检索结果-内蒙古大学图书馆

Process development and tooling design for intrinsic hybrid composites

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

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

Tool Technologies for Milling of Hardmetals and Ceramics

引用

Procedia CIRP 2016年 46卷 299-302页

作者： Thomas Bergs Volkmar Richter Michael Ottersbach Johannes Pötschke Carsten Hochmuth Katia Busch Fraunhofer Institute for Production Technology IPT 52074 Aachen Germany Fraunhofer Institute for Ceramic Technologies and Systems 01277 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany

Hardmetals and ceramics are major substrate materials for a wide range of cutting tools and forming dies. Due to their high specific hardness the final part geometry is usually obtained by sintering of preformed green parts, electrical discharge machining, grinding and/or polishing. Machining by milling is not possible due to fast and unpredictable milling tool failures. To enable milling for tungsten carbides and ceramics new tool technologies are developed. The technologies encompass nanoscaled tungsten carbide hardmetals, innovative coating systems, new milling tool designs as well as adapted milling processes. By combining these technologies it becomes possible to mill different grades of hardmetals and ceramics with hardness values over 1200 HV10.

关键词： Milling cutting ultrafine cemented carbides nanoscaled cemented carbides hard machining

来源：评论

学校读者我要写书评

暂无评论

Surface Characterization of Particle Reinforced Aluminum-matrix Composites Finished by Pulsed Electrochemical Machining

引用

Procedia CIRP 2016年 45卷 351-354页

作者： Matthias Hackert-Oschätzchen Norbert Lehnert André Martin Gunnar Meichsner Andreas Schubert Professorship Micromanufacturing Technology Technische Universität Chemnitz 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany

Aluminum matrix composites (AMCs) are difficult to machine conventionally. Pulsed Electrochemical Machining (PECM) is an alternative method to machine AMCs. Metals can be machined without contact, independent of material hardness and without mechanical or thermal impact. During the process no tool wear occurs. The AMCs consist of an aluminum matrix, which is easily to machine with PECM, and SiC-particles, which cannot be dissolved during the electrochemical machining process applying neutral electrolytes. This combination leads to a special behavior of dissolution and anodization. In this study, the influence on the surface layer, caused by Pulsed Electrochemical Machining of AMCs, is analyzed.

关键词： Pulsed Electrochemical Machining Micro machining Particle Reinforced Aluminum ECM

来源：评论

学校读者我要写书评

暂无评论

Generation of Defined Surface Waviness on Tungsten Carbide by Jet Electrochemical Machining with Pulsed Current

引用

Procedia CIRP 2016年 45卷 231-234页

作者： André Martin Christian Eckart Norbert Lehnert Matthias Hackert-Oschätzchen Andreas Schubert Technische Universität Chemnitz Professorship Micromanufacturing Technology 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany

Conventional machining of WC6Co carbide metal is challenging due to its mechanical properties. Electrochemical machining applying a continuous free jet and pulsed current (Jet-PECM) is a promising alternative for surface structuring of this material, because the resulting removal only depends on its electrochemical properties. Neither tool wear nor thermal or mechanical influence on the work piece is caused by this process. In this study the influence of current pulse parameters on the cross-sectional shape of straight-lined grooves machined with Jet- PECM in WC6Co was analyzed. Furthermore adequate machining strategies were derived and applied in order to generate surfaces with defined waviness.

关键词： Electrochemical Machining (ECM) Pulsed Electrochemical Machining (PECM) Electrolyte Jet Tungsten Carbide

来源：评论

学校读者我要写书评

暂无评论

Condition Monitoring of Piezoceramic Fibers During Joining by forming

引用

Procedia technology 2016年 26卷 144-151页

作者： W.-G. Drossel V. Wittstock S. Hensel M. Schmidt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Professorship for Adaptronics and Lightweight Design in Production Technische Universität Chemnitz 09107 Chemnitz Germany Professorship Machine Tools and Forming Technology Technische Universität Chemnitz 09107 Chemnitz Germany

Nowadays, piezoelectric transducers with sensor or actuator functionality are applied on the surface of components by bonding. New research activities enable a novel process chain for sensor integration in which piezoceramic fibers are integrated directly into the surface of metal sheets using joining by forming. Scope of the paper is to investigate a method for condition monitoring of the piezoceramic fibers during the joining process. Different test samples are prepared and studied by its inherent sensor function in terms of electrical impedance during various loads. As a result, a novel approach is presented for monitoring the preload status during the forming operation and detecting errors by electrical impedance spectroscopy. This method contributes to ensure a high-volume production.

关键词： piezoceramic fibers condition monitoring impedance spectroscopy joining by forming

来源：评论

学校读者我要写书评

暂无评论

Generation of Complex Surfaces by Superimposed Multi-dimensional Motion in Electrochemical Machining

引用

Procedia CIRP 2016年 42卷 384-389页

作者： Andreas Schubert Matthias Hackert-Oschätzchen André Martin Sebastian Winkler Danny Kuhn Gunnar Meichsner Henning Zeidler Jan Edelmann Professorship Micromanufacturing Technology Faculty of Mechanical Engineering Technische Universität Chemnitz 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany

In electrochemical machining the shape of the machined surface corresponds to the shape of the cathode and the applied electrical charge. In order to increase the flexibility of electrochemical machining for the generation of complicated surfaces, several investigations on the application of superimposed multi-dimensional motion were performed. In this study several possibilities for the application of superimposed multi-dimensional motions are shown and compared concerning the machining flexibility and tooling requirements. Detailed investigations were focused on Jet Electrochemical Machining (Jet-ECM) and Pulsed Electrochemical Machining (PECM). The results are discussed and compared with respect to these applications. The special characteristic of Jet-ECM is the high localization of electric current by continuously applying an electrolyte jet. Based on experiments of manufacturing plane surfaces, the variation of line spacing was derived as a suitable superimposed motion strategy. To realize this strategy, the cross-sectional profiles of planar Jet-ECM erosions were detected. The measured depths of these erosions were implemented in a mathematical model. To evaluate the developed model, various experiments for the generation of different complex surfaces were carried out in four steel materials. It could be demonstrated that the variation of the line spacing is suitable to generate complex surfaces and that the deviations of the produced geometries from the intended geometries are in a range of a few micrometers. In addition PECM, characterized by the application of voltage pulses combined with an oscillating cathode, was investigated. In this study a multi-dimensional motion based on a single-axis tool movement superimposed with a rotation axis is investigated experimentally. The superposition enables the generation of complex surfaces with helical symmetry while preserving the specific benefits of PECM. The machined samples show good surface quality and high di

关键词： jet electrochemical machining pulsed electrochemical machining Jet-ECM PECM closed electrolyte jet localized anodic dissolution motion strategies

来源：评论

学校读者我要写书评

暂无评论

Modeling of Heat Fluxes During Machining and Their Effects on Thermal Deformation of the Cutting Tool

引用

Procedia CIRP 2016年 46卷 611-614页

作者： Matthias Putz Gerhard Schmidt Ulrich Semmler Christian Oppermann Michael Bräunig Umut Karagüzel Institute for Machine Tools and Production Processes Chemnitz University of Technology 09010 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Mechanical Engineering Department Istanbul Technical University 34437 Istanbul Turkey

The heat fluxes generated by cutting processes lead to thermal deformations in the tools. Particularly, in precision machining it is essential to know the amount of the process heat and its distribution of heat fluxes into tool, workpiece and chips. This paper presents an extended methodology for the calculation of these heat fluxes in machining operations. Additionally, by comparison of experimental results with finite element simulations, the thermally caused tool center point (TCP) displacements in turn-milling operations are discussed. Furthermore, the influence of cooled air on TCP displacements is shown.

关键词： Machining Thermal Effects Process Heat Simulation Finite Element Method

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

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

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：