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How dry is dry? - A critical analysis of surface conditions used in dry metal forming

Wie trocken ist trocken? Eine kritische Analyse von Oberflächenzuständen beim Trockenumformen
 
: Almohallami, Amer; Arghavani, Mostafa; Böhmermann, Florian; Freiße, Hannes; Herrmann, Marius; Mousavi, Ali; Schöler, Simon; Scholz, Peter; Tenner, Jennifer; Teller, Marco; Wulff, Daniel; Yilkiran, Deniz; Maier, Hans-Jürgen; Umlauf, Georg

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Volltext urn:nbn:de:0011-n-4525134 (185 KByte PDF)
MD5 Fingerprint: 25a83dd39b1919ab8b7437ace4933e3f
Erstellt am: 20.6.2017


Dry metal forming open access journal 3 (2017), S.090-094
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWU ()
cleaning; coating; lubricant; spectroscopy; surface analysis; Trockenziehen; schmiermittelfrei; Schmiermittel; Beschichtung; Reinigung; Oberflächenanalyse; Spektroskopie

Abstract
In the present study, the surface conditions of workpieces used for dry-metal forming experiments were analyzed. Specifically, the effectiveness of different cleaning approaches was evaluated using x-ray photoelectron spectroscopy, infrared spectroscopy and wetting experiments. The best cleaning results were obtained using a CO2-based approach. CO2 acts as an effective solvent and as a result of the mechanical impact, it removes material from the surface. In fact, cleaning results were similar to those achieved by plasma cleaning. However, even simple cleaning with a towel and acetone left only a surface film of less than 100 nm. A residual oil film thickness below 100 nm on the work piece appears sufficient to mimic true dry-forming conditions in most cases. In order to determine cleanliness of surfaces used in dry-metal forming, an infrared spectroscopy-based oil film gauge along with a customized extended calibration curve turned out to provide for sufficiently accurate data.

: http://publica.fraunhofer.de/dokumente/N-452513.html