检索结果-内蒙古大学图书馆

12th CIRP Conference on Photonic Technologies, LANE 2022

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

In machining, tool wear is one of the main influence factors for the resulting quality of the product. Several wear mechanisms have to be addressed to prevent unwanted deterioration of the tool integrity. For aluminium alloys, adhesion of the workpiece material on the cutting tool is one of the most challenging wear mechanisms. Engineering surface microtopographies has been proved as a convenient strategy to tackle this issue. Particularly, the direct laser interference patterning (DLIP) technique enables the integration of periodic structures on the micrometer or sub-micrometer scale. In this study the structuring of tungsten carbide with different cobalt content is presented. The interference of two laser beams leads to periodic line-like structures with a spatial period of 5.5 µm. A maximum structure depth of 2.2 µm is reached by controlling the processing parameters. Moreover, the wettability of the structured samples was analyzed by contact angle measurements with selected cooling lubricants, revealing a hydrophilic behavior with a decreased contact angle of 10°. This work gives an insight into the possibilities of structuring tungsten carbide materials with a picosecond laser source in combination with an innovative beam shaping setup from the point of view of an analysis to explore the formation of structured surfaces and their wetting behavior with cooling lubricants. © 2022 The Authors. Published by Elsevier B.V.

关键词： Tungsten carbide

来源：评论

学校读者我要写书评

暂无评论

Screen printing approach for high throughput and flexible adhesive deposition in graphite bipolar plate production

引用

Procedia CIRP 2024年 127卷 74-79页

作者： Arne Wagner Christian Wacker Klaus Dröder TU Braunschweig Institute of Machine Tools and Production Technology Langer Kamp 19B 38106 Braunschweig Germany Fraunhofer Institute for Surface Engineering and Thin Films IST Riedenkamp 2 38108 Braunschweig Germany

The struggle against climate change necessitates innovative technologies for storing and utilizing renewable energy. Hydrogen is considered a promising solution for harnessing renewable energy in a wide range of applications. In addition to its application as a raw material in the steel and the chemical industry, hydrogen can also be utilized as an energy carrier in conjunction with fuel cells (e.g. with Polymer Electrolyte Membrane Fuel Cells PEMFC) for heavy-duty vehicles, emergency power supplies or the maritime sector. To achieve the required electrical voltages for these applications, several hundred cells are assembled to a stack. A crucial component of an individual cell alongside the Membrane Electrode Assembly (MEA) is the Bipolar Plate (BPP), consisting of two bonded Bipolar Half Plates (BPHP). The BPP enables an inflow of reactive media, the cooling of the cell and is also required for the electrical contacting of the stacked cells as well as the overall mechanical stability. According to previous studies, fully bonded BPPs, especially in the flow field, significantly improve both mechanical and electrical properties of the entire stack. The here presented innovative approach for adhesive deposition aims at bonding graphitic BPHPs to BPPs with a high throughput capability while maintaining high flexibility and process stability. The process is based on the conventional screen printing technique, which in this case is performed without a stencil, allowing for a high flexibility regarding the cell geometry. Furthermore, the range of usable adhesives can be expanded with minor adjustments, allowing for not only paste adhesives but also thermally activated powders. With the presented approach, the adhesive volume can be controlled precisely and applied uniformly by selecting a suitable screen. The feasibility of the approach was tested and initial parameter estimations for potential industrial implementation were determined.

关键词： Fuel Cell Graphite Bipolar Plate Screen Printing Reconfigurable High Throughput Bipolar Plate Bonding

来源：评论

学校读者我要写书评

暂无评论

Multi-Objective Lookahead Bayesian Optimization for Process Parameter Optimization in Non-Isothermal Glass Molding

引用

Procedia CIRP 2025年 134卷 366-371页

作者： Hendrik Mende Lukas Jäschke Gustavo Schewinski Dennis Grunert Robert H. Schmitt Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 Aachen 52074 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University Campus-Boulevard 30 Aachen 52074 Germany

The optimization of non-isothermal glass molding (NGM) processes is crucial for attaining precise shape accuracy of optical components. Identifying optimal parameters poses a challenge due to unknown functional relationships and high-dimensional design and target spaces. Traditional design of experiments (DoE) approaches are sample inefficient in this regard. This paper presents a multi-objective lookahead Bayesian optimization framework applied to a use case from NGM, in which a glass gob is formed into a light optic. The approach leverages a multi-target Gaussian Process-based surrogate model. Through novel acquisition functions, the framework adeptly balances exploration and exploitation, resulting in a significant reduction of samples necessary. Improved peak-to-valley values for the glass optics demonstrate the improvement of the product quality with regard to the application of the approach. The developed framework offers a flexible, efficient approach, contributing to industrial process optimization.

关键词： Multi-objective optimization Lookahead bayesian optimization Process optimization Multi-target gaussian process Acquisition function

来源：评论

学校读者我要写书评

暂无评论

Product-specific Identifiers and Data Aggregation for Enabling Traceability in Battery Cell Production 56

Product-specific Identifiers and Data Aggregation for Enabli...

引用

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

作者： Kies, Alexander D. Siegert, Ferdinand Ackermann, Thomas Krauß, Jonathan Grunert, Dennis Schmitt, Robert H. Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 Aachen52074 Germany Fraunhofer Research Institution for Battery Cell Production FFB Bergiusstr. 8 Münster48165 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH University Campus-Boulevard 30 Aachen52074 Germany

In the context of the ongoing energy transition from fossil fuels to renewable energies, suitable energy storage systems play a major role. An important aspect here is sustainable battery cell production itself, but also the generation of transparency about the battery life cycle, e. g. in form of a battery passport. To remain competitive and to ensure sustainable production, high product quality with low scrap rates during production has to be achieved. This is possible with process optimization and digitalization. One underlying requirement lies in a traceability system. To enhance quality of battery cells as well as to minimize scrap, tracing at the finest granularity serves as a key enabler. A broadly applied traceability solution has not yet been fully explored and central challenges lie in the linking of continuous and discrete production steps ' both from a digital and physical perspective. In this paper, we propose a concept for realizing a traceability system in battery cell production based on a product-specific identifier (ID) and the underlying data aggregation. The procedure for tracing an ID through the production steps of a battery cell, the assignment of relevant production data and the prototypical implementation, are presented. For this purpose, concept for battery cell production is introduced, which uses an object-oriented approach to link the different stages of the product ID with the respective production progress. The data generated in the process is aggregated and stored in a database, with the ID enabling unique assignment. Existing dependencies between individual entities of components to be traced and the assignment of corresponding data are shown by means of entity-relationship diagrams. Finally, the application of the concept and the validation are demonstrated using the first processes of electrode production. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco

关键词： Battery Cell Production Digitalization Industry 4.0 Traceability

来源：评论

学校读者我要写书评

暂无评论

Application of Fourier-related data reduction methods in sheet metal forming 14

Application of Fourier-related data reduction methods in she...

引用

14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Schwarz, Christian Link, Patrick Ihlenfeldt, Steffen Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz09126 Germany Institute of Mechatronic Engineering TU Dresden Helmholtzstrasse 7a Dresden01062 Germany Institute for Machine Tools and Production Processes TU Chemnitz Reichenhainer Strasse 70 Chemnitz09126 Germany

Due to the increasing digitalization, modern solutions are needed to work effectively with rapidly growing amounts of data in the automotive production. This paper shows two potential fields of application for the practical use of data reduction methods. In particular, the combination of Fourier-related transformation methods (e.g. discrete Fourier transform) and surrogate models for the useful 3D visualization of complex interrelationships is shown using the example of press hardening and deep drawing. © 2021 The Authors. Published by Elsevier B.V.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Synergy Analysis and verification of connected Cyber Physical Systems using virtual commissioning 14

Synergy Analysis and verification of connected Cyber Physica...

引用

14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Allmacher, Christoph Seiderer, Anna Klimant, Philipp Kuhl, Michael Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany Mittweida University of Applied Sciences Technikumplatz 17 Mittweida09648 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The design of cyber physical systems in today's production and intralogistics is influenced by the increasing availability and exchange of data. On the one hand, synergies between connected systems can be used to develop lightweight applications by sharing and reusing data. On the other hand, the possible combinations between these systems increase the complexity and design options. This paper presents a method to structure possible design options systematically and proposes virtual commissioning as solution for their analysis and verification to enable early design decisions. The method is demonstrated using an automated guided vehicle combined with a tactile warning device. © 2021 The Authors. Published by Elsevier B.V.

关键词： Cyber Physical System

来源：评论

学校读者我要写书评

暂无评论

Experimental validation of characteristic diagram- parameterization for environment-induced thermal interactions on machine tools in a climate chamber

引用

Procedia CIRP 2021年 99卷 63-68页

作者： Tharun Suresh Kumar Janine Glänzel Robert Tehel Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz 09126 Germany

Thermal gradients created by environmental influences on machine tools cause considerable non-linear thermo-elastic deformations whether the machine is in operation or in idle mode. When a machine tool is subjected to changes in environmental influences such as ambient air temperature, velocity or direction, then flow (CFD) simulations are necessary to effectively quantify the thermal behavior between the machine tool surface and the surrounding air. The conventional two-step simulation procedure consisting of coupled CFD and thermo-elastic simulation is highly time-consuming especially when complex geometries are considered. Decoupling of CFD and thermo-elastic simulation can be achieved by introducing a Clustering Algorithm (CA) and Characteristic Diagrams (CDs) within the simulation workflow. Using training data obtained from a limited number of CFD simulations, the CDs can predict the heat transfer coefficients (HTCs) based on the parameterized environmental influences. This paper attempts to validate the experimental temperature and displacement readings obtained at selected positions on a machine tool using a wide range of metrological equipment such thermography camera, temperature and displacement sensors with the decoupling approach based on parameterized CDs. For investigation, the machine tool is positioned in a climate chamber, which facilitates the variation of environmental influences such as ambient temperature, flow velocity and flow direction. Initially, a precise coupled simulation model is created which is later on converted to a decoupled system using parameterized CDs.

关键词： Decoupling approach CFD-FE simulation Experimental validation Clustering Genetic algorithm

来源：评论

学校读者我要写书评

暂无评论

Holistic Approach for Digitalized Quality Assurance in Battery Cell Production 56

Holistic Approach for Digitalized Quality Assurance in Batte...

引用

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

作者： Kies, Alexander D. Abramowski, Johann-Philip Ackermann, Thomas Kux, Fabian Kreppein, Alexander Grunert, Dennis Schmitt, Robert H. Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 Aachen52074 Germany Fraunhofer Research Institution for Battery Cell Production FFB Bergiusstr. 8 Münster48165 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH University Campus-Boulevard 30 Aachen52074 Germany

In this paper, we introduce a holistic approach to consider quality assurance (QA) for battery cell production (BCP). The framework, the explanation of the individual components as well as their interfaces and dependencies, and a detailed description are presented. Firstly, the level of necessary data (e. g. provided by online and out-of-line measurement systems) for the inspection of quality is presented. The aggregation of the recorded data as well as their tracing are ensured by the realization of a traceability system. Subsequently, by defining a suitable intelligent quality gate system, QA mechanisms are implemented and an active influence on production - e. g. by adaptive process control or identifying and reducing negative influence of cause-effect relationships - is aimed at. Finally, optimization of BCP in terms of product quality and its sustainability will be enabled. The evaluation of the demonstrated approach in practice is outlined based on an exemplary process of BCP. © 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： Battery Cell Production Industry 4.0 Quality Assurance Sustainability Traceability

来源：评论

学校读者我要写书评

暂无评论

A Tactical Planning Approach using Genetic Algorithms and Process Chain Simulation for Closed-Loop Production Systems for high-value components 57

A Tactical Planning Approach using Genetic Algorithms and Pr...

引用

18th IFAC Workshop on Time Delay Systems, TDS 2024

作者： Dranov, Alexander Juraschek, Max Obst, Birgit Herrmann, Christoph Siemens AG Otto-Hahn-Ring 6 Munich81739 Germany Institute of Machine Tools and Production Technology Sustainable Manufacturing and Life Cycle Engineering Technische Universität Braunschweig Langer Kamp 19b Braunschweig38106 Germany Fraunhofer Institute of Surface Engineering and Thin Films Riedenkamp 2 Braunschweig38108 Germany

The implementation of closed-loop production systems in manufacturing is a promising approach to mitigate environmental impacts and supply chain disruptions, while increasing the value and lifespan of products and materials. These systems integrate forward and reverse material flow activities such as repair, remanufacturing, and recycling within a single facility. However, a major challenge in planning and operating closed-loop production systems is the high uncertainty surrounding material availability and condition. Different process chains may be required depending on the extent and type of wear present in the used products. During the tactical planning phase, factory planners play a crucial role in evaluating and economically assessing various system and process chain configurations. Multiple technology chain and manufacturing equipment options provide different solutions for managing forward and reverse material flows. To address this, this paper introduces a metaheuristic framework based on discrete event simulation and genetic algorithms to evaluate these system configurations. The framework serves as decision-support for factory planners, whether they are planning a greenfield production system or undertaking a brownfield project aimed at transforming linear into circular production systems with both forward and reverse flows. The presented framework is built on data models that incorporate different technology and process chain options for manufacturing and repair, considering the condition of the cores. A manufacturing equipment database contains predefined data models describing machine skills and load profiles, which are utilized to generate various simulation models using different production system configurations. These models are then used to execute predefined scenarios. The main objective is to identify configurations that achieve a beneficial fitness value balancing technical, economic, and environmental key performance indicators for closed-loop p

关键词： Chains

来源：评论

学校读者我要写书评

暂无评论

Generative design in factory layout planning

引用

Procedia CIRP 2021年 99卷 9-14页

作者： Marian Süße Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

Planning and optimization of facility layouts have been investigated for decades and manifold approaches are applied for structuring and design of production layouts. However, results heavily depend on the experience and creativity of involved planning experts. Currently, complexity of planning processes constantly increases, e.g. due to further requirements of energy and media supply. Generative Design, hitherto mainly applied in component development, provides opportunities to cope with a much larger solution space and develop creative layout concepts. Thus, based on a structured overview on established planning methods, a concept and first results of factory layout planning with Generative Design are described.

关键词： Generative design Computational design Evolutionary design Factory planning Layout planning Literature search

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：