检索结果-内蒙古大学图书馆

11th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2011

作者： Uhlmann, E. Langmack, M. Garn, R. Oberschmidt, D. Fecher, J. Rosiwal, S.M. Singer, R.F. Institute for Machine Tools and Factory Management Technische Universität Berlin Germany Fraunhofer Institute for Production Systems and Design Technology Germany Continental Automotive GmbH Germany University of Erlangen-Nuremberg Erlangen Germany

ISBN: (纸本)9780955308291

Due to its thermal working principle and its independency of the work piece's mechanical properties, Micro Electrical Discharge Machining (μEDM) is predestined for fabricating holes with diameters of below dh = 200 μm at minimum tolerances of ± 1 μm. Besides the use of special pulse generators providing discharge currents of down to ie = 100 mA at discharge durations of te ≥ 40 ns an important process factor is the tool electrodés material which has a great influence on the machining time and result, and the electrodés wear [1, 2, 3]. To assure an efficient process at a high accuracy and a low tool wear, basic properties demanded for electrodes are an excellent electrical and thermal conductivity as well as a high melting temperature, and a high mechanical strength.

关键词： Electric discharges

来源：评论

学校读者我要写书评

暂无评论

Micromanufacturing Of Hard To machine Materials By Physical And Chemical Ablation Processes

引用

AIP Conference Proceedings 2011年第1期1315卷 1279-1284页

作者： A. Schubert J. Edelmann S. Gross H. Zeidler G. Meichsner M. Hackert N. Wolf J. Schneider aFraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz 09126 Germany bChair Micromanufacturing Technology Chemnitz University of Technology Chemnitz 09107 Germany

Miniaturization leads to high requirements to the applied manufacturing processes especially in respect to the used hard to machine materials and the aims of structure size and geometrical accuracy. Traditional manufacturing processes reach their limits here. One alternative for these provide thermal and chemical ablation processes. These processes are applied for the production of different microstructures in different materials like hardened steel, carbides and ceramics especially for medical engineering and tribological applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Load-Adapted Design of Generative Manufactured Lattice Structures

引用

Physics Procedia 2011年 12卷 385-392页

作者： Gunther Reinhart Stefan Teufelhart Fraunhofer Institute for Machine Tools and Forming Technologies (IWU) Project Group for Resource-Efficient Mechatronic Processing Machines (RMV) Beim Glaspalast 5 86153 Augsburg Germany

Additive layer manufacturing offers many opportunities for the production of lightweight components, because of the high geometrical freedom that can be realized in comparison to conventional manufacturing processes. This potential gets demonstrated at the example of a bending beam. Therefore, a topology optimization is performed as well as the use of periodically arranged lattice structures. The latter ones show the constraint, that shear forces in the struts reduce the stiffness of the lattice. To avoid this, the structure has to be adapted to the flux of force. This thesis is supported by studies on a torqueloaded shaft.

关键词： Additive Layer Manufacturing (ALM) Selective Laser Melting (SLM) Lightweight Design Lattice Structures

来源：评论

学校读者我要写书评

暂无评论

Micro Machining of Different Steels with Closed Electrolytic Free Jet

引用

AIP Conference Proceedings 2011年第1期1353卷 1337-1343页

作者： M. Hackert‐Oschätzchen G. Meichsner H. Zeidler M. Zinecker A. Schubert aChair Micromanufacturing Technology Faculty of Mechanical Engineering TU Chemnitz 09107 Chemnitz Germany bFraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany

Electrochemical Machining (ECM) with closed electrolytic free jet (Jet‐ECM) is an innovative procedure in micro manufacturing technology which is based on anodic dissolution of metallic work pieces. Main advantage of Jet‐ECM in comparison to other ECM processes is the restriction of the electric current to a limited area by the jet. Micro structured surfaces and complex three‐dimensional micro geometries can be machined by help of different nozzle movements. In this study the Jet Electrochemical Machining is used to generate micro cavities in different steels to investigate the influence of the material properties on the removal process. Current efficiency, machined geometry and surface properties of the processed areas were analyzed and compared.

关键词：

来源：评论

学校读者我要写书评

暂无评论

How to prevent product piracy using a new TRIZ-based methodology

引用

Procedia Engineering 2011年 9卷 391-401页

作者： Günther Schuh Christoph Haag Laboratory for Machine Tools and Production Engineering RWTH Aachen Germany Fraunhofer Institute for Production Technology IPT 52074 Aachen Germany

In recent years, product and brand piracy has significantly gained importance and risen to a worldwide mass phenomenon. Companies are gradually facing up to the challenge and taking action. Besides legal measures, an increasing number of firms is also willing to implement strategic and technical measures into their organisations respectively products. But the potential of these approaches is so far only being exploited to a limited extent, mainly due to lacking knowledge regarding the functionality and benefits of technical know-how protection mechanisms. Focusing on this issue, the paper introduces the so called Product Piracy Conflict Matrix (PPC Matrix). The PPC Matrix methodically resembles the well-established TRIZ Contradiction Matrix and is also based on Neemann's work (2007), who recently introduced a new approach for product-based imitation protection including a set of technical, strategic, organisational and legal instruments. The PPC Matrix combines both approaches to a new framework to help companies to find expedient measures against product piracy. The article introduces the new methodology by giving detailed insights into its theoretical backbone, providing practitioner's guidance and outlining examples from industry practice.

关键词： Product piracy Product imitation technology know-how protection Contradiction matrix Ideality approach

来源：评论

学校读者我要写书评

暂无评论

Micro Electro Discharge Machining of Electrically Nonconductive Ceramics

引用

AIP Conference Proceedings 2011年第1期1353卷 1303-1308页

作者： A. Schubert H. Zeidler N. Wolf M. Hackert aChair Micromanufacturing Technology Faculty of Mechanical Engineering Chemnitz University of Technology 09107 Chemnitz Germany bFraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

EDM is a known process for machining of hard and brittle materials. Due to its noncontact and nearly forceless behaviour, it has been introduced into micro manufacturing and through constant development it is now an important means for producing high‐precision micro geometries. One restriction of EDM is its limitation to electrically conducting *** many applications, especially in the biomedical field, make use of the benefits of ceramic materials, such as high strength, very low wear and biocompatibility. Common ceramic materials such as Zirconium dioxide are, due to their hardness in the sintered state, difficult to machine with conventional cutting techniques. A demand for the introduction of EDM to these materials could so far not be satisfied because of their nonconductive *** the Chemnitz University of technology and the fraunhofer IWU, investigations in the applicability of micro‐EDM for the machining of nonconductive ceramics are being conducted. Tests are undertaken using micro‐EDM drilling with Tungsten carbide tool electrodes and ZrO2 ceramic workpieces. A starting layer, in literature often referred to as ‘assisting electrode’ is used to set up a closed electric circuit to start the EDM process. Combining carbon hydride based dielectric and a specially designed low‐frequency vibration setup to excite the workpiece, the process environment can be held within parameters to allow for a constant EDM process even after the starting layer is machined. In the experiments a cylindrical 120 μm diameter Tungsten carbide tool electrode and Y2O3‐ and MgO‐ stabilized ZrO2 worpieces are used. The current and voltage signals of the discharges within the different stages of the process (machining of the starting layer, machining of the base material, transition stage) are recorded and their characteristics compared to discharges in metallic material. Additionally, the electrode feed is monitored. The influences of the process parameters are analysed wi

关键词：

来源：评论

学校读者我要写书评

暂无评论

Structural analysis of artificial skin equivalent

Structural analysis of artificial skin equivalent

引用

European Conference on Biomedical Optics, ECBO 2011

作者： Schmitt, Robert Marx, Ulrich Walles, Heike Schober, Lena Laboratory for Machine Tools and Production Engineering WZL RWTH Aachen University Steinbachstrasse 19 52074 Aachen Germany Fraunhofer Institute for Production Technology IPT Steinbachstr 17 52074 Aachen Germany Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB Nobelstr. 12 70569 Stuttgart Germany

ISBN: (纸本)9780819486837

Artificial skin equivalents ASEs based on primary fibroblasts and keratinocytes show a high batch variance in their structural and morphological characteristics. Due to biological fluctuations and variable donor age, the growth processes of 3D tissue structure show a non constant quality. Since theses ASEs are used as testing system for chemicals, pharmaceuticals or cosmetics it is of major interest to know detailed and significant characteristics about each individual ASE. Until now, the microscopic analysis process is based on the destructive preparation of histologies allowing only the characterization on a random basis. In this study we present analytical methods to characterise each individual ASE by Optical Coherence Tomography OCT in combination with image processing tools. Therefore, we developed a fully automated OCT device, that performs automatic measurements of microtiter plates MTPs holing the ASEs in a sterile environment. We developed image processing algorithms to characterize the surface structure which may function as an indicator for defects in the epidermal stratum corneum. Further, we analysed the tomographic morphological structure of the ASEs. The results show, that variances in the growth state as well different collagen formation is detectable. In combination with dynamic threshold levels, we found, that OCT is a well suited technology for automatically characterizing artificial skin equivalents and may partly substitute the preparation of histologies. © 2011 SPIE-OSA.

关键词： Optical tomography

来源：评论

学校读者我要写书评

暂无评论

Integrated piezoelectric actuators in deep drawing tools to reduce the try‐out

引用

AIP Conference Proceedings 2011年第1期1353卷 189-194页

作者： Reimund Neugebauer Patrick Mainda Matthias Kerschner Welf‐Guntram Drossel Hans‐Jürgen Roscher aFraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Stravgβe 88 D‐09126 Chemnitz bAUDI AG D‐85045 Ingolstadt

Tool making is a very time consuming and expensive operation because many iteration loops are used to manually adjust tool components during the try‐out process. That means that trying out deep drawing tools is 30% of the total costs. This is the reason why an active deep drawing tool was developed at the fraunhofer institute for machine tools and forming technology IWU in cooperation with Audi and Volkswagen to reduce the costs and production rates. The main difference between the active and conventional deep drawing tools is using piezoelectric actuators to control the forming process. The active tool idea, which is the main subject of this research, will be presented as well as the findings of experiments with the custom‐built deep drawing tool. This experimental tool was designed according to production requirements and has been equipped with piezoelectric actuators that allow active pressure distribution on the sheet metal flange. The disposed piezoelectric elements are similar to those being used in piezo injector systems for modern diesel engines. In order to achieve the required force, the actuators are combined in a cluster that is embedded in the die of the deep drawing tool. One main objective of this work, i.e. reducing the time‐consuming try‐out‐period, has been achieved with the experimental tool which means that the actuators were used to set static pressure distribution between the blankholder and die. We will present the findings of our analysis and the advantages of the active system over a conventional deep drawing tool. In addition to the ability of changing the static pressure distribution, the piezoelectric actuator can also be used to generate a dynamic pressure distribution during the forming process. As a result the active tool has the potential to expand the forming constraints to make it possible to manage forming restrictions caused by light weight materials in future.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Design methodology for innovative hybrid manufacturing technologies

Design methodology for innovative hybrid manufacturing techn...

引用

2011 17th International Conference on Concurrent Enterprising, ICE 2011

作者： Roderburg, Andreas Gerhardt, Kai Hinke, Christian Park, Hong-Seok Buchholz, Steffen Klocke, Fritz Laboratory for Machine Tools and Production Engineering WZL RWTH Aachen University Steinbachstr. 19 52074 Aachen Germany Institute of Metal Forming IBF RWTH Aachen University Intzestr. 10 52056 Aachen Germany Fraunhofer Institute of Laser Technology ILT Steinbachstr. 15 52074 Aachen Germany School of Mechanical and Automotive Engineering University of Ulsan Korea Republic of

ISBN: (纸本)9783943024050

Current research activities in the field of manufacturing technology design increasingly focus on integrated approaches for process performance enhancements. As in many process development activities, systematic design methodologies are either not applied or even unknown in such instances. The main problem in such research efforts of finding integrated solutions is getting the relevant information or knowledge. The technology knowledge which has to be integrated for such new technology designs often is not available. Thus the availability of knowledge about the mechanisms of different manufacturing processes has to be improved in order to find new interdisciplinary (hybrid) process solutions. This article introduces a methodology approach for a systematic design of integrated technology solutions such as hybrid manufacturing processes. © 2011 The Authors.

关键词： Availability

来源：评论

学校读者我要写书评

暂无评论

Identifying,Analyzing and Evaluating Risks of Service Development A Quality-oriented Approach

Identifying,Analyzing and Evaluating Risks of Service Develo...

引用

2011 International Conference on Innovation,Management and Service （ICIMS 2011）

作者： Robert Schmitt Sven Schumacher Fraunhofer Institute for Production Technology IPT AachenGermany Laboratory for Machine Tools and Production Engineering WZL of the RWTH Aachen Germany

Services offer a great innovation potential due to their adaptability to individual customer *** many companies meet the challenge to consider customer-driven innovation ideas in a way that market-ready services match the customers' *** are needed,which allow for identifying,analyzing and evaluating the risks that come along with the development of innovative *** with the knowledge about the needs of the customer an evaluation of the innovation ideas should be *** evaluation is the basis for the decision,which innovations are brought to *** aim is to develop a concept that allows companies in a simple way to identify,analyze and evaluate potential risks that arise in the implementation of innovative *** addition,a comprehensive catalogue of possible risk factors is created that is of meaning in the service development.

关键词： Service,Innovation,Risk Management,Quality Management

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：