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Silver-integrated EDM processing of TiAl6V4 implant material has antibacterial capacity while optimizing osseointegration

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Bioactive Materials 2024年第1期31卷 497-508页

作者： Hilmar Büssemaker Ann-Kathrin Meinshausen Viet Duc Bui Joachim Döring Vadym Voropai Adrian Buchholz Andreas J.Mueller Karsten Harnisch André Martin Thomas Berger Andreas Schubert Jessica Bertrand Department of Orthopaedic Surgery Otto-von-Guericke University MagdeburgGermany Professorship Micromanufacturing Technology Chemnitz University of TechnologyChemnitzGermany Institute of Molecular and Clinical Immunology Otto-von-Guericke University MagdeburgGermany Health Campus Immunology Infectiology and InflammationOtto-von-Guericke University MagdeburgMagdeburgGermany Institute of Materials and Joining Technology Otto-von-Guericke UniversityMagdeburgGermany Fraunhofer Institute for Machine Tools and Forming Technology ChemnitzGermany

Periprosthetic joint infections(PJI)are a common reason for orthopedic revision *** has been shown that the silver surface modification of a titanium alloy(Ti-6Al-4V)by PMEDM(powder mixed electrical discharge machining)exhibits an antibacterial effect on Staphylococcus *** the thickness of the silver-modified surface influences the adhesion and proliferation of bacteria as well as the ossification processes and in-vivo antibacterial capacity has not been investigated ***,the aim of this work is to investigate the antibacterial effect as well as the in vitro ossification process depending on the thickness of PMEDM silver modified *** attachment of *** on the PMEDM modified surfaces was significantly lower than on comparative control samples,independently of the tested surface *** proliferation,however,was not affected by the silver content in the surface *** observed a long-term effect of antibacterial capacity in vitro,as well as in *** induction of ROS,as indicator for oxidative stress,was observed in the bacteria,but not in osteoblast-like *** influence on the in vitro osteoblast function was observed,whereas osteoclast formation was drastically reduced on the silver *** changes in cell death,the metabolic activity and oxidative stress was measured in *** show that already small amounts of silver exhibit a significant antibacterial capacity while not influencing the osteoblast ***,PMEDM using silver nano-powder admixed to the dielectric represents a promising technology to shape and concurrently modify implant surfaces to reduce infections while at the same time optimizing bone ingrowth of endoprosthesis.

关键词： alloy silver powder

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A survey on smart product-service systems in manufacturing

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Procedia CIRP 2023年 120卷 1504-1509页

作者： Anton Mauersberger Mohaned Alaluss Antonia Beyer Kilian Armin Nölscher Alexander Rauscher Heiner Reinhardt Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

The advancing digitization affects product design and manufacturing. Companies focus on product-service systems (PSS) to improve customer satisfaction and loyalty. However, these PSS become increasingly complex as digital technologies are incorporated and cross-company collaboration and manufacturing is facilitated. In essence, we can observe a transition from conventional PSS to smart PSS, where the opportunities of digitization are effectively utilized and synergies between multiple stakeholders are fostered. Here, we present an analysis and classification of smart PSS considering aspects of business modeling, composition, design, quality and sustainability.

关键词： Smart PSS Smart service Smart technologies Product-service system Remote service Development Innovation management Production Modular design Decision making

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Dismantling and remanufacturing strategies in the automotive sector

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Procedia CIRP 2024年 122卷 695-700页

作者： Rico Haase Daniele Farioli Rene Selbmann Markus Werner Verena Kräusel Fraunhofer Institute for Machine Tools and Forming Technology 09126 Chemnitz Germany Politecnico di Milano Department of Mechanical Engineering 20156 Milan Italy

The contemporary recycling of automobiles takes place on a very baseline material level. In order to fundamentally improve the ecologic footprint of the vehicle, a wider application of remanufacturing strategies is intended. Following different recycling approaches ranging from direct reuse or refurbishment through remanufacturing until repurpose, a well-aimed dismantling followed by manufacturing processes adapted to the post-consumer components is mandatorily required. For use on an industrial scale, environmental efficiency and economic viability must be balanced well. Within the paper, possible remanufacturing technologies and necessary prerequisites such as input data are discussed. For the design of remanufacturing operations, material properties and geometric information are a crucial starting point. Seamless integration of the specific properties is intended to encourage wider utilization of pre-used components and materials. With reference to the well-established process design for metal forming operations, adapted material cards and curvature equivalence values are proposed. The approach is illustrated by a reforming operation, where a brake disc cover is remanufactured from a used car body roof.

关键词： circular economy automotive recycling dismantling remanufacturing secondary raw material pre-used components

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A survey on sustainability approaches in manufacturing 30

A survey on sustainability approaches in manufacturing

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30th CIRP Life Cycle Engineering Conference, LCE 2023

作者： Prell, Bastian Reinhardt, Heiner Mauersberger, Anton Rauscher, Alexander Reiff-Stephan, Jörg Ihlenfeldt, Steffen Technical University of Applied Sciences Wildau Hochschulring 1 Wildau15745 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

Awareness about climate change has led to policies and regulations but also customer preferences favoring sustainable production. Thus, producing businesses are confronted by this, as they consume a large share of resources. Therefore, when producing, additional dimensions beyond commercial feasibility ought to be considered. Here, literature on sustainability from the field of engineering science is systematically searched and analyzed for approaches leading to actual recommendations for action. Hence, this bottom-up approach, incorporating the production engineers' point of view, represents an inside view of how the topic of sustainability has arrived at production companies. The focus on commercial feasibility ensures high relevance to practice, as production needs to become both sustainable and competitive. Even though exemplary collections of different approaches addressing the topic of sustainability in production can be found in literature, novelty is provided by the structured manner literature was collected and the special focus on approaches leading to practice-relevant recommendations for action. Thus, a comprehensive overview of approaches applicable to the manufacturing domain is presented. © 2023 The Authors. Published by Elsevier B.V.

关键词： Sustainable development

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Combining material flow simulation and optimization for sustainable manufacturing – application in automotive paint shops

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Procedia CIRP 2024年 122卷 659-664页

作者： Marian Süße Xinyi Xie Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Institute of Mechatronic Engineering Technische Universität Dresden Dresden Germany

The necessity for sophisticated decision support in industrial manufacturing has been described manifoldly and simulation approaches as well as optimization methods are continuously developed. This can be especially promising when it comes to decision-making with multidimensional requirements of economic and ecological efficiency. However, due to the required expert knowledge, there is still a gap between theoretically applicable and industrially applied methods. The paper therefore presents results of two use cases as part of the European project ECOFACT where different approaches for the combination of simulation and (heuristic) optimization were applied with industry partners. An overview of recent works and systematic literature reviews of sustainable manufacturing and the approaches for combining simulation and optimization is given. Correspondingly, the investigated use cases of automobile paint shops refer to the reduction of environmental impacts by optimized heating processes and an improved batching process to minimize paint waste. In the first case, setup times for heating color pools and ovens were shifted to avoid load peaks in a calculation time of less than one minute. In the second use case batch size was increased by around 25%.

关键词： Sustainable manufacturing Energy Simulation Optimization

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Micro structure rolling process with laser structured roller tools 21

Micro structure rolling process with laser structured roller...

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21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021

作者： Schmidt, Torsten Gärtner, Eric Schneider, Jörg Edelmann, Jan Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)9780995775190

In recent years, there has been an enormous increase in the need to specifically functionalize surfaces through microstructures and coatings. This is an attempt to meet increased performance requirements and the use of new materials in mechanical and automotive engineering. In most scientific publications on this subject, microstructures are created by laser ablation. However, this process is often not economical in the context of large-scale production. The structure rolling process for microstructuring of rotationally symmetric workpieces can close this gap. Short process times, comparatively simple handling and resource-efficient structuring characterize the structure rolling process. In the publication the workflow for structuring typical components is described. In addition, different processing strategies for the production of structured rolls using laser material processing are presented and compared. Based on the optimal manufacturing strategy derived from this, several structured rollers with different microstructure variants were manufactured. The successful application of the workflow and the tooling concept used for the structure rolling process is validated by experimental replication tests with different microstructures. The main focus is on the evaluation of the methodology for predicting and setting the necessary embossing force on the structure rolling tool to achieve the required structure depth. © 2021 Proceedings of the 21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021. All rights reserved.

关键词： Tribology

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Intelligent dressing for continuous generating grinding with convolutional neural networks and knowledge distillation

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Procedia CIRP 2024年 126卷 513-518页

作者： Martin Boesler Marco Schumann Philipp Klimant Martin Dix Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz 09126 Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany

Continuous generating grinding is a highly productive and precise way to finish hardened gears. However, the dressing of the tool has a huge potential for optimization. Detecting the optimal point to stop the dressing process would save cost and reduce machine downtime. This paper provides a proof of concept of how machine learning models can achieve these goals based on acoustic emission data. Therefore, different ML-Classifiers were trained and compared. Particular emphasis was placed on the robustness of the models. In addition, the trade-off between fast and robust models was examined.

关键词： Continuous generating grinding Dressing machine learning Convolutional neural network Distillation

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Effects of abrasive waterjet cutting on surface properties of hardened steel 16

Effects of abrasive waterjet cutting on surface properties o...

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16th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2022

作者： Redžic, Nermin Kieweg, Philipp Regel, Joachim Dix, Martin Chemnitz University of Technology Institute for Machine Tools and Production Processes Reichenhainer Str. 70 Chemnitz09126 Germany Franke GmbH Obere Bahnstraße 64 Aalen73431 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The importance of cutting hardened materials without influencing their structural properties makes abrasive waterjet machining a favorable choice in certain applications in comparison with other manufacturing technologies. Using this technology, faulty surface structures and errors caused by high thermal loads such as burrs, burns and cracks, can be avoided. In this paper, the results of applying the abrasive waterjet technology for cutting of hardened steel and its advantageous properties in comparison with cut-off grinding will be presented. The influence of process parameters on surface properties and burr formation has been determined by experimental analysis. © 2023 Elsevier B.V.. All rights reserved.

关键词： Grinding (machining)

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Intelligent parameter determination and quality control of an injection molding process

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Procedia CIRP 2024年 126卷 721-726页

作者： Sina Nahvi Marco Schumann Martin Dix Philipp Klimant Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany

One of the most extensively utilized techniques for material processing is injection molding, which is used to manufacture highly accurate and complex plastic items. In order to produce qualified items and ensure quality of the products, process parameter determination is crucial. We propose and compare two approaches for intelligently determining the parameters and controlling the quality within the injection molding process while aiming towards zero defects. These approaches are combinations of the process model trained using Automated machine Learning (AutoML) with optimization techniques based on Bayesian and genetic algorithms.

关键词： Injection molding Process parameter determination Quality control Optimization machine Learning

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An assessment method of machine components for usage-based value creation in complex manufacturing systems 56

An assessment method of machine components for usage-based v...

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56th CIRP International Conference on Manufacturing Systems, CIRP CMS 2023

作者： Alaluss, Mohaned Kurth, Robin Mauersberger, Anton Drechsler, Chris Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Institute of Mechatronic Engineering Dresden University of Technology Helmholtzstr. 7a Dresden01069 Germany

Rising demands on manufacturing technologies lead to an increase in the complexity of corresponding machines and systems. This complexity acts as an obstacle to the development and realization of digital, usage-based business models for complex manufacturing systems. Particularly in the case of pay-per-use business models, it is necessary to monitor the actual machine load in operation to minimize the business risk on the operator and supplier side. This complicates the transition towards data-oriented value creation in manufacturing system environment. To overcome this challenge, a novel method to assess machine components regarding their potential to monitor the actual load and usage behavior of the whole manufacturing system is proposed. On this basis, the transparency and therefore confidence in digital, usage-based value creation like pay-per-use business models can be increased. The resulting approach is demonstrated by taking the example of a sheet metal forming press. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on Manufacturing Systems 2023.

关键词： Decision making Forning Manufacturing Methodology Service

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