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检索条件"机构=Institute of Machine Tools and Production Engineering"

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OPTICAL EFFECTS DURING IN-SITU FABRICATION OF THERMOPLASTIC SANDWICH STRUCTURES USING LASER-BASED THERMOPLASTIC AUTOMATED FIBER PLACEMENT 10

OPTICAL EFFECTS DURING IN-SITU FABRICATION OF THERMOPLASTIC ...

引用

10th Composites and Advanced Materials Expo, CAMX 2024

作者： Denkena, Berend Schmidt, Carsten Schmitt, Christopher Kaczemirzk, Maximilian Institute of Production Engineering and Machine Tools Leibniz University Hannover Lower Saxony Hannover Germany Institute of Production Engineering and Machine Tools Leibniz University Hannover Lower Saxony Stade Germany

ISBN: (纸本)9781934551462

This work presents a novel concept for the in-situ production of thermoplastic sandwich structures using laser-based thermoplastic automated fiber placement (TAFP). Thermoplastic carbon fiber reinforced tapes are deposited on a thermoplastic foam core for the additive application of sandwich cover layers. In order to form a cohesive bond between the applied cover layer and the foam core, the two joining partners must be in a molten state. The heating process and the resulting temperature distributions are significantly influenced by the laser power absorbed within the TAFP heating zone. In order to gain a basic understanding of the optical interactions, optical investigations are carried out on carbon fiber-reinforced low-melt polyaryletherketone (CF/LMPAEK) tapes by TORAY and a thermoplastic polyetherimide (PEI) closed-cell foam R82.110 by AIREX with regard to reflection, absorption and transmission. The results are then implemented in an optical ray tracing model to predict absorbed power when depositing tapes onto a foam core. Modeled power distributions show that the tapes absorb way more radiation compared to the foam core. However, radiation reflected from the foam shows a very positive influence on the laser radiation absorbed by the fed tapes near the nip point. Copyright 2024. Used by CAMX – The Composites and Advanced Materials Expo.

关键词： Carbon fiber reinforced plastics

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Multidimensional position-based monitoring of machining using references of multiple machine tools 17

Multidimensional position-based monitoring of machining usin...

引用

17th CIRP Conference on Intelligent Computation in Manufacturing engineering, CIRP ICME 2023

作者： Denkena, Berend Klemme, Heinrich Stiehl, Tobias H. Institute of Production Engineering and Machine Tools Leibniz Universitat Hannover Garbsen30823 Germany

Tool condition monitoring systems are a prerequisite for autonomous production. However, monitoring small series is challenging as systems usually require references of correct processes for parameterization. As an alternative, these references can be sourced from other machine tools that execute similar processes. Unfortunately, actual processes vary among machine tools, despite machine tools using identical NC-instructions. This work introduces a novel multidimensional position-based online monitoring approach that is designed to overcome process variations among machine tools. This approach utilizes dynamic time warping to match the multidimensional tool paths of machine tools. The results include monitoring of pocket milling on three machine tools using process forces sourced from one, or multiple, other machine tools. A comparison demonstrates that position-based limits for online monitoring, rather than time-based limits, are better suited for transfer among machine tools. © 2024 Elsevier B.V.. All rights reserved.

关键词： Fleet operations

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Influence of process parameters on machining of extruded and additive produced green carbide blanks 57

Influence of process parameters on machining of extruded and...

引用

18th IFAC Workshop on Time Delay Systems, TDS 2024

作者： Denkena, Berend Bergmann, Benjamin Relard, Andreas Geschwind, Thomas Institute of Production Engineering and Machine Tools An der Universität 2 Garbsen30823 Germany

In this study investigates of the influence of process parameters on the chipping behavior of cemented carbide greens are carried out. Machining was performed on extruded and additive manufactured green carbide blanks using a plane test bench. It was shown, that the crack length mainly depends on the undeformed chip thickness. The results also indicate that the surface roughness is affected by the orthogonal rake angle and depth of cut. Additionally, the printing orientation has an impact on the machined surface. Cutting forces are also influenced by the undeformed chip thickness. The orthogonal rake angle influences the crack length of the workpieces. Due to this, the process for green machining can be optimized in order to reduce the surface and subsurface damage for extruded and non-debound additive manufactured green. © 2024 The Authors.

关键词： Carbide cutting tools

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Effect of process parameters during wire arc additive manufacturing (WAAM) and mechanical finishing on the surface zone properties 7

Effect of process parameters during wire arc additive manufa...

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7th CIRP Conference on Surface Integrity, CSI 2024

作者： Denkena, Berend Wichmann, Marcel Pillkahn, Philipp Institute of Production Engineering and Machine Tools An der Universität 2 Garbsen30823 Germany

Additive manufacturing processes for the production of large structural components, such as wire arc additive manufacturing (WAAM), offer great manufacturing potential due to their flexibility and design freedom, e.g. for the automotive industry. In order to achieve the desired surface and properties of the surface zone, additive manufacturing is usually followed by mechanical finishing. In this paper, the influence of the process parameters during WAAM and deep rolling (DR) on the residual stresses and the lifetime of AlSi12 components is investigated. Knowledge of the interactions between the process parameters in WAAM and DR as well as their effect on the surface zone properties and the application behavior is elementary. This enables the prediction of the component properties and quality. With the help of the appropriate selection of the process parameters, the residual stress state and the service life can be increased in such a way that components with high fatigue strength can be manufactured. This results in an average increase in service life of up to 17.8 times. © 2024 The Authors. Published by Elsevier B.V.

关键词： Residual stresses

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Numerical analysis of torques generated in a propulsion system using eddy currents phenomenon 23

Numerical analysis of torques generated in a propulsion syst...

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5th International Conference on Robotics Systems and Automation engineering, RSAE 2023

作者： Krygier, Michal Zak, Pawel Podsȩdkowski, Leszek Institute of Machine Tools and Production Engineering Lodz University of Technology Poland

ISBN: (纸本)9781450398510

Abstract. In this paper, we discuss the development of the device used for the automatic balancing of rotary units in motion. It contains a short description of the problem of rotary units getting unbalanced and possible measures to solve the named issue. It presents a short description of the developed device along with its work principle. The further part of the text focuses on the description of the modeling and analysis method of key propulsion elements of the system, which utilizes the eddy current phenomenon as a principle of work. The obtained results are discussed and the conclusions are drawn. The performed analysis proves that it is possible to create a device that enables pointed actions using developed methods. Finally, plans for further development are shortly presented and discussed. © 2023 ACM.

关键词： Numerical analysis

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Human jaw rehabilitation reinvented 23

Human jaw rehabilitation reinvented

引用

5th International Conference on Robotics Systems and Automation engineering, RSAE 2023

作者： Zak, Pawel Twardziak, Hubert Institute of Machine Tools and Production Engineering Lodz University of Technology Lodz Poland

ISBN: (纸本)9781450398510

In this paper, we discuss the design of a device for the rehabilitation of the human jaw. The work contains an analysis of the literature in terms of devices for the rehabilitation of the jaw available in the market. Concepts for solving the problem are presented based on the literature. The work also includes strength tests of the designed device and tests of the constructed device in terms of its functionality, using a human jaw. Based on the conducted research, conclusions are drawn. The summary of the work includes all observations concerning the presented problem and presents the aspects that can be improved, as well as a proposal to conduct further research. © 2023 ACM.

关键词： Computer programming

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Numerical Simulation Approach of Deep Rolling of AISI 52100 at Elevated Temperature 11

Numerical Simulation Approach of Deep Rolling of AISI 52100 ...

引用

11th CIRP Global Web Conference, CIRPe 2023

作者： Breidenstein, Bernd Bergmann, Benjamin Heikebrügge, Steffen Nordmeyer, Henke Institute of Production Engineering and Machine Tools Leibniz University Hannover An der Universitaet 2 Garbsen30823 Germany

Hard turn rolling is a hybrid manufacturing process that affects the surface integrity of hardened components, aiming to enhance the lifespan of components such as rolling bearings. Hard turn rolling combines the thermal influence of hard turning with a subsequent deep rolling process to modify the properties of the surface and surface near layer. To better understand the effects of deep rolling on AISI 52100 at elevated temperature that are generated by the hard turning process, finite element simulations were conducted to analyze the surface formation at elevated temperatures. These simulations enable the estimation of the workpiece surface, guiding the optimal positioning of the deep rolling tool in alignment with the hard turning process. However, the results indicate that there is a buildup observed in the simulation, which was not detected in the experiments. The width of the rolling tracks in the simulation at different specimen temperatures of 20°C, 200°C, and 400°C does not exhibit significant differences. Only the rolling pressure has an influence on the width of the rolling tracks. By controlling the parameters of hard turn rolling, further investigations are possible to achieve enhanced surface and subsurface properties and improved performance of the hardened components in the future. © 2023 The Authors. Published by Elsevier B.V.

关键词： Roller bearings

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Systematic Evaluation of Hybrid Portfolios for Solution Providers in machinery engineering

Systematic Evaluation of Hybrid Portfolios for Solution Prov...

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2024 Portland International Conference on Management of engineering and Technology, PICMET 2024

作者： Riesener, Michael Keuper, Alexander Bobmann, Carsten Schulz-Isenbeck, Timm Schuh, Gunther RWTH Aachen University Laboratory for Machine Tools and Production Engineering WZL Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (纸本)9781890843458

The change from traditional manufacturers to solution providers represents a comprehensive business reorientation. As a solution provider, manufacturing companies emphasize on the customer's benefit. Through the combination of physical prod-ucts, software and services, individual solutions are provided for the customer in order to achieve the greatest possible added value. The transformation has a particular impact on the structure and composition of traditional portfolios in machinery engineering, since new software and service components are gradually added. Therefore, portfolio evaluation methods need to address hybrid portfolios in order to manage the transformation effectively. Ex-isting portfolio management approaches are limited to structuring physical product portfolios only. Thus, this paper develops a new methodology to evaluate hybrid portfolios. A comprehensive framework is employed integrating portfolio evaluation techniques and technology management principles to analyze and op-timize hybrid portfolios. The evaluation comprises two principal evaluation fields, which consider both external market and inter-nal perspectives to identify strategic directions for portfolio and technology management. By systematizing the portfolio evaluation, the results contribute to the transformation into solution pro-viders, encompassing increasing software and services. © 2024 PICMET.

关键词： Investments

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Establishing Sustainable Business Models Through Subscription in machinery and Plant engineering

Establishing Sustainable Business Models Through Subscriptio...

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2024 Portland International Conference on Management of engineering and Technology, PICMET 2024

作者： Riesener, Michael Keuper, Alexander Bobmann, Carsten Smerz, Jonathan Schulz-Isenbeck, Timm Schuh, Gunther RWTH Aachen University Laboratory for Machine Tools and Production Engineering WZL Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (纸本)9781890843458

Companies in machinery and plant engineering make a significant contribution to global greenhouse gas emissions and the use of raw materials. Therefore, they have decisive poten-tial to make better use of resources, increase efficiency and avoid overproduction with regard to a more sustainable economy. How-ever, sustainability is not necessarily an end in itself for companies and must therefore be motivated by incentives. In addition to po-litical legislation and its mandatory implementation of sustainabil-ity initiatives, there must also be financial incentives for compa-nies. In this way, sustainable companies can be successful in a competitive environment in the long term. By using subscription mod-els, companies can establish a long-term and stronger connection to the products and customers. The resulting longer and more in-tensive use of the utilized resources or the extension of the life cycle through upgrades make a significant contribution to sustainabil-ity. This paper therefore examines the effect of subscription mod-els on the establishment of sustainable business models. On the one hand, interdependencies between subscription models and sus-tainable business models are determined. On the other hand, these interdependencies are analyzed concerning influencing factors for sustainability. © 2024 PICMET.

关键词： Kyoto Protocol

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Derivation of Targets for the Portfolio Planning of a Solution Provider in machinery engineering

Derivation of Targets for the Portfolio Planning of a Soluti...

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2024 Portland International Conference on Management of engineering and Technology, PICMET 2024

作者： Riesener, Michael Keuper, Alexander Bobmann, Carsten Schuh, Gunther RWTH Aachen University Laboratory for Machine Tools and Production Engineering WZL Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

ISBN: (纸本)9781890843458

Companies in the machinery engineering sector are increasingly forced to make a strategic decision to transform from product to solution providers. Increasing competitive pressure from international competitors, fewer technological differentiation options for mechatronic products, increased establishment of software applications and increasingly individualized customer requirements are posing challenges for companies. The transformation into a solution provider is one way to address these challenges. In addition, the transformation promises stable sales in the long term and the opportunity to use the resources utilized longer and more intensively in terms of the circular economy. Accordingly, solution providers are no longer selling products, but rather individualized bundles of products, services and software applications in result-oriented business models. However, companies lack a suitable target system for the planning of the portfolio for this transformation. The target system provides a framework to make decisions about the necessary products, services and software applications in the portfolio as well as the most reasonable composition of portfolio elements for individualized solutions. To this end, this paper derives and describes the corresponding targets and associated target dimensions for planning the portfolio of solution providers. © 2024 PICMET.

关键词： Sales

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