检索结果-内蒙古大学图书馆

Empirical Modeling of Abrasive Waterjet Process for Controlled Depth Machining of Dense Segmented Ceramic Thermal Barrier Coatings

引用

Procedia CIRP 2021年 102卷 355-360页

作者： J.P. Borrmann M. Dadgar J.-E. Döring T. Herrig T. Bergs Siemens Energy Global GmbH & Co. KG Campus Boulevard 79 52074 Aachen Germany Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 52074 Aachen Germany Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Campus-Boulevard 30 52074 Aachen Germany

Abrasive waterjet (AWJ) controlled depth machining shows promise to be one of the most efficient non-conventional structuring techniques for dense segmented Thermal Barrier Coatings (STBC) on turbomachinery hot gas components made of Yttria-Stabilized Zirconia. Exemplary applications in the field of gas turbine technology are engraving of structures to optimize gas turbine performance and the stripping process of TBC within the repair process chain. As there are no comprehensive process models available, the development of an appropriate AWJ machining process is demanding. Thus, deeper process understanding and modeling need to be investigated. This paper shows an empirical modeling of AWJ process for controlled depth machining of dense segmented TBC material. The practical trials are based on a Design of Experiments (DoE). The investigated influencing parameters are water pressure, abrasive mass flow, feed rate, hatch distance and machining angle. The considered target variables are ablation depth and surface roughness. Furthermore, the process stability is investigated. The developed empirical model results in an acceleration of process parameter determinations.

关键词： Waterjet Machining Ceramics Modeling Design of Experiments (DoE) Segmented Thermal Barrier Coating

来源：评论

学校读者我要写书评

暂无评论

Requirements for Economic Analysis of 5G technology Implementation in Smart Factories from End-User Perspective

Requirements for Economic Analysis of 5G Technology Implemen...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Raphael Kiesel Robert H. Schmitt Fraunhofer Institute for Production Technology IPT Aachen Germany Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Aachen

ISBN: (数字)9781728144900

ISBN: (纸本)9781728144917

The estimated economic impact of 5G technology in production industry is immense. Until 2030, worldwide production industry gross domestic product is expected to by up to $740 billion [4]. Providing low latencies, high data transmission rates and the possibility of operating many devices simultaneously in narrowly restricted radio cells, 5G is expected to meet the demands of networked production systems and has great potential to accelerate the ongoing digital transformation. Despite these prospected advantages, benefits of integrating 5G technology in a production process can barely be quantified yet. 40 % of enterprises cite poor measurability of economic benefits of 5G for their specific processes as key concern [6]. Thus, improvement potential for production processes and their monetary benefit need to be quantified in order to provide decision-makers with a sound base for their investment decisions. This paper describes the requirements and a first approach of a model to quantify economic potential of 5G technology in production. Therefore, existing approaches and models to quantify economic benefits of 5G technology and of digitalization in production in general are analyzed. Then, the model is derived. In the end, future research needs are given.

关键词： Production 5G mobile communication Economics Industries Analytical models Smart manufacturing Investment

来源：评论

学校读者我要写书评

暂无评论

Micro-cutting of a MMC-composite for enhanced injection moulds 19

Micro-cutting of a MMC-composite for enhanced injection moul...

引用

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

作者： Uhlmann, E. Polte, M. Hein, C. Polte, J. Jahnke, C. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775145

tools for micro-injection moulding are currently made of hardened steel. These tools are exposed to high local loads, which significantly reduce the injection moulding tool life time tT. Furthermore, the occurring wear of the milling tool during machining of hardened steel leads to reduced surface roughness Ra and geometrical accuracy GF. Copper and aluminium alloys as mould materials provide an alternative to hardened steel with advantages regarding material removal rate QW and wear of the milling tool, but with a significantly reduced life time of the injection moulding tool tT. Until now, the combination of a good machinability and high wear resistance cannot be achieved. The approach, presented in this paper consists of an easy to machine material and the development of a wear resistant metal-matrix-composite (MMC) material layer with a hardness of up to 3,000 HV. Therefore, the pre-machined test specimens made of aluminium-bronze are coated by laser dispersing with wolfram-carbide-particles W2C-WC. Furthermore, for the finishing machining of the coated moulds, a cutting technology for the machining of W2C-WC-particles was developed. The verification of the developed technology was performed with an injection moulding process based on carbon-fibre reinforced thermoplastic material. By means of documented machining efforts, the quality indicators geometrical accuracy GF and surface roughness Ra as well as occurring tool wear, the feasibility of the developed technology was demonstrated. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Injection molding

来源：评论

学校读者我要写书评

暂无评论

Method for Capacity Planning of Changeable Production Systems in the Electric Drives Production

Method for Capacity Planning of Changeable Production System...

引用

International Electric Drives Production Conference (EDPC)

作者： Jens Niemann Andreas Schlegel Matthias Putz BMW AG Munich Germany Machine Tools Production Systems and Machining Fraunhofer-Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (数字)9781728143194

ISBN: (纸本)9781728143200

Market growth and technological uncertainties characterize the electro-mobility. High emission standards, fossil fuel scarcity, environmental protection, and political initiatives promote this development. Besides, factors such as customer behavior, infrastructure, new competitors, and technological developments induce high volatility in forecasted market volumes. Due to these uncertainties, production systems of electrified vehicles require a combination of changeable production systems and flexibility measures. The production capacity of changeable production systems is currently determined by a conventional capacity planning method, which does not integrate the degrees of freedom conferred by changeability. In this publication, we present a new capacity planning method of changeable production systems in electro-mobility. Changeability comprises pre-defined measures that change either the capacity or the technological spectrum of productions by an investment. A total of five changeability drivers exist, thereof we consider scalability and universality. Scalability in this context refers to the technical, local, and personnel possibilities to expand and reduce factory elements and production systems. Universality focuses on technological production properties, in particular, the ability to meet different production and technology requirements. We define specific changeability options for both drivers. Moreover, we integrate these in production capacity planning, which leads to various production configurations. Additionally, we evaluate the monetary impact and the resulting flexibility of each configuration at any time within the observation period using the real options approach. We choose this approach to integrate market uncertainties in the decision- making process. Further, a Monte Carlo simulation validates all configurations showing positive option values, and we determine a final capacity plan. We apply the method to a production system for electric drives

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ultra-precision-milling of silicon by means of single crystal diamond tools 19

Ultra-precision-milling of silicon by means of single crysta...

引用

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

作者： Uhlmann, E. Polte, M. Rolon, D.A. Kühne, S. Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany

ISBN: (纸本)9780995775145

Silicon is an important material often employed on most of micro-electro mechanical systems (MEMS), integrated circuits, microchips, and micro-fluidic devices. Therefore, strategies and process parameters to machine those planar 2.5-D geometries of silicon are essential. Moreover, silicon belongs to the group of hard-brittle materials, which means that it is very likely to originate cracks during the milling operations as a result of the intermittent interaction of the cutting edge and the silicon surface. Besides, the machining of silicon results on severe tool wear. The ductile-brittle transition and tool wear reduction of the silicon-milling are aspects still not completely investigated. Consequently, this paper aims at finding the proper parameter range for ductile ultra-precision milling (UP-milling) of 2.5-D silicon geometries employing single crystal diamond cutting tools. Furthermore,the evaluation the tool wear after the process is a crucial part of the investigations. In order to fulfil such knowledge gap, single groove experiments are proposed. The milling process to generate those grooves is monitored by means of force measurements. Also, surface aspects of the machined grooves are measured through white light interferometry (WLI). For evaluating tool wear, dry UP-milling investigations are conducted and images of the cutting edges are taken by means of a scanning electron microscope (SEM). The experiments show that the machining of silicon is feasible and the ductile material removal is possible. Moreover, the process forces Fpr generated by the UP-milling process of single crystal silicon are able to be employed for monitoring and avoid the transition from ductile to brittle material removal. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Diamond cutting tools

来源：评论

学校读者我要写书评

暂无评论

Non-cuttable material created through local resonance and strain rate effects (vol 10, 11539, 2020)

引用

SCIENTIFIC REPORTS 2020年第1期10卷 1-24页

作者： Szyniszewski, Stefan Vogel, Rene Bittner, Florian Jakubczyk, Ewa Anderson, Miranda Pelacci, Manuel Chinedu, Ajoku Endres, Hans-Josef Hipke, Thomas Durham University Durham United Kingdom Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut WKI Hannover Germany Leibniz University Hannover Institute of Plastics and Circular Economy IKK Garbsen Germany University of Surrey Guildford United Kingdom University of Stirling Stirling United Kingdom

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Optimizing development time through hybrid commissioning of control software

引用

Procedia CIRP 2019年 79卷 450-455页

作者： Christoph Allmacher Marco Schumann Philipp Klimant Matthias Putz Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

In modern intralogistics, automated guided vehicles (AGV) are used to optimize the material flow. To minimize the time to market it is necessary to develop software and hardware simultaneously. Therefor this paper introduces the hybrid-development-and-commissioning method of control software for AGVs. It results in a validated virtual prototype that can be used to verify swarm behavior. The methods procedure is demonstrated for a light detection and ranging sensor. Firstly, the sensor is modelled for software-in-the-loop testing. Gradually switching to the physical AGV prototype, the paper further presents the validation process of the sensor model.

关键词： Virtual reality Simulation Virtual commissioning

来源：评论

学校读者我要写书评

暂无评论

Evolving the Digital Industrial Infrastructure for Production: Steps Taken and the Road Ahead

arXiv

引用

arXiv 2023年

作者： Pennekamp, Jan Belova, Anastasiia Bergs, Thomas Bodenbenner, Matthias Bührig-Polaczek, Andreas Dahlmanns, Markus Kunze, Ike Kröger, Moritz Geisler, Sandra Henze, Martin Lütticke, Daniel Montavon, Benjamin Niemietz, Philipp Ortjohann, Lucia Rudack, Maximilian Schmitt, Robert H. Vroomen, Uwe Wehrle, Klaus Zeng, Michael Communication and Distributed Systems RWTH Aachen University Aachen Germany Laboratory for Machine Tools and Production Engineering RWTH Aachen University Aachen Germany Fraunhofer IPT Aachen Germany Foundry Institute RWTH Aachen University Aachen Germany Laser Technology RWTH Aachen University Aachen Germany Data Stream Management and Analysis RWTH Aachen University Aachen Germany Security and Privacy in Industrial Cooperation RWTH Aachen University Aachen Germany Information Management in Mechanical Engineering RWTH Aachen University Aachen Germany

The Internet of Production (IoP) leverages concepts such as digital shadows, data lakes, and a World Wide Lab (WWL) to advance today’s production. Consequently, it requires a technical infrastructure that can support the agile deployment of these concepts and corresponding high-level applications, which, e.g., demand the processing of massive data in motion and at rest. As such, key research aspects are the support for low-latency control loops, concepts on scalable data stream processing, deployable information security, and semantically rich and efficient long-term storage. In particular, such an infrastructure cannot continue to be limited to machines and sensors, but additionally needs to encompass networked environments: production cells, edge computing, and location-independent cloud infrastructures. Finally, in light of the envisioned WWL, i.e., the interconnection of production sites, the technical infrastructure must be advanced to support secure and privacy-preserving industrial collaboration. To evolve today’s production sites and lay the infrastructural foundation for the IoP, we identify five broad streams of research: (1) adapting data and stream processing to heterogeneous data from distributed sources, (2) ensuring data interoperability between systems and production sites, (3) exchanging and sharing data with different stakeholders, (4) network security approaches addressing the risks of increasing interconnectivity, and (5) security architectures to enable secure and privacy-preserving industrial collaboration. With our research, we evolve the underlying infrastructure from isolated, sparsely networked production sites toward an architecture that supports high-level applications and sophisticated digital shadows while facilitating the transition toward a WWL. © 2023, CC BY.

关键词： Network security

来源：评论

学校读者我要写书评

暂无评论

Cutting force predictionin micro-milling considering the cutting edge micro-geometry 19

Cutting force predictionin micro-milling considering the cut...

引用

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

作者： Uhlmann, E. Polte, J. Wiesner, H.M. Kuche, Y. Polte, M. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775145

The micro-milling process is used for a wide range of materials and enables the manufacturing of complex geometries with micro-features. One important factor for the tool life is the cutting force Fc, which depends on the applied technology, process parameters and cutting edge micro-geometry. High cutting forces Fc can lead to tool breakage in the transition between the shank and the cutting part of cemented carbide end mills. The prediction of cutting forces Fc in micro-milling processes through cutting force models could potentially decrease the hazard of tool breakage. By including the cutting edge radius rβ into the prediction model, additional correction factors can be avoided. Therefore, further knowledge about the applicability of those models for the micro-milling process with chip thickness h © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Milling (machining)

来源：评论

学校读者我要写书评

暂无评论

Manufacturing of graphite electrodes with high geometrical requirements 19

Manufacturing of graphite electrodes with high geometrical r...

引用

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

作者： Uhlmann, E. Kuche, Y. Polte, J. Polte, M. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9780995775145

Graphite is widely used for the die-sinking electrical discharge machining (EDM) process, especially for the roughing process. For the manufacturing of graphite electrodes the milling process is mainly used. The process enables fast processing times tP and high geometrical flexibility. In consequence of the cutting behaviour of graphite micro-components with geometrical features can be manufactured. In this contribution the manufacturing of micro-pins and bridges with aspect ratios of A = 1:50 were machined with diamond coated milling tools. By variation of the depth of cut ap and the width of cut ae it can be shown that the influence of the depth of cut ap is quite bigger than the influence of the width of cut ae. This results in consequence of the higher stability of the geometrical features by improved force distribution. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Graphite electrodes

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：