检索结果-内蒙古大学图书馆

30th International Conference on Computer Graphics and machine Vision, GraphiCon 2020

作者： Mende, Mattias Wiener, Thomas Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

This article describes, how color textures can be reliably detected and classified in the production process independent of external parameters such as brightness, object positions (translation), angulars (rotation), object distances (scaling) or curved surfaces (rotation + scaling). The methods described here are also suitable for reliably classifying at least 18 color textures even if they differ only slightly from each other optically. The online classification of color textures is a classic task in the wood, furniture and textile industry. For example, unwanted defects or partial soiling on moving webs can be reliably detected regardless of fluctuations in brightness and/or shadows during process operation. Algorithms has been developed for teach-in with RGB-HSI-transform, set fewer segments on the color textures of each class with e.g. 24x24 Pixel, use suitable transformations {HSI}, e.g. 2D-FFT for formation characteristic 2D spectral mountains in these segments, extraction of statistical features and setting up the individual classifiers. Algorithms has been developed for identification & classification in process operation with extraction of statistical characteristics and methods of robust classification. The implementation of the methods, the triggering of the color cameras, the processing of the color information including the output of the results to the process control is done with the data analysis program Xeidana®. © 2020 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： Color

来源：评论

学校读者我要写书评

暂无评论

Tool concept for structure rolling to improve tribologically stressed components 20

Tool concept for structure rolling to improve tribologically...

引用

20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Schmidt, Torsten Schneider, Jörg Edelmann, Jan Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)9780995775176

Extensions of functional ranges and increases in efficiency are among the constant companions in automotive engineering as well as in machine tool industry. In most cases, increased performance requirements meet lower or constant component dimensions, whereby the functional surfaces are exposed to higher loads. These are often components subject to high tribological stress, such as friction bearings or cylinder liners. Against this background, these surfaces are often functionalized by coatings or microstructures in order to meet the increased requirements. For surface micro structuring, a number of processes are known which differ in their suitability for specific applications and series production. Structure rolling offers great potential for the structuring of rotationally symmetric components. With this process the positive structure of the embossing roller is replicated onto the workpiece surface under a defined contact force. This comparatively simple method of structure generation enables a fast and flexible process for transferring different structural geometries to extensive component surfaces. The publication focuses on structure rolling as efficient manufacturing technology. Within the scope of several research projects, various tool concepts have been implemented and advanced, whereby the current tool design is presented and discussed. In addition, the dimensioning and production of the positive structure on the embossing roller by means of laser structuring is described. The potentials of the process are shown by means of an application-oriented example. Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Tribology

来源：评论

学校读者我要写书评

暂无评论

Design model for digital shadows to support reconfiguration decisions in manufacturing

引用

Procedia CIRP 2025年 132卷 153-158页

作者： Michael Riesener Eric Rebentisch Alexander Keuper Aileen Blondrath Philipp Weber Günther Schuh Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Aachen Germany Sociotechnical Systems Research Center Massachusetts Institute of Technology (MIT) Cambridge USA Fraunhofer Institute for Production Technology IPT Aachen Germany

Personalized production is the result of a paradigm shift in manufacturing driven by customers who are seeking increasingly individualized solutions. Consequently, product families with a high number of variants and short innovation cycles force companies to capture smaller windows of opportunity to stay competitive in a global market. Reconfigurable Manufacturing Systems can address this trend by enabling the manufacturing system to be reconfigured in response to changing environmental conditions. However, deciding when to execute a reconfiguration and selecting a suitable manufacturing system configuration for the future is a complex task that requires profound knowledge of the manufacturing system and potential environmental influences. Thus, this paper proposes utilizing Digital Shadows to substantiate reconfiguration decisions with a networked information base. To process this information into an objective decision support, Time-expanded Decision Networks evaluate a sequence of future reconfiguration decisions with regard to economic and environmental target dimensions.

关键词： Reconfigurable manufacturing system Digital twin Digital shadow Digital manufacturing Manufacturing flexibility

来源：评论

学校读者我要写书评

暂无评论

Mycelium-based-composites – Vision for substitution of fossil-based materials

引用

Procedia CIRP 2024年 125卷 78-83页

作者： Steffen Ihlenfeldt Stefan Schillberg Christoph Herrmann Simon Vogel Robar Arafat Simon Harst Chair of Machine Tools Development and Adaptive Controls Insitute of Mechatronic Engineering TU Dresden Helmholtzstraße 7a 01069 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Pforzheimer Str. 7a 01189 Dresden Germany Chair of Molecular Biotechnology Worringerweg 1 RWTH Aachen University 52074 Aachen Germany Fraunhofer Institute for Molecular Biology and Applied Ecology IME Forckenbeckstr. 6 52074 Aachen Germany Chair of Sustainable Manufacturing & Life Cycle Engineering Institute of Machine Tools and Production Technology IWF Technische Universität Braunschweig Langer Kamp 19b 38106 Braunschweig Germany Fraunhofer Institute for Surface Engineering and Thin Films IST Riedenkamp 2 38108 Braunschweig Germany

For decades, fossil-based materials have formed the basis of an almost endless range of technical products. Through variable chemical composition and several additives, especially plastics can have a wide range of properties, which form the basis for the diversity of plastic-based products. While this variability enables many sustainability strategies, such as lightweighting, it is also impeding a fully circular economy. Therefore, in recent years, a number of new raw materials have been developed, but they can only cover a very limited part of the wide range of properties of fossil-based plastics. Another promising class of materials are composites based on fungal mycelium. However, these are mainly limited to the consumer sector, e.g. vegan leather, where there is smaller demand for durability, functionality etc. The step from consumer to engineering materials require the production (or growth) process to be reproducible within the necessary quality requirements. Cyber-physical production systems have the potential to realise necessary technical qualities despite e.g. quality fluctuations of the raw material and production processes that are susceptible to interference. For this reason, this paper analyses the state of the art in production of mycelium based composites, shows the existing gaps and draws a vision to close these gaps.

关键词： cyber-physical production biological transformation mycelium-based composites

来源：评论

学校读者我要写书评

暂无评论

Energy efficiency and energy flexibility in matrix production systems

引用

Procedia CIRP 2025年 134卷 945-950页

作者： Marc Münnich Steffen Ihlenfeldt Sebastian Thiede Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Institute of Mechatronic Engineering Technical University Dresden Helmholtzstr. 7a 01069 Dresden Germany Department of Design Production and Management University of Twente De Horst 2 7522 LW Enschede The Netherlands

Competitive and regulatory pressure force companies to produce more flexible and reactive to market demands and also include electrical energy-related considerations in production system planning and operation to reduce energy cost and environmental impact. Matrix production systems are perceived to cope with turbulent market environments but are only investigated from a logistics point of view. Potentials regarding energy efficiency and energy flexibility that arise from the inherent flexible production infrastructure remain unclear. This paper aims to systematically investigate the potential contributions of the flexible production structures and to point out general hypotheses about synergies as well as conflicts for logistics and energy-related target dimensions. These are evaluated in a simulation study based on an industrial use case. Results indicate that there are various control levers to support energy efficiency as well as energy flexibility together with logistics target dimensions in MPS.

关键词： Matrix production Discrete-event simulation Energy efficiency Energy flexibility

来源：评论

学校读者我要写书评

暂无评论

Cooling Lubricant Boundary Conditions for wet Turning Simulations 16

Cooling Lubricant Boundary Conditions for wet Turning Simula...

引用

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

作者： Uhlmann, Eckart Barth, Enrico Nabbout, Kaissar Sommerfeld, Martin Bock-Marbach, Benjamin Kuhnert, Jörg Dovgal, Andrey Chair of Machine Tools and Manufacturing Technology Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany Otto von Guericke University Magdeburg Institute of Process Engineering Universitaetsplatz 2 Magdeburg39106 Germany Fraunhofer Institute for Industrial Mathematics ITWM Fraunhofer-Platz 1 Kaiserslautern67663 Germany

In recent years, the rise in computation and modelling capabilities has enabled first chip formation simulations for wet cutting processes. Currently, chip formation simulations are limited to a small simulation domain around the cutting edge. Hence, vague assumptions of inflow boundary conditions of the cooling lubricant must be made. In this paper, a procedure is shown to determine the boundary conditions of the free fluid jet for different cooling lubricant strategies by combination of Particle Image Velocimetry (PIV) and meshfree fluid simulations. As a result, usual assumptions of cooling lubricant boundary conditions are evaluated and deviations are identified. © 2023 Elsevier B.V.. All rights reserved.

关键词： Velocity measurement

来源：评论

学校读者我要写书评

暂无评论

Development of Thin-film Sensors for In-process Measurement during Injection Molding 56

Development of Thin-film Sensors for In-process Measurement ...

引用

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

作者： Schott, Anna Rekowski, Martin Timmann, Frederic Herrmann, Christoph Dröder, Klaus Fraunhofer Institute for Surface Engineering and Thin Films IST Bienroder Weg 54 E Braunschweig38108 Germany Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b Braunschweig38106 Germany

Resource and energy efficiency in manufacturing is of great significance for future developments. Digitization is becoming an important strategy for meeting these challenges and opening up different paths to sustainability. Injection molding as a high-volume process technology offers great opportunities for this approach due to its wide range of applications, producing polymer parts for use in industrial, automotive and consumer use. Due to process variation and individualizations, manufacturing ramp-ups currently produce significant volumes of scrap due to process variations. For improved process parameter setting and validation of simulation models in-process measurement data is mandatory and expected to be a key enabler for automated real-time quality monitoring in future production. One way to measure temperature and melt flow directly in the cavity with contact to the melt is to use thin-film sensors. They are applied to the surface of the tool with high hardness, high wear resistance, low coefficient of friction and high load capacity, are very small and only a few micrometers thick. This research describes the development of thin-film sensors, starting with the tool concept to integrate a sensor insert, followed by the physical operating principle. The developed thin-film layer system and its fabrication process using vacuum-based deposition techniques such as physical vapor deposition and chemical vapor deposition are explained. Combined with microstructuring techniques such as photolithography, the thin-film sensor structures were fabricated and their thermoresistive behavior is characterized. The applied sensor design with a high spatial resolution to detect both temperature and flow front movement is shown. Finally, the developed sensors were experimentally tested in the laboratory. Results of temperature measurements, sensor performance and flow front movement are presented and future potential for applications are discussed. © 2023 The Authors. Publishe

关键词： Data Analysis In-process Temperature Measurement Injection Molding Process Monitoring Thin-film Sensor

来源：评论

学校读者我要写书评

暂无评论

Vacuum gripper without central compressed air supply

引用

Procedia CIRP 2021年 97卷 76-80页

作者： Robert Schaffrath Erik Jäger Georg Winkler Jan Doant Marcel Todtermuschke Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

Compressed air operated industrial equipment has been always an important part of car body production. Advantages of compressed air powered tools are their robust construction, low-cost manufacturing as well as high performances especially forces at a minimum of construction size. Disadvantages are high operating costs, due to pressure losses in case of leakage, high installation costs and intricate cabling especially at highly flexible manufacturing systems. As a result, many automobile manufacturers aiming for a reduction of air powered production tools or even air free automobile manufacturing systems. Against this background a new concept of a vacuum grippers will be presented, which does not need central compressed air supply. Results of the development of suction cups will be shown, which are based on mechanical air displacement inspired by artificial muscles. Furthermore, a control of clusters of new suction cups with artificial intelligence is given.

关键词： Automotive Body shop End of arm tooling Gripper Vacuum Sucktion cups Compressed air supply

来源：评论

学校读者我要写书评

暂无评论

The RaRe2 Attempt as a Holistic Platform for Decision Support in Rapidly Changing Process Chains 9th

The RaRe2 Attempt as a Holistic Platform for Decision Suppor...

引用

Production Processes and Product Evolution in the Age of Disruption - Proceedings of the 9th Changeable, Agile, Reconfigurable and Virtual Production Conference CARV2023 and the 11th World Mass Customization and Personalization Conference MCPC2023

作者： Teicher, Uwe Ben Achour, Anas Selbmann, Erik Demir, Ozan Emre Arabsolgar, Dena Cassina, Jacopo Ihlenfeldt, Steffen Colledani, Marcello Fraunhofer Institute for Machine Tools and Forming Technology IWU Pforzheimer Straße 7a Dresden01189 Germany Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy Syxis VSI Europos pr. 122 Kaunas46351 Lithuania Institute of Mechatronic Engineering Technische Universität Dresden Dresden01069 Germany

ISBN: (纸本)9783031348204

The trend towards globalization is increasingly being questioned or put under the microscope for social, political, and economic policy reasons. Due to the closely net-worked trade relations unpredictable events like pandemics, natural disasters, technical disruptions of supply chains and political conflicts can have considerable economic and social consequences. However, the central point is the constantly and rapidly changing market conditions to which it is necessary to react, or which must be shaped in order to adequately and successfully counter new technologies or new competitors. Within this paper it is worked out that based on targeted support of decision makers from top management to lower management and of the executing staff, the economic consequences for companies can be lowered with data-driven approaches and furthermore the. The objective of this paper is to help tackling reconfiguration needs via a holistic approach with the human being in the centre. The central hypothesis consists of the fact that with standards and defined methods, data-driven tools such as the digital twin or dedicated software applications for decision support specifically for information-based decisions, it is possible to deal more robustly and resiliently with rapid changes in the business environment. Based on exemplary use cases of automotive and medical technology as well as precision manufacturing of optical components, a holistic ecosystem platform RaRe2 will be developed, which will be disseminated as a reference for innovative software concepts on an industrial scale. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Supply chains

来源：评论

学校读者我要写书评

暂无评论

A case study on the use of open source hardware in mechanical engineering

引用

Procedia CIRP 2024年 128卷 680-685页

作者： Cäcilia Veliu Valentin Petzold Dirk Reichelt Maximilian Stange Steffen Ihlenfeldt Dresden University of Applied Sciences Friedrich-List-Platz 1 01069 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Institute of Mechatronic Engineering Technical University Dresden Helmholtzstr. 7a 01069 Dresden Germany

Open Source Hardware (OSH) enables innovative developments and business models. The OSH approach creates new forms of cross-company product development and community-based innovation processes. Open source has been state of the art in software industry for years. When it comes to OSH projects, however, the focus is primarily on the consumer sector. The use of OSH for industrial products, especially in mechanical engineering, is still in its early stages. The paper presents a case study on the development of an application module based on OSH components in a R&D testbed. The developed module is intended to enable electronic functional testing. For this purpose, the development process involved, among other things, creating solutions for a tool changing system. Using the case study, we analyse the advantages and disadvantages of the open source licenses used and derive implications for the R&D process. Building on this, various concepts for the use, adaptation and expansion of OSH components and the resulting implications for development processes and business models are presented. The case study is used to analyse which established open source software concepts can be transferred to material assets, but also which additional requirements arise from OSH components, e.g. in the area of safety.

关键词： Open Source Hardware Open Innovation Design: challenges & innovation

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：