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Eisele M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Weskamp M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Kraus M.,SiProM Services fur innovatives Projektmanagement GmbH
Productivity Management | Year: 2012

Manufacturing companies with a high share of value added in assembly have realized that productivity in series production can be considerably increased by a number of optimization approaches, such as value stream design or simulation techniques. Therefore, the question arises why this huge potential is only tapped into after the start of series production. As part of the research project NäGeMo, a new IT-based pre-series planning approach has been developed which unlocks the value-added potential for optimization even before series production is started. © GITO Verlag.

Pavuluri S.K.,Heriot - Watt University | Ferenets M.,Estonian Innovation Institute | Goussetis G.,Queen's University of Belfast | Desmulliez M.P.Y.,Heriot - Watt University | And 5 more authors.
IEEE Transactions on Components, Packaging and Manufacturing Technology | Year: 2012

An open-ended microwave oven system is presented and characterized for the rapid encapsulation of microelectronic components. In situ real-time measurement of the temperature of the curing materials is carried out by an infrared pyrometer integrated in the microwave head of the oven. An automatic computer-controlled closed feedback loop has been used to measure the temperature in the curing material and modulate the system operating power to obtain predefined curing temperature cycles for efficient curing. Uniform curing of the encapsulant material is achieved with typical cure time of ∼300 s with a ramp rate of 1.66 °C/s and a hold period of ∼100 s. Differential scanning calorimeter based measurement for the curing of the polymer dielectric indicates a near 100% degree of cure. © 2011-2012 IEEE.

Wanner M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Krawczyk K.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Schafer D.,Flint Group Germany GmbH | Schauer T.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Progress in Organic Coatings | Year: 2010

Multi-layer coating systems are the state of the art for painting of metal and plastic surfaces e.g. in the automotive industry. Utilizing such systems consisting of several specialized coating materials, a high adhesion and a good corrosion protection can be reached, along with good barrier properties, chemical and scratch resistance as well as appealing surface appearance. The interphase regions between single layers of such systems represent areas of a potential weakness, where a delamination and a premature coating degradation can start. To test in a short time the protective properties of the coating, a special hydrothermal cyclic loading test procedure was developed, which causes accelerated build-up of internal stress within the coating system. Using an electrochemical impedance spectroscopy with various optimized electrode geometries, it was possible to detect the early stages of coating degradation and to compare different coating systems. Internal stress measurements contributed additionally to a better understanding of the coating degradation. © 2010 Elsevier B.V.

Bohem M.E.,University of Stuttgart | Bohem M.E.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Pook N.-P.,Clausthal University of Technology | Adam A.,Clausthal University of Technology | And 4 more authors.
Dyes and Pigments | Year: 2015

Longterm durability is a ubiquitous aim in coatings technology. Inorganic pigments are of great interest in this field because of their high photostability and their capability of preventing photodegradation. In this work, tetragonal (space group: P41) cerium(III)-doped La2[Si2O7] has been synthesized and applied as a novel protective pigment, with regards to stability and environmental friendliness. The characterization of the La2-xCex[Si2O7] system revealed relevant photoluminescence and scintillation properties. The non-centrosymmetric host lattice shows second-harmonic generation activity. The decay time of crystalline, non-hygroscopic powders of the compound was shown to be in a competitive range (<30 ns). Furthermore, the spectral patterns of the initial synthesis product could be maintained after particle size reduction and were also detectable after incorporation into a coating formulation, while avoiding a significant colour shift in the coated films. The potential of an innovative UV-protection concept for coatings, based on La2[Si2O7]:Ce3+ could be successfully pointed out. © 2015 Elsevier Ltd. All rights reserved.

Alig I.,Deutsches Kunststoff - Institute | Bargmann M.,Deutsches Kunststoff - Institute | Oehler H.,Deutsches Kunststoff - Institute | Lellinger D.,Deutsches Kunststoff - Institute | And 2 more authors.
Journal of Physics D: Applied Physics | Year: 2011

Scanning acoustic microscopy (SAM) was used to investigate disbonding, delamination and blister formation in polymer coatings for different layer structures and initial defect depths during exposure to a corrosive environment. The time evolution of disbonding and blister initiation and their growth was investigated by analysing the SAM images, taken after defined times of exposure to an electrolyte solution (Harrison solution). From investigations of a model system of coatings on steel substrates, it was possible to differentiate between water and/or ion transport (i) through the coating and (ii) along the coating-steel interface. For samples without clear coat randomly distributed blisters appeared at the coating-steel interface after exposure to the electrolyte solution, irrespective of the location of initial defects. The random distribution of growing blisters is related to diffusion of water and/or ions through the coating and 'nucleation' at weak points of the substrate or within the polymer. For samples with clear coat a propagating migration front along the coating-steel interface of 3-4μm height-starting from initial defects-was detected. The linear propagation of this front cannot be explained by Fickian diffusion. Therefore, it is discussed in terms of an accelerated diffusion or crack growth kinetics. Since blistering starts only at sites, where the migration front has passed, the presence of a thin water layer at the coating-steel interface, the loss of adhesion and the following corrosive processes are prerequisites for the nucleation of blisters. The blister growth shows a square-root time dependence. © 2011 IOP Publishing Ltd.

Mussbach-Winter U.,Fraunhofer Institute for Manufacturing Engineering and Automation | Schatz A.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Productivity Management | Year: 2010

ERP and MES, two IT solutions for production planning and control, generate the expected effort only under the condition of an optimized interface between both applications related to the allocation of functions and the data management. This contribution presents hints to design an efficient interface. © GITO-Verlag.

Kroll J.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Botta S.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Verl J.B.A.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

In this paper, the possibilities of modern 3D data evaluation for metrology and quality assurance are presented for the special application of the plastic laser sinter process, especially the Additive Manufacturing process. We use the advantages of computer tomography and of the 3D focus variation at all stages of a production process for an increased quality of the resulting products. With the CT and the 3D focus variation the modern quality assurance and metrology have state of the art instruments that allow non-destructive, complete and accurate measuring of parts. Therefore, these metrological methods can be used in many stages of the product development process for non-destructive quality control. In this work, studies and evaluation of 3D data and the conclusions for relevant quality criteria are presented. Additionally, new developments and implementations for adapting the evaluation results for quality prediction, comparison and for correction are described to show how an adequate process control can be achieved with the help of modern 3D metrology techniques. The focus is on the optimization of laser sintering components with regard to their quality requirements so that the functionality during production can be guaranteed and quantified. © 2013 SPIE-IS&T.

Effenberger I.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Kuhnle J.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Verl A.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

In automation and handling engineering, supplying work pieces between different stages along the production process chain is of special interest. Often the parts are stored unordered in bins or lattice boxes and hence have to be separated and ordered for feeding purposes. An alternative to complex and spacious mechanical systems such as bowl feeders or conveyor belts, which are typically adapted to the parts' geometry, is using a robot to grip the work pieces out of a bin or from a belt. Such applications are in need of reliable and precise computer-aided object detection and localization systems. For a restricted range of parts, there exists a variety of 2D image processing algorithms that solve the recognition problem. However, these methods are often not well suited for the localization of randomly stored parts. In this paper we present a fast and flexible 3D object recognizer that localizes objects by identifying primitive features within the objects. Since technical work pieces typically consist to a substantial degree of geometric primitives such as planes, cylinders and cones, such features usually carry enough information in order to determine the position of the entire object. Our algorithms use 3D best-fitting combined with an intelligent data pre-processing step. The capability and performance of this approach is shown by applying the algorithms to real data sets of different industrial test parts in a prototypical bin picking demonstration system. © 2013 SPIE-IS&T.

Holtewert P.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Wutzke R.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Seidelmann J.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Bauernhansl T.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Procedia CIRP | Year: 2013

In future the engineer and IT world will grow together. Networking and linking of information from the physical production and the digital world enable an optimization in manufacturing. Within the research project Virtual Fort Knox at the Fraunhofer IPA in Germany, a federative, secure and cloud-based platform for distributed service-oriented applications in plant operation is developed. The challenge is to establish a platform for the manufacturing to improve data processing and intelligent, cooperative networking. Data and information have to be saved, read and used on a flexible, simple and scalable way. This paper presents our research work in developing the platform by the description of the transformation process to the networked factory. The main aspects are consistent, integrated security across all components, community cloud for IT-decentralization respectively data, cooperation and competence distribution. © 2013 The Authors.

Weskamp M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Sauer M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Zwissler F.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Productivity Management | Year: 2013

Sustainable use of resources will be a strategic competitive factor for manufacturing enterprises. To overcome the complex correlations of this topic the use of complexity management as an instrument is recommended. IT-systems like a MES provide the necessary transparency for this task. © GITO Verlag.

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