Abstract
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.
Highlights
In metal deep-drawing, usually mineral oil- or wax-based lubricants are used
A novel tribological system for sheet metal deep drawing that eliminates the use of conventional lubricants was developed at the University of Stuttgart
In order to understand the limits of this new tribological system, several deep drawing tests have been carried out and compared with a conventional deep drawing process using mineral oil- or wax-based lubricants
Summary
In metal deep-drawing, usually mineral oil- or wax-based lubricants are used. These lubricants may contain toxic additives, and the formed components have to be cleaned in subsequent process steps in a cost and time-consuming manner [1]. To avoid these issues, a novel tribological system for sheet metal deep drawing that eliminates the use of conventional lubricants was developed at the University of Stuttgart. The liquid gas that evaporates close before or in the contact zone between sheet metal and tool surface, serves as lubricant, and subsequently evaporates without residue
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