检索结果-内蒙古大学图书馆

Identifying efficiency and flexibility measures for energy-oriented factory management

Procedia CIRP 2022年 105卷 302-307页

作者： Marc Münnich David Rein Heiner Reinhardt Steffen Ihlenfeldt 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.

关键词： Energy Energy efficiency Flexibility Factory

来源：评论

学校读者我要写书评

暂无评论

Replicative Production of Multifunctional Microfluidic Polymer Films for Biomedical Disposables

引用

Procedia CIRP 2024年 125卷 207-212页

作者： Eric Gärtner Frederic Schell Lukas Nitschke Richard Chukwudi Okafor Christoph Zwahr Claudia Hackl Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Fraunhofer Institute for Material and Beam Science IWS Winterbergstr. 28 01277 Dresden Germany Leibniz Institute of Surface Engineering IOM Permoserstr. 15 04318 Leipzig Germany

Increasing demands on the reproducibility and accuracy of lab-on-a-chip systems in the life science sector require new tools for the molding of polymer films with spatially selectively functionalized surfaces. By applying local micro- and nanostructuring to the molding tools, the aim is to achieve multifunctionality of the polymer films, by setting certain wetting properties. This means that fluid-affecting properties (hydrophobic, hydrophilic) should be possible. To functionalize polymer films, the replication tools were specifically microstructured using laser-based surface functionalization. The periodic micro- and nanostructures were produced with the help of nanosecond pulsed and picosecond pulsed laser systems using Direct Laser Interference Patterning. For this purpose, complex functional microstructures in the range of 0.1 µm to 100 µm were developed based on a bionic approach. The functional properties were transferred in a one-step replicative process using UV-imprinting and were subsequently verified by determining the wetting behavior of the molded microfluidic films and the corresponding laser microstructured replication tools. This publication presents the successfully developed processes and the promising results of this series of experiments.

关键词： laser microstructuring surface functionalization lab-on-a-chip DLIP UV-imprinting

来源：评论

学校读者我要写书评

暂无评论

Definition and Description of Matrix Production Systems

引用

Procedia CIRP 2024年 130卷 1875-1880页

作者： Daniel Ranke Michael Trierweiler Patricia Berkhan Marc Münnich Thomas Bauernhansl Fraunhofer Institute for Manufacturing Engineering and Automation IPA Nobelstr. 12 70569 Stuttgart Germany Institute of Industrial Manufacturing and Management IFF Nobelstr. 12 70569 Stuttgart Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz 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： Matrix Production Framework Definition

来源：评论

学校读者我要写书评

暂无评论

causalgraph: A PYTHON PACKAGE FOR MODELING, PERSISTING AND VISUALIZING CAUSAL GRAPHS EMBEDDED IN KNOWLEDGE GRAPHS

arXiv

引用

arXiv 2023年

作者： Pieper, D. Sven Mehling, D. Carl Willy Hirsch, Dominik Lüke, D. Tobias Ihlenfeldt, D. Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden01187 Germany Technische Universität Dresden Institute of Mechatronic Engineering Dresden01062 Germany

This paper describes a novel Python package, named causalgraph, for modeling and saving causal graphs embedded in knowledge graphs. The package has been designed to provide an interface between causal disciplines such as causal discovery and causal inference. With this package, users can create and save causal graphs and export the generated graphs for use in other graph-based packages. The main advantage of the proposed package is its ability to facilitate the linking of additional information and metadata to causal structures. In addition, the package offers a variety of functions for graph modeling and plotting, such as editing, adding, and deleting nodes and edges. It is also compatible with widely used graph data science libraries such as NetworkX and Tigramite and incorporates a specially developed causalgraph ontology in the background. This paper provides an overview of the package’s main features, functionality, and usage examples, enabling the reader to use the package effectively in practice. © 2023, CC BY.

关键词： Python

来源：评论

学校读者我要写书评

暂无评论

Enhanced No-Code Finger-Gesture-Based Robot Programming: Simultaneous Path and Contour Awareness for Orientation Estimation

Enhanced No-Code Finger-Gesture-Based Robot Programming: Sim...

引用

IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Jayanto Halim Paul Eichler Sebastian Krusche Mohamad Bdiwi Steffen Ihlenfeldt Group Collaborative Robot Systems Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Departement of Production System and Factory Automation Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

The programming of industrial robots necessitates specialized expertise and significant time and effort, particularly for small batch sizes. However, with the increasing demand for agility in production, the solutions used for robot programming have evolved significantly. Intuitive robot programming systems based on diverse concepts have been introduced to facilitate rapid deployment of robot systems. One such approved concept is no-code robot programming with finger-based gesture. In this concept, non-expert users draw a robot path via finger movement, which is subsequently translated into robot programming language to facilitate the corresponding movement. A significant challenge associated with this method is the valid replication of the corresponding robot Tool Center Point (TCP) orientation. Reachability issues, non-compliant hand contortions, and sensor occlusions make it difficult to directly derive the robot’s TCP orientation from the finger’s orientation. This work presents two novel approaches for estimating robot orientation using numerical analysis and point cloud information for finger-based robot programming without requiring prior knowledge. The first approach utilizes numerical analysis to estimate the relative robot orientation based on the geometry of the trajectory. In contrast, the second approach uses point-cloud to derive the robot orientation based on the object contour. Input shaping algorithms are employed and evaluated to reduce the divergence in the orientation estimations. Experiments demonstrate the effectiveness of the proposed approach utilizing a low-cost camera as a cost-efficient alternative to existing no-code programming strategies, potentially accelerating the real-world deployment of robotic applications in industrial environments.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Hem flange bonding: a challenging joining process in automotive body construction 1

引用

International Congress on Vehicles of Tomorrow, 2019

作者： Jesche, Fred Menzel, Sandra Fraunhofer Institute for Machine Tools and Forming Technology Germany

ISBN: (数字)9783658297015

ISBN: (纸本)9783658297008

Hem flange bonding is widely used in the automotive body shop, especially in the manufacturing of hang-on parts such as doors, hoods and tailgates. By combining the hemming and adhesive bonding processes, components can be joined by material fit and form fit. In this way, new properties are integrated into the assembly, such as higher load-bearing capacity and improved resistance to corrosion. However, both processes also influence each other in the joining pro cess and in the further production process chain, which makes the hem flange bonding process really challenging. The paper gives an overview of the state of the art. For this purpose, based on the structure of the bonded hem flange, the requirements and criteria for quality evaluation are described. The common hemming technologies and adhesive ap plication methods as well as the industrial process chain, in which the hemming operation takes place, are presented. Essential correlations between component/process parameters and the quality in the hem flange bonded joint are discussed. fraunhofer iwu has been researching various aspects of hemming and hem flange bonding for many years and supports the industry in the analysis of assemblies and processes. Our aim is to systematically increase the quality and appearance of hem flange bonded assemblies and the robustness of hem flange bonding processes. Two current examples from research practice will provide a brief insight: Hemming adhesive dimensioning: Adhesive application plays a decisive, quality-defining role in the hemming process. At every point of the circumferential hem seam of an assembly, the adhesive quantity and adhesive position have to match the existing geometry precisely. The paper shows how the adhesive dimensioning can be carried out. Current test results on the effect of glass beads in the adhesive layer to ensure a defined adhesive layer thickness are also discussed. Hem testing: A testing device was developed at fraunhofer iwu to carry out qu

关键词： Joining

来源：评论

学校读者我要写书评

暂无评论

Influence of engagement parameters on estimation of tangential cutting force using high-frequency process data of the machine tool 16

Influence of engagement parameters on estimation of tangenti...

引用

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

作者： Rytir, Michal Rönnecke, Jonas Hänel, Albrecht Kolar, Petr Ihlenfeldt, Steffen Czech Technical University in Prague Czech Institute of Informatics Robotics and Cybernetics Department of Industrial Production and Automation Jugoslávských partyzánu 1580/3 Prague160 00 Czech Republic Fraunhofer Institute for Machine Tools and Forming Technology IWU Department of Production Digital Twin Nöthnitzer Straße 44 Dresden Germany Technische Universität Dresden Institute of Mechatronic Engineering Chair of Machine Tools Development and Adaptive Controls Dresden01062 Germany

The machining of high-value products needs advanced quality control to avoid the risk of expensive follow-up operations performed on parts with unacceptable quality. This situation requires the in-process or close to in-process control of the machining operation. The tangential cutting force is a parameter that characterizes the force interaction between the specific workpiece material and the specific tool geometry. This paper presents a method for a tangential cutting force calculation along the given tool path based on processing of the high-frequency data acquired from the machine tool control system with support of the geometric material removal model. The calculated data are compared with the reference dynamometer results. The influence of the variable engagement parameters is demonstrated and discussed from the perspective of the in-process workpiece quality control. © 2023 Elsevier B.V.. All rights reserved.

关键词： machine tools

来源：评论

学校读者我要写书评

暂无评论

Direct laser interference patterning of cemented cutting tools 17

Direct laser interference patterning of cemented cutting too...

引用

Laser-based Micro- and Nanoprocessing XVII 2023

作者： Baumann, Robert Bouraoui, Yasmine Teicher, Uwe Selbmann, Erik Ihlenfeldt, Steffen Lasagni, Andrés Fabián Institute for Manufacturing Technology Technische Universität Dresden George-Baehr-Str. 3c Dresden01069 Germany Institute of Mechatronic Engineering Technische Universität Dresden Helmholtzstraße 7a Dresden01069 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany

ISBN: (纸本)9781510659230

Nowadays, improving processes sustainability has become a major topic for many manufacturers in metal processing industries. Next to the challenging rise of costs of raw material and tools, innovative and hard to process materials enter the market. Here, surface functionalization of cutting tools is devised as a convenient approach for reducing energy consumption as well as material losses. In this work, direct laser interference patterning (DLIP) is used for manufacturing periodic line-like structures with spatial periods of 5.5 µm on tungsten carbide. The texturing is applied on rake-flank faces of the cutting inserts, leading to texture depths up to 1.75 µm by controlling the amount of used laser pulses. Moreover, turning experiments under lubricated conditions carried out on Al 6061 T6 parts with structured and untreated tools are performed to investigate the tribological performance. In result, the used DLIP-functionalized cutting tools could effectively decrease machining forces up to 12 %. This is caused by the corresponding improvement in frictional and improved lubrication behavior at the tool/chip interface. Furthermore, the laser-processed tools generate thinner chips, which leads to a decrease in surface roughness by 31 % of the aluminum work piece. This work thus offers insight into the viability of improving cutting tools by laser surface micro patterning for upcoming innovative materials designed for improving tool wear resistance, energy efficiency and surface quality. © 2023 SPIE.

关键词： Tungsten carbide

来源：评论

学校读者我要写书评

暂无评论

Electrochemical material removal characteristics of a NdFeB permanent magnet 22

Electrochemical material removal characteristics of a NdFeB ...

引用

22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022

作者： Petzold, Tom Martin, André Schubert, Andreas Chemnitz University of Technology Institute for Machine Tools and Production Processes Professorship Micromanufacturing Technology Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9781998999118

Electric motors are used in various fields with an ever-increasing demand. In the electromobility sector as an example, a growth of a few hundred thousand motors per year is stated. In many cases, the rotor magnets for electric drives are produced by sintering. Special drives for two-axes positioning with precise movements require individual geometries of the rotor magnets such as spherical shapes. In this case, post-processing of the usually cylindrical or rectangular block shaped bar magnets is necessary. One common technique for post-processing is electrical discharge machining (EDM), which allows the machinability of hard or brittle materials, but also causes thermal impacts, which influence the magnetic properties of the material in a negative way. To overcome this negative effect it is necessary to re-magnetize the rotor magnets after EDM. Additional measurements of the magnetic field strength are required to ensure correct values. Electrochemical machining (ECM) represents an alternative technique for post-processing of rotor magnets, since it offers the possibility to avoid re-magnetization after the shaping process, because machining temperatures are well below the Curie temperature of most materials. In this study, ECM of a NdFeB permanent-magnetic material is presented. The experiments were carried out according to DIN-SPEC 91399. The material-specific removal characteristics indicate an active dissolution with the chosen machining parameters. Comparative measurements of the magnetic field strength before and after ECM indicate that there is no negative influence of the removal process. The results suggest that ECM with pulsed current and oscillating tool cathode is an applicable technique for shaping rotor magnets. © European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Neodymium alloys

来源：评论

学校读者我要写书评

暂无评论

Subjective hearing sensation of process variations at a milling machine. How reliable will chatter marks be detected? 50

Subjective hearing sensation of process variations at a mill...

引用

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

作者： Trautmann, Florian Knöfel, Björn Drossel, Welf-Guntram Troge, Jan Freund, Markus Penter, Lars Anders, Damian Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Strasse 44 Dresden01087 Germany University of Technology Dresden Dresden01062 Germany

ISBN: (纸本)9781732598652

Intuition enables experienced machine operators to detect production errors and to identify their specific sources. A prominent example in machining are chatter marks caused by machining vibrations. The operators assessment, if the process runs stable or not, is not exclusively based on technical parameters such as rotation frequency, tool diameter, or the number of teeth. Because the human ear is a powerful feature extraction and classification device, this study investigates to what degree the hearing sensation influences the operators decision making. A steel machining process with a design of experiments (DOE)-based variation of process parameters was conducted on a milling machine. Microphone and acceleration sensors recorded machining vibrations and machine operators documented their hearing sensation via survey sheet. In order to obtain the optimal data set for calculating various psychoacoustic characteristics, a principle component analysis was conducted. The subsequent correlation analysis of all sensor data and the operator information suggest that psychoacoustic characteristics such as tonality and loudness are very good indicators of the process quality perceived by the operator. The results support the application of psychoacoustic technology for machine and process monitoring. © INTER-NOISE 2021 .All right reserved.

关键词： Audition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：