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Author: Schläfer, T. ×

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Now showing 1 - 3 of 3
  • Publication
    Potenziale zur Produktivitätssteigerung mittels Kombianlagen zum Thermischen Spritzen und Laserauftragschweißen
    ( 2013)
    Wank, A.
    ;
    Beck, F.
    ;
    Schläfer, T.
    ;
    Nowotny, S.
    ;
    Brückner, F.
    ;
    Hillig, H.
    ;
    Pfennig, M.
    ;
    Thieme, S.
    Neuartige Beschichtungsanlagen lassen die Steuerung von sowohl thermischen Spritzprozessen als auch von laserbasierten Prozessen zur Oberflächenbehandlung zu. Produktionsrate und -effizienz beim Laserauftragschweißen lassen sich durch Techniken zur Vorwärmung von Substrat- oder Zusatzwerkstoff steigern. Im Vergleich zum klassischen Prozess des Laserauftragschweißens liegt der Nutzen dieser Technologien in ihrem Einfluss auf die industriellen Produktionsprozesse. Der aus diesen Technologien resultierende Nutzen (im Vergleich zum konventionellen Laserauftragschweißen) wird im Folgenden in Bezug auf die Bedeutung für industrielle Produktionsprozesse bewertet. Besondere Vorteile werden anhand von industriellen Anwendungen wie Hydraulikkolben, Kupferkokillenplatten für Stranggießanlagen und Walzen für kontinuierliche Verzinkungsanlagen in Stahlwerken aufgezeigt.
  • Publication
    Novel process chains for the production of plastics/metal-hybrids
    ( 2011)
    Reisgen, U.
    ;
    Chleser, M.
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    Scheik, S.
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    Michaeli, W.
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    Grönlund, O.
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    Neuß, A.
    ;
    Wunderle, J.
    ;
    Poprawe, R.
    ;
    Rösner, A.
    ;
    Bobzin, K.
    ;
    Schläfer, T.
    ;
    Theiß, S.
    ;
    Kutschmann, P.
    ;
    Haberstroh, E.
    ;
    Flock, D.
    ;
    Bührig-Polazcek, A.
    ;
    Jakob, M.
    The hybrid technology combines the advantages of the materials metals and plastics in one part. State of the art production technologies whether comprise of a high number of process steps or show limits regarding the feasible geometrical part complexity. Therefore, novel highly efficient process chains have been developed for the production of plastics/metal-hybrids. Beside the further development of different joining technologies the combination of injection molding of plastics and high pressure die casting of metals is being presented in this paper. Three different process chains are investigated targeting different plastics/metal-hybrid products and markets. For these process chains the necessary development of machine and mold technology is shown as well as the results of detailed process investigations combining different metals and plastics. New promising strategies have been found to achieve a direct bonding between plastics and metals without using chemical aids.
  • Publication
    Improving the reproducibility and the comparability of bond strength values
    ( 2008)
    Kopp, C.A.
    ;
    Bobzin, K.
    ;
    Ernst, F.
    ;
    Richardt, K.
    ;
    Schläfer, T.
    One of the most popular test methods for the evaluation of thermally sprayed coatings and substrate pre-treatment is the bond strength test in accordance to the standard EN 582 (in Europe) or ASTM C633-79 (in the U.S.). An interlaboratory test, carried out in 2003, has shown that bond strength tests of samples that were joined by different institutions in accordance to DIN EN 582 lead to bond strength values that varied by the factor 2, even if the same adhesive was used. The test not only made clear that the adhesives used to join the loading block to the substrate block but also many other parameters have a tremendous influence on the results of the bond strength tests. It was also clarified that the DIN standard needs to be supplemented in order to improve the comparability and the reproducibility of the bond strength test results. The first aim of this work was to identify the influencing parameters by carrying out Failure Mode and Effect Analyses (FMEA) together with namable institutions. Based on these results, a work instruction based on the DIN standard will be composed in order to avoid its weak spots. Later, a second interlaboratory test will be carried out to evaluate the quality of the work instruction.