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Lubricant-free deep drawing using CO2 and N2 as volatile media injected through laser-drilled microholes

: Zahedi, Ehsan; Woerz, Christoph; Reichardt, Gerd; Umlauf, Georg; Liewald, Mathias; Barz, Jakob; Weber, Rudolf; Graf, Thomas

Fulltext ()

Vollertsen, Frank (Hrsg.):
5th International Conference on New Forming Technology, ICNFT 2018 : Bremen, Germany, September 18-21, 2018
Les Ulis: EDP Sciences, 2018 (MATEC Web of Conferences 190)
Art. 14007, 10 pp.
International Conference on New Forming Technology (ICNFT) <5, 2018, Bremen>
Conference Paper, Electronic Publication
Fraunhofer IGB ()
Deep drawing; drilling; laser micro machining

Most metal forming processes use lubricants based on mineral oils as an intermediate medium to reduce friction and wear. To avoid the well-known drawbacks of oil lubrication, a novel and environment friendly lubrication system for deep-drawing processes was demonstrated at the University of Stuttgart. Liquid carbon dioxide and gaseous nitrogen are being used as volatile lubrication during the deep-drawing process, locally injected at high pressure through laser-drilled microholes. This new tribological system provides a significantly enlarged working range and at least 15% larger drawing depths compared to conventional oil lubrication