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Prof. Dr.-Ing. Anton Schmailzl, MBA

Centre for Applied Research

TC Parsberg/Lupburg

Academic Director

1.18

09492/8384-101

publications

Sortierung:

Contribution

Anton Schmailzl
T. Amann
M. Glockner
M. Fadanelli
M. Wagner
S. Hierl

Finite element analysis of thermoplastic probes under tensile load using ls-dyna compared to ansys workbench 14 in correlation to experimental investigations.

In: Elektronischer Tagungsband ANSYS Conference & 30th CADFEM Users' Meeting - ACUM (24.-26.10.2012; Kassel) . pg. 1-10

Eds.:
CADFEM GmbH u. ANSYS Germany GmbH

(2012)

Contribution

Anton Schmailzl
S. Hierl

Hierl, S.: Online-Prozessüberwachung beim Quasi-Simultanen Laser-Durchstrahlschweißen von Kunststoffen.

In: Young Professionals - Jugend forscht und Schweisst. pg. 1-7

Eds.:
GSI Niederlassung SLV München

(2013)

Contribution

Anton Schmailzl
S. Hierl

Thermo-mechanische Struktursimulation mit ANSYS Workbench 14.0 am Beispiel des Laser-Durchstrahlschweißens.

In: Elektronischer Tagungsband ANSYS Conference & 31st CADFEM Users' Meeting - ACUM (19.06.2013; Mannheim) . pg. 1-16

Eds.:
CADFEM GmbH u. ANSYS Germany GmbH

(2013)

Contribution

S. Talbot
S. Hierl
Anton Schmailzl

Thermische FEM-Simulation des Laser-Durchstrahlschweißens.

In: Forschungsbericht 2013. pg. 45-46

Eds.:
Ostbayerische Technische Hochschule Regensburg

Inixmedia GmbH Kiel

(2013)

Journal article

Anton Schmailzl
S. Hierl
M. Sieben
F. Brunnecker

Optimierung der Spanndruckverteilung beim Laserdurchstrahlschweißen komplexer Bauteile mittels FE-Berechnung.

In: Joining Plastics - Fügen von Kunststoffen vol. 7 pg. 30-34

(2013)

Contribution

Anton Schmailzl

On-axis process monitoring of quasi-simultaneous laser transmission welding of polymers.

In: Applied Research Conference 2013, ARC 2013. 17th and 18th October 2013, Deggendorf (Konferenz im Forschungsmaster - Master of Applied Research, MAPRby) pg. 374-378

Eds.:
Werner Bogner
J. Mottok
O. Ziemann

Shaker Aachen

(2013)

Contribution

Anton Schmailzl
S. Hierl

Rechenzeitoptimierte Temperaturfeldberechnung zur virtuellen Prozessauslegung des quasisimultanen Laser-Durchstrahlschweißens.

In: Forschungsbericht 2014. pg. 75-77

Eds.:
Ostbayerische Technische Hochschule Regensburg

Inixmedia GmbH Kiel

(2014)

Contribution

Anton Schmailzl
S. Hierl

FE-Modellbildung der Strahl-Stoff-Wechselwirkung beim Laser-Durchstrahlschweißen in ANSYS 14.0.

In: Elektronischer Tagungsband ANSYS Conference & 32nd CADFEM Users' Meeting - ACUM (04.06.2014; Nürnberg) . pg. 1-15

Eds.:
CADFEM GmbH u. ANSYS Germany GmbH

(2014)

Journal article

S. Steger
M. Dostalek
Anton Schmailzl
S. Hierl

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

In: Kunststoffe vol. 105 pg. 55-58

(2015)

Journal article

M. Dostalek
S. Steger
Anton Schmailzl
S. Hierl

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

In: Kunststoffe International vol. 105 pg. 37-40

(2015)

show abstract

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.

Journal article

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.

In: Laser Technik Journal vol. 12 pg. 34-37

(2015)

DOI: 10.1002/latj.201500029

show abstract

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.

Contribution

Anton Schmailzl
S. Hierl

Rechenzeitoptimierte Temperaturfeldberechnung beim quasisimultanen Laser-Durchstrahlschweißen.

In: Elektronischer Tagungsband zur ANSYS Conference & zum 33. CADFEM Users' Meeting - ACUM (24.06.2015; Bremen) . pg. 1-15

Eds.:
CADFEM GmbH u. ANSYS Germany GmbH

(2015)

Contribution

Anton Schmailzl
S. Steger
M. Dostalek
S. Hierl

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

In: Proceedings of SPIE 9736: SPIE LASE (13-18 February 2016; San Francisco, CA, USA). pg. 9736J1-7

Eds.:
C. Arnold
K. Washio
U. Klotzbach

(2016)

DOI: 10.1117/12.2211705

show abstract

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.

Contribution

Anton Schmailzl
S. Hierl
M. Schmidt

Gap-Bridging during Quasi-Simultaneous Laser Transmission Welding.

In: Proceedings of the 9th Conference on Photonic Technologies - LANE 2016 (19-22 September 2016; Fürth). pg. 1073-1082

Eds.:
M. Schmidt

Meisenbach Bamberg

(2016)

Contribution

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.

In: Forschungsbericht 2016. pg. 37-38

Eds.:
Ostbayerische Technische Hochschule Regensburg

Inixmedia GmbH Kiel

(2016)

Contribution

Johannes Käsbauer
Anton Schmailzl
S. Hierl

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

In: Applied Research Conference 2017. ARC 2017: 7 July 2017, München (Konferenz im Forschungsmaster - Master of Applied Research, MAPRby)

Eds.:
M. Reichenberger
J. Mottok
C. Klippel

pro Business GmbH Berlin

(2017)

Contribution

Anton Schmailzl
S. Hierl

Scanner-integrierte Temperaturmesstechnik beim Laser-Durchstrahlschweißen.

In: Elektronisches Handout zum 20. Seminar „Laser in der Elektronikproduktion & Feinwerktechnik“ (7.+8. März 2017; Fürth) . pg. 181-192

Eds.:
Bayerisches Laserzentrum (blz) GmbH

(2017)

Contribution

F. Maiwald
Anton Schmailzl
S. Hierl

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

In: Applied Research Conference 2017. ARC 2017: 7 July 2017, München (Konferenz im Forschungsmaster - Master of Applied Research, MAPRby)

Eds.:
M. Reichenberger
J. Mottok
C. Klippel

pro Business GmbH Berlin

(2017)

Contribution

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.

In: Proceedings of LiM2017 - Lasers in Manufacturing (26-29 June 2017; Munich). pg. 1-10

Eds.:
C. Esen

(2017)

Contribution

Anton Schmailzl
S. Steger
S. Hierl

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

In: Kalibrierung des 2D- und 3D- Arbeitsfeldes von Laser-Scan-Systemen. Digitaler Tagungsband zum Photonikseminar pg. 48-56

Eds.:
bayern photonics e.V.
Bayerisches Laserzentrum (blz) GmbH

(2017)

Contribution

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

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

In: Tagungsband zur 2. OTH-Clusterkonferenz 2017. pg. 201-204

Eds.:
Ostbayerische Technische Hochschule Regensburg
Ostbayerische Technische Hochschule Amberg-Weiden

Weber Druck Regensburg

(2017)

Contribution

Johannes Käsbauer
Anton Schmailzl
S. Hierl

Simulationsgestützte Prozessentwicklung beim Laser Durchstrahlschweißen von Thermoplasten ohne absorbierende Füllstoffe.

In: Tagungsband zur 36. CADFEM ANSYS Simulation Conference (10.-12.10.2018; Leipzig). pg. 1-9

Eds.:
CADFEM GmbH u. ANSYS Germany GmbH

(2018)

Journal article

Anton Schmailzl
B. Quandt
M. Schmidt
S. Hierl

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

In: Procedia CIRP vol. 74 pg. 524-527

(2018)

DOI: 10.1016/j.procir.2018.08.131

show abstract

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.

Journal article

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

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

In: Joining Plastics - Fügen von Kunststoffen pg. 102-109

(2019)

Contribution

Anton Schmailzl
B. Quandt
S. Hierl
M. Schmidt

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

In: Proceedings of LiM2019 - Lasers in Manufacturing (23 June 2019, Munich). pg. 1-10

(2019)

Contribution

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.

In: Mathematical Modelling of Weld Phenomena 12. Selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability, September 23 – 26, 2018 Graz - Schloss Seggau - Austria (Mathematical Modelling of Weld Phenomena) pg. 965-978

Eds.:
C. Sommitsch
P. Mayr
N. Enzinger

Verlag der Technischen Universität Graz Graz, Österreich

(2019)

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

show abstract

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.

Lecture

Anton Schmailzl
Korbinian Schröcker
Ludwig Gansauge
Andrey Prihodovsky

Potenziale von hybriden Fertigungsprozessketten.

In: 1. TRIOKON 2019 – Die ostbayerische Transferkonferenz für Wirtschaft, Wissenschaft und Gesellschaft

Regensburg

27.09.2019 (2019)

Journal article

Anton Schmailzl
Johannes Käsbauer
J. Martan
P. Honnerová
F. Schäfer
Maximilian 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.

In: International Journal of Heat and Mass Transfer vol. 146 pg. 118814

(2020)

DOI: 10.1016/j.ijheatmasstransfer.2019.118814

show abstract

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.

Journal article

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.

In: Procedia CIRP vol. 94 pg. 737-741

(2020)

DOI: 10.1016/j.procir.2020.09.136

show abstract

Thermo-mechanical simulation offers great opportunities to optimize welding processes of plastics. For realistic simulation, the temperature dependent mechanical properties need to be implemented from ambient temperature to temperatures above the flow temperature. Standard test methods are insufficient for characterization in the entire temperature range because close to the flow temperature the material is too soft for tensile tests and too stiff for rheometry. Therefore, an optimization strategy is developed, that determines unknown material parameters by testing in welding simulations. The unknown parameters are iteratively adjusted to minimize the mismatch between computed and measured set-paths. Thus, important process characteristics are calculated realistically, enabling the computer aided assessment of the weld quality.

Lecture

Johannes Käsbauer
Anton Schmailzl
T. Loose
S. Hierl

Thermo-Mechanical Modeling of Quasi-Simultaneous Laser Transmission Welding using LS-DYNA with Focus on Accuracy of Heat Input Calculation.

In: Technology Day 2020 - Plastics on the test rig

Traboch, Österreich

04.03.2020 (2020)

Lecture

Johannes Käsbauer
Anton Schmailzl
T. Loose
S. Hierl

Potentials of the EFG-Method for Modeling Quasi-Simultaneous Laser Transmission Welding Considering the Melt Flow.

In: Simulationsforum 2019 Schweißen und Wärmebehandlung

Weimar

05.-07.11.2020 (2020)

Contribution

Philipp Flierl
A. Zimmermann
M. Niedermeier
F. Noori
E. Fuchs
Anton Schmailzl

Vertical-Farming-System für die Bilddatengenerierung zur KI-gestützten Identifikation des Wachstumszentrums von Beikräutern. Erkenntnisse aus dem Projekt KIdetect gefördert durch das BMEL.

In: Kolloquium Landwirtschaft der Zukunft: Ist KI ein wesentlicher Schlüssel zur nachhaltigeren Landwirtschaft?. pg. 1-6

(2023)

Contribution

F. Noori
L. Hopf
Philipp Flierl
A. Zimmermann
M. Niedermeier
G. Holst
Anton Schmailzl

Methods and techniques for plant and weed detection creating a database for future computer vision systems in weed control and practical implementations. Insights from the KIdetect project, funded by the BMEL.

In: INFORMATIK 2024. Lock-in or log out? Wie digitale Souveränität gelingt. Kolloquium Landwirtschaft der Zukunft 2024 (KoLaZ-24) - Digitale Souveränität in der Landwirtschaft, der Lebensmittelkette und dem ländlichen Raum: Trotz, mit, oder durch KI? (26.09.2024) (Lecture Notes in Informatics (LNI)) pg. 1287-1293

Eds.:
D. Krupka
M. Gergeleit
M. Klein
L. Martin
C. Winter

Gesellschaft für Informatik e.V. (GI), Köllen Druck+Verlag GmbH Bonn

(2024)

show abstract

This paper explores weed detection methodologies in vertical farming systems using Short Wave Infrared (SWIR) and Visual (VIS) camera technology, alongside computer vision techniques and Artificial Intelligence (AI). It investigates pixel-matching techniques for stereo-image processing to enhance imaging accuracy and reliability in agriculture. Classical methods like SIFT FLANN Matcher, Epiline Matcher, and Partial Epiline Matcher are evaluated. The paper also examines the integration of AI with classical pixel-matching methods to streamline pixel pair identification. Real-world accuracy assessments demonstrate promising results, facilitating practical applications. Additionally, it covers camera calibration and image rectification tasks on VIS cameras to support 3D reconstruction for plant structure analysis, alongside Stereo pixel matching. Overall, it provides valuable insights into stereo image analysis in agriculture, fostering future research and practical implementations in precision agriculture and computer vision systems.