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Suche nach „[Schmailzl] [Anton]“ hat 31 Publikationen gefunden
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    Anton Schmailzl, Johannes Käsbauer, J. Martan, P. Honnerová, F. Schäfer, M. Fichtl, T. Lehrer, L. Prušáková, J. Tesař, J. Skála, M. Honner

    Measurement of core temperature through semi-transparent polyamide 6 using scanner-integrated pyrometer in laser welding

    International Journal of Heat and Mass Transfer, vol. 146, no. January

    2020

    DOI: 10.1016/j.ijheatmasstransfer.2019.118814

    Abstract anzeigen

    Predicting the core temperature during welding is an ambitious aim in many research works. In this work, a 3D-scanner with integrated pyrometer is characterized and used to measure the temperature during quasi-simultaneous laser transmission welding of polyamide 6. However, due to welding in an overlap configuration, the heat radiation emitted from the joining zone of a laser transmission weld has to pass through the upper polymer, which is itself a semi-transparent emitter. Therefore, the spectral filtering of the heat radiation in the upper polymer is taken into account by calibrating the pyrometer for the measurement task. Thermal process simulations are performed to compare the temperature field with the measured temperature signal. The absorption coefficients of the polymers are measured, in order to get precise results from the computation. The temperature signals during welding are in good agreement with the computed mean temperature inside the detection spot, located in the joining area. This is also true for varying laser power, laser beam diameter and the carbon black content in the lower polymer. Both, the computed mean temperature and the temperature signal are representing the core temperature. In order to evaluate the spatial sensitivity of the measurement system, the emitted heat radiation from both polymers is calculated on basis of the computed temperature field. Hereby it is found, that more than 90 percent of the detected heat radiation comes from the joining area, which is a crucial information for contact-free temperature measurement tasks on semi-transparent polymers.

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    Johannes Käsbauer, Anton Schmailzl, J. Prehm, T. Loose, S. Hierl

    Simulation of Quasi-Simultaneous Laser Transmission Welding of Plastics: Optimization of Material Parameters in Broad Temperature Range

    [Accepted for publication]

    Procedia CIRP

    2020

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    Anton Schmailzl, S. Hüntelmann, T. Loose, Johannes Käsbauer, F. Maiwald, S. Hierl

    Potentials of the ALE-Method for Modeling Plastics Welding Processes, in Particular for the Quasi-Simultaneous Laser Transmission Welding

    Mathematical Modelling of Weld Phenomena 12, Graz, Österreich, vol. 12

    2019

    ISBN: 978-3-85125-615-4

    DOI: 10.3217/978-3-85125-615-4-51

    Abstract anzeigen

    The Arbitrary-Lagrangian-Eulerian-Method (ALE-Method) offers the possibility to model the quasi-simultaneous laser transmission welding of plastics, in which a squeeze-flow of molten plastic occurs. It is of great interest to get a deeper understanding of the fluid-structure-interactions in the welding zone, since the occurring squeeze-flow transports heated material out of the joining zone, causing a temperature decrease inside. In addition, the numerical modelling offers the possibility to investigate the flow conditions in the joining zone. The aim of this article is to show the potentials of the ALE-Method to simulate the quasi-simultaneous laser transmission welding with the commercially available software LS-DYNA. The central challenge is to realize a bi-directional thermo-mechanically coupled simulation, which considers the comparatively high thermal expansion and calculates the interactions of solid and melted plastic correctly. Finally, the potentials of the ALE element formulations for the mathematical description of welding processes are shown, especially for those with a squeeze-flow.

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    Anton Schmailzl, B. Quandt, S. Hierl, M. Schmidt

    Correlation between Joint Strength and Process Temperature in Quasi-Simultaneous Laser Transmission Welding of Polyamide 6

    Proceedings of LiM2019 - Lasers in Manufacturing (23 June 2019, Munich)

    2019

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    Johannes Käsbauer, Anton Schmailzl, U. Weber, S. Hierl, T. Jaus, M. Schwalme

    Simulationsgestütze Evaluierung von Strahloszillationsmustern beim quasi-simultanen Laser-Durchstrahlschweißen.

    Joining Plastics - Fügen von Kunststoffen, no. 2, pp. 102-109

    2019

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    Anton Schmailzl, B. Quandt, M. Schmidt, S. Hierl

    In-Situ process monitoring during laser transmission welding of PA6-GF30

    Procedia CIRP, vol. 74, pp. 524-527

    2018

    DOI: 10.1016/j.procir.2018.08.131

    Abstract anzeigen

    Quasi-simultaneous laser transmission welding is preferably used for packaging sensors and electronics. In order to protect the components from moisture, a hermetic encapsulation is needed. However, local weld seam interruptions cannot be identified with the commonly used set-path monitoring. By using a pyrometer, coaxially integrated into a 3D-scanner, gaps between the joining partners can be allocated on basis of the measured temperature. However, the scattering of the heat radiation, especially caused by the fiber reinforcement of the plastics, leads to a reduction of the accessible heat radiation, which makes the identification of gaps considerably more difficult. The herein used experimental setup is characterized by a small detection spot and only by a slight weakening of the heat radiation inside the scanner. Hence, for welding PA6-GF30, the detection of small sized gaps is possible, even if a glass fiber content of 30 percent (wt.) and a weld seam width with approximately 1 mm are given.

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    Beitrag (Sammelband oder Tagungsband)

    Johannes Käsbauer, Anton Schmailzl, S. Hierl

    Simulationsgestützte Prozessentwicklung beim Laser Durchstrahlschweißen von Thermoplasten ohne absorbierende Füllstoffe

    Tagungsband zur 36. CADFEM ANSYS Simulation Conference (10.-12.10.2018; Leipzig)

    2018

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    Anton Schmailzl, D. Armbruster, M. Dostalek, S. Steger, S. Hierl

    Strahlführungs- und -formungskonzept zur koaxialen Temperaturmessung beim scanner-basierten Laser-Durchstrahlschweißen

    Tagungsband zur 2. OTH-Clusterkonferenz 2017, Regensburg

    2017

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    Anton Schmailzl, B. Geissler, F. Maiwald, T. Laumer, M. Schmidt, S. Hierl

    Transformation of Weld Seam Geometry in Laser Transmission Welding by Using an Additional Integrated Thulium Fiber Laser

    Proceedings of LiM2017 - Lasers in Manufacturing (26-29 June 2017; Munich)

    2017

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    Anton Schmailzl, S. Hierl

    Scanner-integrierte Temperaturmesstechnik beim Laser-Durchstrahlschweißen

    Elektronisches Handout zum 20. Seminar „Laser in der Elektronikproduktion & Feinwerktechnik“ (7.+8. März 2017; Fürth)

    2017

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    Anton Schmailzl, S. Steger, S. Hierl

    Herausforderungen bei der Integration einer pyrometrischen Temperaturmesstechnik in 3D-Laserscansysteme

    Kalibrierung des 2D- und 3D- Arbeitsfeldes von Laser-Scan-Systemen

    2017

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    F. Maiwald, Anton Schmailzl, S. Hierl

    Thermo-mechanical computation of weld seam geometry in laser transmission welding

    Applied Research Conference 2017, Berlin

    2017

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    Johannes Käsbauer, Anton Schmailzl, S. Hierl

    Simulative investigation on the influence of material- and process parameter on quasi-simultaneous laser transmission welding

    Poster Session

    Applied Research Conference 2017, Berlin

    2017

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    Anton Schmailzl, S. Steger, M. Dostalek, S. Hierl

    Online process monitoring at quasi-simultaneous laser transmission welding using a 3D-scanner with integrated pyrometer

    Proceedings of SPIE 9736: SPIE LASE (13-18 February 2016; San Francisco, CA, USA)

    2016

    DOI: 10.1117/12.2211705

    Abstract anzeigen

    Quasi-simultaneous laser transmission welding is a well-known joining technique for thermoplastics and mainly used in the automotive as well as in the medical industry. For process control usually the so called set-path monitoring is used, where the weld is specified as "good" if the irradiation time is inside a defined confidence interval. However, the detection of small-sized gaps or thermal damaged zones is not possible with this technique. The analyzation of the weld seam temperature during welding offers the possibility to overcome this problem. In this approach a 3D-scanner is used instead of a scanner with flat-field optic. By using a pyrometer in combination with a 3D-scanner no color-corrected optic is needed in order to provide that laser- and detection-spot are concentric. Experimental studies on polyethylene T-joints have shown that the quality of the signal is adequate, despite the use of an optical setup with a long working distance and a small optical aperture. The effects on temperature are studied for defects like a gap in the joining zone. Therefore a notch was milled into the absorbent polymer. In case of producing housings for electronic parts the effect of an electrical wire between the joining partners is also investigated. Both defects can be identified by a local temperature deviation even at a feed rate of four meters per second. Furthermore a strategy for signal-processing is demonstrated. By this, remaining defects can be identified. Consequently an online detection of local defects is possible, which makes a dynamic process control feasible.

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    S. Steger, Anton Schmailzl, M. Dostalek, D. Armbruster, S. Hierl

    Entwicklung einer Systemtechnik für das quasisimultane Laser-Durchstrahlschweißen von 3D-Kunststoffbauteilen mit Temperaturmessung und Spanndruckregelung

    Forschungsbericht 2016, Kiel

    2016

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    Anton Schmailzl, S. Hierl, M. Schmidt

    Gap-Bridging during Quasi-Simultaneous Laser Transmission Welding

    Proceedings of the 9th Conference on Photonic Technologies - LANE 2016 (19-22 September 2016; Fürth), Bamberg

    2016

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    M. Dostalek, S. Steger, Anton Schmailzl, S. Hierl

    Detecting Defects Reliably. Pyrometer-Based Temperature Measurement during Quasi-Simultaneous Laser Transmission Welding.

    Kunststoffe International, vol. 105, no. 12, pp. 37-40

    2015

    Abstract anzeigen

    The integration of a broadband pyrometer in a 3-D scanner enables a continuous and local temperature measurement during the quasi-simultaneous laser transmission welding process. Welding tests on polyethylene samples show that defects can be clearly identified based on the temperature signal, despite a high scanning velocity.

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    Anton Schmailzl, S. Steger, S. Hierl

    Process Monitoring at Laser Welding of Thermoplastics. 3D‐scanner with integrated pyrometer enables online temperature monitoring at quasi‐simultaneous laser transmission welding

    Laser Technik Journal, vol. 12, no. 4, pp. 34-37

    2015

    DOI: 10.1002/latj.201500029

    Abstract anzeigen

    A pyrometer, integrated into a 3D‐scanner, offers the possibility to measure the weld seam temperature at quasi‐simultaneous laser transmission welding. Experimental studies have shown that gaps located in the joining zone can be identified by a temperature rise even at a high scanning velocity. This enables the implementation of algorithms for observation and control strategies.

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    S. Steger, M. Dostalek, Anton Schmailzl, S. Hierl

    Fehlstellen sicher erkennen. Pyrometerbasierte Temperaturmessung beim quasi-simultanen Laser-Durchstrahlschweißen.

    Kunststoffe, vol. 105, no. 12, pp. 55-58

    2015

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    Beitrag (Sammelband oder Tagungsband)

    Anton Schmailzl, S. Hierl

    Rechenzeitoptimierte Temperaturfeldberechnung beim quasisimultanen Laser-Durchstrahlschweißen

    Elektronischer Tagungsband zur ANSYS Conference & zum 33. CADFEM Users' Meeting - ACUM (24.06.2015; Bremen)

    2015