检索结果-内蒙古大学图书馆

11th International Conference on Porous Metals and Metallic Foams, MetFoam 2019

作者： Vogel, René Drebenstedt, Claudia Szyniszewski, Stefan Bittner, Florian Fras, Teresa Blanc, Ludovic Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany University of Surrey Guildford United Kingdom Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut WKI Hannover Germany Saint-Louis France

ISBN: (纸本)9783030427979

Protective performance and a low weight of armour plates are the most important objective in security applications. Metallic foams can provide a high level of protection without an extensive mass and were used as a part of various laminated armour systems in the past. Embedding small ceramic parts in metallic foam combines the hardness of ceramics with the flexibility of the lightweight cellular matrix. The material has an extreme cutting resistance against mechanical tools such as angle grinder, drill bits, or other cutting devices. In several testing campaigns, aluminium foams were combined with different internal layouts of stacked or integrated ceramics. The cellular core was foamed directly to steel cover sheets or was bonded to different steel alloy faceplates. In additional tests, blast wave propagation of the metallic foam ceramic composite (MFCC) panels was evaluated. Furthermore, several ballistic tests were performed and compared to state-of-the-art armour materials. It was possible to achieve better performance in this comparison to standard armoured steel at a lower overall weight. © 2020, The Minerals, Metals & Materials Society.

关键词： Metals

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

引用

Procedia CIRP 2021年 99卷 260-265页

作者： Christian Schwarz Patrick Link Steffen Ihlenfeldt Welf-Guntram Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz 09126 Germany Institute of Mechatronic Engineering TU Dresden Helmholtzstrasse 7a Dresden 01062 Germany Institute for Machine Tools and Production Processes TU Chemnitz Reichenhainer Strasse 70 Chemnitz 09126 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.

关键词： Press hardening Deep drawing FEM Sensitivity analysis Discrete Fourier Transform (DFT) Discrete Cosin Transform (DCT)

来源：评论

学校读者我要写书评

暂无评论

Inductive Sintering Module for Improved Multi-Die Attach in the Field of Power Packaging

Inductive Sintering Module for Improved Multi-Die Attach in ...

引用

IEEE CPMT Symposium Japan

作者： Christian Hofmann Patrick Rochala Martin Kroll Sushant Panhale Mario Baum Harald Kuhn Kiyoshi Oi Masaki Sanada Kei Murayama Department System Packaging Fraunhofer Institute for Electronic Nano Systems ENAS Chemnitz Germany Professorship for Forming and Joining Institute for Machine Tools and Production Processes (IWP) Chemnitz University of Technology Chemnitz Germany Department Systems Engineering Fraunhofer Institute for Electronic Nano Systems ENAS Chemnitz Germany Fraunhofer Institute for Electronic Nano Systems ENAS Chemnitz Germany Process Development Dept. SHINKO ELECTRIC INDUSTRIES CO. LTD. Nagano Japan

This work presents a heating technology for multi-die attach based on inductive silver sintering. Thus, the heat for the sintering reaction is confined locally to the bond region, avoiding heating of the entire power ...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dynamics of a driven harmonic oscillator coupled to pairwise interacting Ising spins in random fields

引用

Physical Review E 2021年第5期104卷 054212-054212页

作者： Paul Zech Andreas Otto Günter Radons Institute of Physics Chemnitz University of Technology 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Institute of Mechatronics Reichenhainer Str. 88 09126 Chemnitz Germany

In general we are interested in dynamical systems coupled to complex hysteresis. Therefore as a first step we investigated recently the dynamics of a periodically driven damped harmonic oscillator coupled to independent Ising spins in a random field. Although such a system does not produce hysteresis, we showed how to characterize the dynamics of such a piecewise-smooth system, especially in the case of a large number of spins [Zech, Otto, and Radons, Phys. Rev. E 101, 042217 (2020)]. In this paper we extend our model to spin dimers, thus pairwise interacting spins. We show in which cases two interacting spins can show elementary hysteresis, and we give a connection to the Preisach model, which allows us to consider an infinite number of spin pairs. This thermodynamic limit leads us to a dynamical system with an additional hysteretic force in the form of a generalized play operator. By using methods from general chaos theory, piecewise-smooth system theory, and statistics we investigate the chaotic behavior of the dynamical system for a few spins and also in the case of a larger number of spins by calculating bifurcation diagrams, Lyapunov exponents, fractal dimensions, and self-averaging properties. We find that the fractal dimensions and the magnetization are in general not self-averaging quantities. We show how the dynamical properties of the piecewise-smooth system for a large number of spins differs from the system in its thermodynamic limit.

关键词： Bifurcations Chaos Spin dynamics Chaotic systems Ising model Phase space methods

来源：评论

学校读者我要写书评

暂无评论

Surface modification for SMC moulding tools by laser remelting 19

Surface modification for SMC moulding tools by laser remelti...

引用

19th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2019

作者： Gärtner, E. Vogel, M. Schneider, J. Edelmann, J. Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)9780995775145

Due to their excellent material properties and their largely adjustable functionality, duromer components made of SMC (sheet moulding compound), which are mass-produced by compression moulding, are used in an increasing number of industries. Despite intensive development work in the field of stable production processes in compression moulding and a high-quality topcoat, the economic damage caused by paint failures is still very high at 20-30 %. Both, the demoulding process of the SMC components and their paintability are significantly influenced by the surface structure/topography of the moulding tool. One method of targeted layer modification is laser remelting. The paper presents the possibilities of laser remelting with a 20 W fiber laser by IPG Laser GmbH in detail. In the course of this, the influence of the inert gas use will be explained and a process chamber developed for this task will be evaluated. The processing results for hardened and tempered as well as soft annealed cold work steel are compared. Moreover, the influence of the laser processing on the heat treatment is derived. The residual surface was characterized and investigated by SEM (scanning electron microscopy) and EDX (energy dispersive X-ray spectroscopy). Furthermore, measurements of microhardness and surface roughness were performed. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Scanning electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Digital innovation hubs for robotics - TRINITY approach for distributing knowledge via modular use case demonstrations 8

Digital innovation hubs for robotics - TRINITY approach for ...

引用

8th CIRP Conference of Assembly technology and Systems, CATS 2020

作者： Lanz, Minna Reimann, Jan Ude, Aleš Kousi, Niki Pieters, Roel Dianatfar, Morteza Makris, Sotiris Tampere University Tampere Finland Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Jožef Stefan Institute Ljubljana Slovenia University of Patras Patras Greece

Robots are no longer stand-alone systems on the factory floor. The demand for industrial robots (market) is anticipated to be growing to 65 billion euros by the year 2023. Within all areas of robotics, the demand for collaborative and more flexible systems is rising as well. The level of desired collaboration and increased flexibility will only be reached if the systems are developed as a whole, e.g. perception, reasoning and physical manipulation. The rising need for collaborative robots in the automation industry is acting as a driver for this market and is expected to serve as a market opportunity for future growth. However, at the same time especially smaller companies have difficulties to formulate a concrete vision and strategies for the uptake of robotics, finding skilled workforce to develop and deploy the robot systems and/or work in the manufacturing industry. A number of Digital Innovation Hubs (DIHs) have been developed to enhance the knowledge and technology transfer from laboratories to factory floors, mitigating the skills gap and supporting the formulation of innovation ecosystems with the specific focus on small and medium-sized companies around Europe. The main aim of this paper is to introduce the concept and approach taken in H2020 TRINITY-project that aims to develop a Robotics Innovation Hub focused on Agile Production. The paper will introduce the concept and technical approach of the project, and discusses the preliminary results, challenges and opportunities of these kind of DIHs. © 2020 The Author(s).

关键词： Industrial robots

来源：评论

学校读者我要写书评

暂无评论

Retrieving properties of manufacturing systems from traceability data for performance evaluation and material flow simulation 54

Retrieving properties of manufacturing systems from traceabi...

引用

54th CIRP Conference on Manufacturing Ssystems, CMS 2021

作者： Reinhardt, Heiner Münnich, Marc Prell, Bastian Arnold, Roman Krippner, Fabian Weber, Marek Seifert, Frank Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Technical University of Applied Science Wildau Hochschulring 1 Wildau15745 Germany Volkswagen Sachsen GmbH Motorenwerk Chemnitz Kauffahrtei 47 Chemnitz09120 Germany Chemnitz University of Technology Straße der Nationen 62 Chemnitz09111 Germany

The operation of manufacturing systems is increasingly accompanied by data-driven continuous improvement processes and product traceability is required. Commonly, radio-frequency identification (RFID) technology is applied to track the flow of a uniquely-identifiable workpiece along various stations or waypoints within a factory. Based on an automotive use case, this paper describes how to analyze the resulting traceability data in order to identify several properties of a manufacturing system. The acquired knowledge can support performance evaluation and facilitate model building for material flow simulation as a foundation for digital twins and cyber-physical production systems. © 2021 Elsevier B.V.. All rights reserved.

关键词： Knowledge management

来源：评论

学校读者我要写书评

暂无评论

A survey on modeling and forecasting the energy consumption in discrete manufacturing

引用

Procedia CIRP 2020年 90卷 443-448页

作者： Heiner Reinhardt Jan-Peter Bergmann Marc Münnich David Rein Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz 09126 Germany

The manufacturing industry faces environmental challenges due to its high electrical energy demand. Measures for improving the energy efficiency of manufacturing processes are applied to reduce the total energy consumption while eco-friendly renewable energy sources are harnessed increasingly. However, the volatile nature of renewables drives a change in energy allocation and the electrical grid. Both energy efficiency and energy allocation may benefit from accurate energy consumption modeling and forecasting. In this paper we constitute the state of the art of existing modeling techniques in the domain of discrete manufacturing and derive future research activities.

关键词： Energy Energy efficiency Forecast Manufacturing Modeling

来源：评论

学校读者我要写书评

暂无评论

Working gap analysis in electrochemical precision machining of external geometries with ring cathodes

Working gap analysis in electrochemical precision machining ...

引用

20th CIRP Conference on Electro Physical and Chemical Machining, ISEM 2020

作者： Schaarschmidt, Ingo Hackert-Oschätzchen, Matthias Meichsner, Gunnar Steinert, Philipp Zinecker, Mike Schubert, Andreas Micromanufacturing Technology Chemnitz University of Technology Chemnitz09107 Germany Manufacturing Technology with Focus Machining Otto von Guericke University Magdeburg Magdeburg39106 Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz09126 Germany

Pulsed electrochemical machining (PECM) with oscillating cathode is a non-conventional manufacturing technology to machine complex precision geometries independent from the mechanical properties of the workpiece material. PECM with oscillating cathode is an advanced development of conventional ECM by applying a pulsed electric current in conjunction with an oscillating movement of the cathode. Result is electrochemical precision machining with a more stable process combined with better accuracy and quality. This work focuses on the analysis of the resulting side working gap in electrochemical precision machining of external geometries by applying PECM. Therefore, the height of a ring cathode was varied to adjust the cathode inner surface. The resulting side working gap was studied through multiscale multiphysics simulation applying COMSOL Multiphysics as well as experiments applying a PEMCenter 8000. As main result, the increase of the resulting side working gap as consequence of an increasing cathode inner surface will be analysed in detail. © 2020 The Authors. Published by Elsevier B.V.

关键词： Cathodes

来源：评论

学校读者我要写书评

暂无评论

A comprehensive and interdisciplinary perspective on sustainable manufacturing towards sustainable life cycles

引用

Procedia Manufacturing 2020年 43卷 383-390页

作者： Marion Früchtl Miriam Leis Rafael Wertheim Fraunhofer-Gesellschaft Munich 80686 Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz 09126 Germany / Braude Karmiel Israel

For achieving sustainable manufacturing it may not be enough to only focus on manufacturing processes, systems and products as separate entities for optimization, but it may require analyzing and engineering their broader and possibly unobvious interconnections. Whereas new technologies can play a significant role in resource efficiency, sustainability improvement and life cycle engineering, other factors like consumer behavior, global cost structures and even geopolitical issues play an important role for achieving sustainable manufacturing and sustainable life cycle development. This requires interdisciplinary research and analysis approaches. Concepts like Socio-Technical Systems (STS), Life Cycle Analysis (LCA) and systems engineering can help uncover the multiple impacting factors to be considered in comprehensive sustainability analysis and engineering.

关键词： Sustainability manufacturing Socio-Technical Systems Life Cycle Analysis Biological Transformation interdisciplinarity

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：