检索结果-内蒙古大学图书馆

Manufacturing of Long Products Made of Innovative Lightweight Materials

Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1496-1502页

作者： Karsten Richter Roland Müller Andreas Kunke Verena Kr? usel Dirk Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Professorship Forming and Joining (UFF) Technische Universit?t Chemnitz

The processing of innovative lightweight materials to sheet metal components and assemblies with globally or locally defined properties is the object of this work. It takes a load-dependent design of components and assemblies, for example, based on the composition of different construction materials or a targeted setting of component areas with specified characteristics to fully exploit the lightweight potential when substituting conventionally used materials. Different process chains for the manufacturing of roll-formed long products made of magnesium alloys and high-strength steels with locally defined properties will be presented in this paper. Depending on the kind of material to be formed and the desired product characteristics, different temperature managements are needed for capable processes. Due to limited formability at room temperature, magnesium alloys require a heating of the forming zones above 200–225 °C throughout the bending process in order to activate additional gliding planes and to avoid any failures in the radii. The realization of local hardening effects requires at least one process-integrated heat treatment when roll forming manganese–boron steels. For both processes, it is imperative to realize a heating and cooling down or quenching appropriate for the manufacturing of long products with the required quality. Additionally, proper line speeds that allow a continuously operated economical production have to be considered. Research results including design, FEA, realization and experimentation of the mentioned process chains and strategies will be described in detail.

关键词： Roll forming Heat treatment Lightweight component Light metals Manganese steels AZ31 magnesium alloy

来源：评论

学校读者我要写书评

暂无评论

Adaptronic Applications in Cutting machines

引用

Procedia CIRP 2016年 46卷 303-306页

作者： W.-G. Drossel A. Bucht K. Pagel T. Mäder T. Junker Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

Adaptronic systems are able to improve high performance cutting technologies making them more stable, economic and efficient leading to a higher product quality. The main objectives of adaptronic systems in production technologies, beyond controlling process parameters, are either reducing vibration or generating them. The latter topic is a highly innovative area of research since it offers alternative approaches to improve product quality and optimize machining processes regarding efficiency and economy. Current research at fraunhofer Institute for machine tools and forming technology iwu focuses on facilitating the transfer of scientific knowledge to industrial solutions. Therefore, possible reasons preventing industrial application of adaptronic systems in cutting machines are identified and initial ideas to overcome these problems are presented.

关键词： machine tool Adaptive control Vibration assisted machining

来源：评论

学校读者我要写书评

暂无评论

Process development and tooling design for intrinsic hybrid composites

引用

Journal of Physics: Conference Series 2017年第1期896卷

作者： M Riemer R Müller W G Drossel D Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz www.iwu.fraunhofer.de

Hybrid parts, which combine the advantages of different material classes, are moving into the focus of lightweight applications. This development is amplified by their high potential for usage in the field of crash relevant structures. By the current state of the art, hybrid parts are mainly made in separate, subsequent forming and joining processes. By using the concept of an intrinsic hybrid, the shaping of the part and the joining of the different materials are performed in a single process step for shortening the overall processing time and thereby the manufacturing costs. The investigated hybrid part is made from continuous fibre reinforced plastic (FRP), in which a metallic reinforcement structure is integrated. The connection between these layered components is realized by a combination of adhesive bonding and a geometrical form fit. The form fit elements are intrinsically generated during the forming process. This contribution regards the development of the forming process and the design of the forming tool for the single step production of a hybrid part. To this end a forming tool, which combines the thermo-forming and the metal forming process, is developed. The main challenge by designing the tool is the temperature management of the tool elements for the variothermal forming process. The process parameters are determined in basic tests and finite element (FE) simulation studies. On the basis of these investigations a control concept for the steering of the motion axes and the tool temperature is developed. forming tests are carried out with the developed tool and the manufactured parts are analysed by computer assisted tomography (CT) scans.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Manufacturing of hybrid aluminum copper joints by electromagnetic pulse welding – Identification of quantitative process windows

引用

AIP Conference Proceedings 2017年第1期1896卷

作者： Verena Psyk Christian Scheffler Maik Linnemann Dirk Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology – IWU Reichenhainer Strasse 88 09126 Chemnitz Germany

Compared to conventional joining techniques, electromagnetic pulse welding offers important advantages especially when it comes to dissimilar material connections as e.g. copper aluminum welds. However, due to missing guidelines and tools for process design, the process has not been widely implemented in industrial production, yet. In order to contribute to overcoming this obstacle, a combined numerical and experimental process analysis for electromagnetic pulse welding of Cu-DHP and EN AW-1050 was carried out and the results were consolidated in a quantitative collision parameter based process window.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Process simulation and experimental validation of Hot Metal Gas forming with new press hardening steels

引用

Journal of Physics: Conference Series 2017年第1期896卷

作者： A. Paul F. Reuther S. Neumann A. Albert D. Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology (Fraunhofer IWU) Reichenhainer Straße 88 09126 Chemnitz Germany

One field in the work of the fraunhofer Institute for machine tools and forming technology iwu in Chemnitz is industry applied research in Hot Metal Gas forming, combined with press hardening in one process step. In this paper the results of investigations on new press hardening steels from SSAB AB (Docol®1800 Bor and Docol®2000 Bor) are presented. Hot tensile tests recorded by the project partner (University of West Bohemia, Faculty of Mechanical Engineering) were used to create a material model for thermo-mechanical forming simulations. For this purpose the provided raw data were converted into flow curve approximations of the real stress-real strain-curves for both materials and afterwards integrated in a LS-DYNA simulation model of Hot Metal Gas forming with all relevant boundary conditions and sub-stages. Preliminary experimental tests were carried out using a tool at room temperature to permit evaluation of the forming behaviour of Docol 1800 Bor and Docol 2000 Bor tubes as well as validation of the simulation model. Using this demonstrator geometry (outer diameter 57 mm, tube length 300 mm, wall thickness 1.5 mm), the intention was to perform a series of tests with different furnace temperatures (from 870 °C to 1035 °C), maximum internal pressures (up to 67 MPa) and pressure build-up rates (up to 40 MPa/s) to evaluate the formability of Docol 1800 Bor and Docol 2000 Bor. Selected demonstrator parts produced in that way were subsequently analysed by wall thickness and hardness measurements. The tests were carried out using the completely modernized Dunkes/AP&T HS3-1500 hydroforming press at the fraunhofer iwu. In summary, creating a consistent simulation model with all relevant sub-stages was successfully established in LS-DYNA. The computation results show a high correlation with the experimental data regarding the thinning behaviour. The Hot Metal Gas forming of the demonstrator geometry was successfully established as well. Different hardness values could b

关键词：

来源：评论

学校读者我要写书评

暂无评论

Criteria for Energy-efficiency of Technological Processes, Technological machines and Production Engineering

引用

Procedia CIRP 2016年 46卷 340-343页

作者： A.P. Kuznetsov P. Blau H.-J. Koriath M. Richter Moscow State University of Technology “STANKIN” 127055 Moscow Russia Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

At present, a large number of methods for processing and forming of parts and products, technological processes and equipment have been created for their implementation. Trends towards improved productivity, accuracy, reliability, flexibility, economy of the technological process, technological machines and machine system demand the development of new methods for the analysis of their effectiveness. A unified approach to the assessment of the effectiveness of processes, equipment and production allows considering them as energy-information model in which there is a transformation of all types and forms of energy, matter and information. This allows considering the concept of “energy efficiency” as the relative coefficient of efficiency of the collection of all kinds of transformative mechanisms and devices. On the basis of the proposed energy-information model is given the generalized method for the evaluation and comparison of the integral energy efficiency of technological processes, technological machines and production engineering. Due to the directive for the ecodesign of energy-related products (2009/125/EC) and economic factors a metal cutting machine tool has been evaluated over its whole life cycle. A methodology of Life Cycle Impact Assessment (LCIA) was used to unfold the main ecological footprint. The energy consumption of the machine tool and in particular its components was measured for the manufacturing of a defined work piece. The results state priority resource saving potentials of the machine tool. Theoretical calculations and experimental evaluation are presented and compared in order to propose methods for industrial applications.

关键词： machine manufacturing process energy-information model energy efficiency criteria

来源：评论

学校读者我要写书评

暂无评论

Towards Agile Engineering of Mechatronic Systems in machinery and Plant Construction

引用

Procedia CIRP 2016年 52卷 68-73页

作者： Thorsten P. Klein Gunther Reinhart Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Project Group Resource-efficient Mechatronic Processing Machines Beim Glaspalast 5 86153 Augsburg Germany www.iwu.fraunhofer.de/rmv

Agile procedures (e.g. Scrum) are commonly used in rapidly changing environments of software engineering. Experts appreciate improvements in interdisciplinary collaboration, lead times and development costs by applying agile techniques as artifacts, meetings, roles and visualisation methods. Up to now, the use of agile procedures is still limited to IT-projects, due to a lack of profound knowledge in transferring agile techniques into interdisciplinary projects. This contribution presents the research work on Agile Engineering, a counterpart of Lean Product Development, by the systematic integration of agile techniques into the development process of mechatronic production systems. Thereto, an introduction and state of the art is given concerning the industry sector of machinery and plant construction as well as agile methodologies. The main focus of the paper is represented by the classification and comparison of Agile Engineering as well as the main features of integrating agile techniques into the mechatronic engineering process. According to the advanced research insights of the last years, Agile Engineering is a new enabler of success for establishing an agile production, providing promising approaches for coping with change and uncertainty efficiently.

关键词： Agility Mechatronics Engineering Process Lean Product Development Scrum

来源：评论

学校读者我要写书评

暂无评论

Application of Substructure Decoupling Techniques to Predict Mobile machine Tool Dynamics: Numerical Investigations

引用

Procedia CIRP 2016年 46卷 537-540页

作者： Mohit Law Hendrik Rentzsch Steffen Ihlenfeldt Matthias Putz Indian Institute of Technology Kanpur India Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz 09126 Germany Institute of Machine Tools and Control Engineering Technische Universität Dresden Germany

In situ machining of large workpieces is made possible by moving mobile machines to workpiece locations. To guide and enhance on site machining performance, dynamics of the assembled system must be predicted beforehand. Beforehand prediction of assembled response requires dynamics of the mobile machine in its free-free configuration be coupled with response of base/workpiece measured at location. Since obtaining the free-free response of the machine is non-trivial, this paper presents a substructure decoupling scheme that instead extracts the machine's response from known dynamics of the machine mounted on a base, and from information of a substructural base system. Simulation driven investigations show the decoupling scheme to be robust even under the vagaries of measurement noise and changes in the residual substructural base system. Extracted dynamics of the machine can be subsequently synthesized with known dynamics of other bases/workpieces for a priori prediction of assembled dynamics to guide first-time-right on site machining.

关键词： Dynamics machine tool Simulation Mobile machine Substructure decoupling

来源：评论

学校读者我要写书评

暂无评论

Investigation of the Time-invariance and Causality of a machine Tool for Performing Operational Modal Analysis

引用

Procedia CIRP 2016年 46卷 400-403页

作者： Matthias Putz Volker Wittstock Martin Kolouch Jan Berthold Technische Universität Chemnitz Professorship for Machine Tools and Forming Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88 09126 Chemnitz Germany

The dynamic behaviour of machine tools affects the work-piece quality and productivity. Generally, the difference between the dynamic properties at standstill and during machining is neglected by the commonly applied assessment methods for production systems. Operational modal analysis takes into account these cutting- and operation-dependent influences. However, operation conditions might cause violation of the common measurement assumptions regarding time-invariance and causality. The investigations consider the time-invariance by the measurement of frequency response functions over the working space including the evaluation of mode shapes. The causality is evaluated by dynamic measurements at TCP excited by feed motions.

关键词： machine tool Dynamics Operational modal analysis

来源：评论

学校读者我要写书评

暂无评论

New microfluidic functionalities by nano- And micro-patterned moulds 16

New microfluidic functionalities by nano- And micro-patterne...

引用

16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Edelmann, Jan Eckert, Udo Groß, Stefan Gründig, Bernd Wedig, Heiko Usov, Victor O'hara, Neal Scanlan, Declan Cross, Graham Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany An EKF Diagnostics Company Senslab Gesellschaft zur Entwicklung und Herstellung bioelektrochemischer Sensoren mbH Leipzig Germany Adama Innovations Ltd. 13 Webworks Forster Street Galway Ireland

ISBN: (纸本)9780956679086

FaBiMed is a European project established to develop new manufacturing strategies for medical micro devices, using polymer replication in production of cost effective miniaturized micro and nanostructured components in biocompatible and functional materials. One demonstration line is dedicated to compact disposable lab-on-chip devices and requires micro and nano-structuring of the mould surface in order to change wetting characteristics of microfabricated devices and enable them with additional microfluidic functional features such as micro-channels or cell filters. Such features must be effectively replicated by hot-embossing (HE) or microinjection moulding (IM), at the same time avoiding time-dependent clogging by residual polymer, after multiple replication cycles. The paper describes the mould manufacturing process combining four sequential technologies as well as the replication results.

关键词： Microfluidics

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：