technologies Product-service system Remote service Development Innovation management Production Modular design Decision making

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Intelligent parameter determination and quality control of an injection molding process

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Procedia CIRP 2024年 126卷 721-726页

作者： Sina Nahvi Marco Schumann Martin Dix Philipp Klimant Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz 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.

关键词： Injection molding Process parameter determination Quality control Optimization machine Learning

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Dismantling and remanufacturing strategies in the automotive sector

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Procedia CIRP 2024年 122卷 695-700页

作者： Rico Haase Daniele Farioli Rene Selbmann Markus Werner Verena Kräusel Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany Politecnico di Milano Department of Mechanical Engineering 20156 Milan Italy

The contemporary recycling of automobiles takes place on a very baseline material level. In order to fundamentally improve the ecologic footprint of the vehicle, a wider application of remanufacturing strategies is intended. Following different recycling approaches ranging from direct reuse or refurbishment through remanufacturing until repurpose, a well-aimed dismantling followed by manufacturing processes adapted to the post-consumer components is mandatorily required. For use on an industrial scale, environmental efficiency and economic viability must be balanced well. Within the paper, possible remanufacturing technologies and necessary prerequisites such as input data are discussed. For the design of remanufacturing operations, material properties and geometric information are a crucial starting point. Seamless integration of the specific properties is intended to encourage wider utilization of pre-used components and materials. With reference to the well-established process design for metal forming operations, adapted material cards and curvature equivalence values are proposed. The approach is illustrated by a reforming operation, where a brake disc cover is remanufactured from a used car body roof.

关键词： circular economy automotive recycling dismantling remanufacturing secondary raw material pre-used components

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