Zahedi, EhsanEhsanZahediWoerz, ChristophChristophWoerzReichardt, GerdGerdReichardtUmlauf, GeorgGeorgUmlaufLiewald, MathiasMathiasLiewaldBarz, JakobJakobBarzWeber, RudolfRudolfWeberGraf, ThomasThomasGraf2022-03-142022-03-142018https://publica.fraunhofer.de/handle/publica/40248010.1051/matecconf/201819014007Most 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 lubricationenDeep drawingdrillinglaser micro machining660610620conference paper