检索结果-内蒙古大学图书馆

18th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2018

作者： Georgi, Oliver Rentzsch, Hendrik Blau, Peter Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9780995775121

Machining small workpieces with large scale machine tools has several disadvantages such as high costs, low efficiency and higher sensitivity to errors. Miniaturizing the machine to workpiece scale is a suitable approach to overcome certain limitations. However, this measure also leads to significant changes in machine properties even if the kinematic structure remains unchanged. On the basis of a parallel kinematic machine tool the paper investigates size effects and machine characteristics during dimensioning and design process. Static stiffness of joint bearings and overall dynamic behaviour are analysed to derive and prove certain design measures. Furthermore the influence of miniaturization on structure synthesis and feed drive dimensioning is shown. The paper concludes with final design and specifications of the developed parallel kinematic machine tool. © 2018 CURRAN-CONFERENCE. All rights reserved.

关键词： machine tools

来源：评论

学校读者我要写书评

暂无评论

Dry-ED milling of micro-scale contours with high-speed rotating tungsten tube electrodes

引用

Procedia CIRP 2020年 95卷 533-538页

作者： E. Uhlmann I. Perfilov S. Yabroudi R. Mevert M. Polte Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin 10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin 10587 Germany

This paper presents machining results for dry-ED milling of micro-scale contours by use of a new machine tool, including a relaxation generator, designed for dry-EDM. To implement the dry-ED milling process tungsten tube electrodes were used. The gas is injected through the tubular tool electrode under high pressure. Additionally, a high-speed EDM spindle was used to overcome process instabilities and increase the material removal rate due to better flushing conditions. Further, fluid simulations of the flushing conditions are presented in this paper. It is found that the use of gaseous dielectrics enables much better machining results in terms of shape accuracy and tool wear. The simulations provide new insights in the flushing conditions when using gaseous dielectrics. The calculated fluid flow pattern shows a great agreement with the observed depositions of reattached molten material on the tool and workpiece surface. The results presented as well as the hardware introduced enable the industrial application of dry-EDM for the first time.

关键词： EDM Dry-EDM ED milling CFD flushing

来源：评论

学校读者我要写书评

暂无评论

Automatic bead position calculation for hem flange bonding

引用

Procedia Manufacturing 2019年 27卷 138-143页

作者： M. Eckert J. Weber B. Hecht W.-G. Drossel M. Rössinger Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Volkswagen Aktiengesellschaft Brieffach 011/1326 38436 Wolfsburg Germany

This article deals with improving the planning of hem flange bonding in the car body manufacturing process. Particularly during the ramp-up of the plant, great effort is put into ensuring that the generated adhesive bond meets the quality requirements. Here, several challenges occur in parallel. This ranges from the specific adhesive design, a result of multi-dimensional and individually curved car body parts, to the multi-stage process chain, where the associated manufacturing equipment is complex. This intricacy is countered by a discrete analysis of the adhesive continuum. Based on an established method, the location where the adhesive must be applied is computed under consideration of contiguous contours, disturbance variables and applicability by the projected dispensing system. For this reason the performance of the involved machines is examined. The results of this new method comprise a robot path along which an application system is guided, and control commands for the latter. Finally, a validation proves that this way, the adhesive application can be designed in a shorter period of time and in high quality at an early stage of plant design.

关键词： Computer automated process planning (CAPP) Robot Hem flange bonding

来源：评论

学校读者我要写书评

暂无评论

Die-sinking EDM of a SiC-boride-composite 19

Die-sinking EDM of a SiC-boride-composite

引用

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

作者： Uhlmann, E. Polte, J. Jahnke, C. Wolf, C.-S. Degenhardt, U. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany FCT Ingenieurkeramik GmbH Frankenblick Germany

ISBN: (纸本)9780995775145

Silicon carbide-based composites are highly demanded for industrial applications, like heat exchangers in corrosive environments. In consequence of the mechanical properties like high hardness H and brittleness, cutting processes are still challenging. An opportunity for processing difficult-to-cut materials with sufficient electrical conductivity σ is electrical discharge machining (EDM). In order to develop suitable machining technologies, known parameters for common material combinations can serve as a starting point. Hence, standard technologies from the database of a commercial die-sinking EDM machine tool were applied for machining a silicon carbide-boride-composite. The material removal rate QW and the arithmetical mean deviation Ra for finishing and roughing operations are observed. The formation of cracks and the extend of the typical deposition layer formed at the surface of the workpiece is analysed through scanning electron microscopy. While the material removal rate QW is increasing with higher discharge energies W in this investigation, the arithmetical mean deviation Ra is not dependent on this property. Furthermore, spalling is identified as main material removal mechanism occurring in this process. Overall, the machinability of silicon carbide-boride composites with EDM, applying commercial available parameter technologies, is successfully demonstrated. © 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

Investigating the influence of bending parameters on the springback behavior of ultra-high strength spring strips 26th

Investigating the influence of bending parameters on the spr...

引用

26th MEFORM Conference on Resource Efficient Materials and forming Technologies, 2018

作者： Richter, Karsten Reuther, Franz Müller, Roland Landgrebe, Dirk Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783035712971

The spring industry has to process ultra-high strength spring strips of the steel grade 1.4310 (X10CrNi18-8). Springback during bending is a limiting factor for resource-efficient production processes in the so-called stamping bending technology. This paper reports a mainly experimental investigation on the influence of bending parameters on the evolving springback of spring strips of the grade 1.4310 with tensile strengths TS = 1500-1800 MPa. © 2018 Trans Tech Publications, Switzerland.

关键词： Stamping

来源：评论

学校读者我要写书评

暂无评论

Potentials of Hydrogen Technologies for Sustainable Factory Systems

引用

Procedia CIRP 2021年 98卷 583-588页

作者： Christoph Imdahl Christine Blume Stefan Blume Sabrina Zellmer Michael Gensicke Christoph Herrmann Fraunhofer Institute for Surface Engineering and Thin Films IST Bienroder Weg 54E 38108 Braunschweig Germany Institute of Machine Tools and Production Technology Chair of Sustainable Manufacturing and Life Cycle Engineering Technische Universität Braunschweig Langer Kamp 19b 38106 Braunschweig Germany Robert Bosch Elektronik GmbH John-F.-Kennedy-Straße 43-53 38228 Salzgitter Germany

The industrial sector is the world’s second largest emitter of greenhouse gases, hence a methodology for decarbonizing factory systems is crucial for achieving global climate goals. Hydrogen is an important medium for the transition towards carbon neutral factories due to its broad applicability within the factory, including its use in electricity and heat generation and as a process gas or fuel. One of the main challenges is the identification of economically and environmentally suitable design scenarios, such as for the entire value chain for hydrogen generation and application. For example, the infrastructure for renewable electricity, hydrogen generation, hydrogen conversion (e.g. into synthetic fuels), storage and transport systems as well as application in the factory. Due to the high volatility of energy generation and the related dynamic interdependencies within a factory system, a valid technical, economic and environmental evaluation of benefits induced by hydrogen technologies can only be achieved using digital factory models. In this paper, we present a framework to integrate hydrogen technologies into factory systems. This enables decision makers to identify promising measures according to their expected impact and collect data for appropriate factory modelling. Furthermore, a concept for factory modelling and simulation is presented and demonstrated in a case study from the electronics industry, assessing the use of hydrogen for decentralized power and heat generation.

关键词： Digital Factory Carbon neutral factory Power-to-X Hydrogen Technologies Sustainable Factory Systems

来源：评论

学校读者我要写书评

暂无评论

Towards predictive quality in production by applying a flexible process-independent meta-model

引用

Procedia CIRP 2021年 104卷 1251-1256页

作者： Junjie Liang Lukas Pelzer Kai Müller Simon Cramer Christoph Greb Christian Hopmann Robert H. Schmitt RWTH Aachen University Laboratory for Machine Tools and Production Engineering Campus-Boulevard 30 52074 Aachen Germany RWTH Aachen University Institute for Plastics Processing Seffenter Weg 201 52074 Aachen Germany RWTH Aachen University Institut für Textiltechnik Otto-Blumenthal-Straße 1 52074 Aachen Germany Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 52074 Aachen Germany

Predictive Analytics is increasingly applied as a basis for decision-making in product and process optimization of manufacturing companies. In this context, Predictive Quality enables companies to make data-driven predictions of product quality, with data integration being one of the most significant challenges. This paper provides insights into exemplary applications of a flexible process-independent meta-model to integrate data for multi-step manufacturing processes. Three application use cases from different production domains are presented, demonstrating the meta-model’s applicability for Predictive Quality applications in manufacturing companies without restrictions regarding the product or manufacturing process.

关键词： Predictive Quality Process Data Production Data Meta-Model Data Analytics

来源：评论

学校读者我要写书评

暂无评论

Assessing the application based utility potential of new technologies

Assessing the application based utility potential of new tec...

引用

IEEE technology & Engineering Management Conference (TEMSCON)

作者： Ing. Günther Schuh Patrick Scholz Yuka Marie-Sophie Ando Chair of Production Engineering Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Aachen Germany Dept. of Technology Management Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (数字)9781728142241

ISBN: (纸本)9781728142258

Increasing competitive pressure in the course of globalization, accelerated technological change and the resulting disruption of existing business models are forcing companies to innovate faster, cheaper and more radically. A significant number of established manufacturing companies are facing this challenge by investing in new technologies apart from their core business to increase their innovativeness. Technologies as a sustainable differentiating feature become a relevant investment object and the early identification of high potential technologies a critical success factor. Currently, investment decisions for technologies are often based on the individual experience of the respective decision-makers. Person-dependent, implicit criteria are used for the evaluation within decision-making processes. This procedure is not feasible for the evaluation of new technologies outside a company's own core business and bears a high risk of misjudgment, due to the lack of experience and knowledge of the decision-makers. Furthermore, it is impossible to make investment decisions based on financial indicators such as the return on investment (ROI) at an early stage, since developments are only in the concept phase and high uncertainties prevail. Rather, decisions should be based on the potential, company-specific utility of technologies. Thus, a systematic and transparent evaluation approach is required, which allows an early assessment of the company-specific potential of technologies. This paper presents a model for the assessment of the company-specific utility potential of technologies in the early phases of the innovation process.

关键词： Technological innovation Companies Investment Utility theory Manufacturing Systematics Production

来源：评论

学校读者我要写书评

暂无评论

Function framework for describing digital technologies in the context of lean production

引用

Procedia CIRP 2020年 88卷 167-172页

作者： Georg Hoellthaler Frederic Meister Stefan Braunreuther Gunther Reinhart Fraunhofer Research Institution for Casting Composite and Processing Technology (IGCV) Provinostr. 52 86153 Augsburg Germany Institute for Machine Tools and Industrial Management (iwb) Technical University of Munich Boltzmannstr. 15 85748 Garching Germany

Intensifying challenges such as volatility, individualization and consequential complexity increasingly bring lean production systems to their performance limits. Using digital technologies serves as possible solution to overcome the limits of lean production and to enhance its capability of reducing waste within production processes. Therefore, a holistic and generic approach is required that allows to characterize digital technologies with respect to their effects on reducing waste in production processes. This paper introduces a function framework that describes digital technologies based on a function-oriented and impact-driven attribution concerning their effects on reducing waste and therefore on superordinate goals of lean production.

关键词： Lean production system (LPS) Digital technologies Information flow Information functions Information logistics

来源：评论

学校读者我要写书评

暂无评论

Methodology Concept for the Determination of the Idea-specific Requirement Space for the Execution of Radical Innovations

Methodology Concept for the Determination of the Idea-specif...

引用

IEEE technology & Engineering Management Conference (TEMSCON)

作者： Günther Schuh Paul Zeller Chair of Production Engineering RWTH Aachen University Lab. for Machine Tools and Production Engineering (WZL) Aachen Germany Department of Technology Management Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (数字)9781728142241

ISBN: (纸本)9781728142258

Due to increasing globalization and continuously shorter product life cycles, the pressure on companies to innovate is significant. Regarding this, companies do not lack in the basis for radical innovations, namely a wide variety of novel ideas. The challenge is rather to identify, evaluate and execute ideas with high success potential. At this, implicit, unfounded criteria are often used within the evaluation and selection of ideas which partly results in an elimination of highly potential ideas. Furthermore, companies show a lack of knowledge regarding the specific requirements for the implementation of an idea and corresponding innovation catalysts, e.g. the integration of complementors. These challenges result in a neglection of required resource support for promising ideas and, consequently, in failing at the exploitation of the full market potential. Against this background, this paper provides a conception of a methodology for the determination of the idea-specific requirement space for the implementation of radical innovations. The presented concept is subject of current research activities.

关键词： Technological innovation Companies Uncertainty Product development Research and development management Conferences Production

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：