InformaApp - Publikationen

Beitrag (Sammelband oder Tagungsband)

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

Elektronischer Tagungsband ANSYS Conference & 31st CADFEM Users' Meeting - ACUM (19.06.2013; Mannheim)

Beitrag (Sammelband oder Tagungsband)

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

Elektronischer Tagungsband ANSYS Conference & 32nd CADFEM Users' Meeting - ACUM (04.06.2014; Nürnberg)

Beitrag (Sammelband oder Tagungsband)

S. Talbot, S. Hierl, Anton Schmailzl

Thermische FEM-Simulation des Laser-Durchstrahlschweißens

Forschungsbericht 2013, Kiel

Zeitschriftenartikel

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

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.

DOI: 10.1002/latj.201500029

Zeitschriftenartikel

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

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.

Zeitschriftenartikel

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

Beitrag (Sammelband oder Tagungsband)

Rechenzeitoptimierte Temperaturfeldberechnung beim quasisimultanen Laser-Durchstrahlschweißen

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

Beitrag (Sammelband oder Tagungsband)

Rechenzeitoptimierte Temperaturfeldberechnung zur virtuellen Prozessauslegung des quasisimultanen Laser-Durchstrahlschweißens

Forschungsbericht 2014, Kiel

Beitrag (Sammelband oder Tagungsband)

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)

DOI: 10.1117/12.2211705

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.

Beitrag (Sammelband oder Tagungsband)

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

Beitrag (Sammelband oder Tagungsband)

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

Beitrag (Sammelband oder Tagungsband)

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

Digital Angewandte Wirtschaftswissenschaften TC Grafenau

Beitrag (Sammelband oder Tagungsband)

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)

Vortrag

Diane Ahrens

Räumliche Unabhängigkeit Dank Digitalisierung

Sommerkolloquium 2020 der Bayerischen Akademie Ländlicher Raum und Akademie für Politik und Zeitgeschehen der Hanns-Seidel-Stiftung „Corona und die große Transformation: Perspektiven für die ländlichen Räume?“, München

Digital Nachhaltig Fraunhofer AWZ CTMT Maschinenbau und Mechatronik

Zeitschriftenartikel

Gabriel Herl, Jochen Hiller, A. Maier

Scanning trajectory optimisation using a quantitative Tuybased local quality estimation for robot-based X-ray computed tomography

Nondestructive Testing and Evaluation, vol. (Published 21 June 2020), no. 6

DOI: 10.1080/10589759.2020.1774579

Digital Nachhaltig Fraunhofer AWZ CTMT Maschinenbau und Mechatronik

Robotic CT systems allow complex scanning trajectories. This work presents a workflow to automatically calculate optimised scanning trajectories for robotic CT systems. In particular, as a local quality estimation, this work introduces a quantitative measure to quantify local reconstruction quality based on the Tuy conditions. The proposed method is tested in two summation experiments using an STL model of a motorcycle. In both experiments, a trajectory is calculated using a quantitative Tuy-based local quality estimation and the reconstruction result is then compared to reconstructions using conventional scanning trajectories. The comparison results indicate that the proposed approach automatically finds trajectories that enable 3D reconstructions with high image quality using much less projection data, which allows a significant reduction of scanning time.

Zeitschriftenartikel

A. Stock, Gabriel Herl, T. Sauer, Jochen Hiller

Edge-preserving compression of CT scans using wavelets

Insight - Non-Destructive Testing and Condition Monitoring (The British Institute of Non-Destructive Testing), vol. 62, no. 6, pp. 345-351

DOI: 10.1784/insi.2020.62.6.345

This work addresses the subject of efficient storage of computed tomography (CT) data with an emphasis on the quality of surfaces. Industrial dimensional metrology often requires high measurement accuracy and it is shown that this is retained using wavelet-based compression methods. The applied techniques include a tensor product wavelet transform and soft wavelet shrinkage. In these tests, performed on real objects, dimensional CT measurements of compressed and uncompressed volumes were compared. The necessary storage space was reduced significantly with a negligible loss of accuracy. The storage space required for a multi-sphere phantom was decreased to 4.7% (from 638 MB to 30 MB), with an average deviation below 1 μm from the original volume.

Beitrag (Sammelband oder Tagungsband)

Scanner-integrierte Temperaturmesstechnik beim Laser-Durchstrahlschweißen

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

Beitrag (Sammelband oder Tagungsband)

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