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Tribological system for cold sheet metal forming based on volatile lubricants and laser structured surfaces

Reichardt, Gerd; Wörz, Christoph; Singer, Markus; Liewald, Mathias; Henn, Manuel; Förster, Daniel J.; Zahedi, Ehsan; Boley, Steffen; Feuer, Anne; Onuseit, Volkher; Umlauf, Georg; Reichle, Paul; Barz, Jakob Philipp; Tovar, Günter; Hirth, Thomas

Abstract:
A novel tribological system has been developed, in which volatile lubricants (carbon dioxide - CO$_{2}$ or nitrogen- N$_{2}$) are used as a substitute for mineral oil-based lubricants in deep drawing processes. This process enables the introduction of an intermediate medium under high pressure through flow-optimized, laser-drilled micro holes into the contact surfaces. This eliminates the need for subsequent, cost-intensive cleaning processes, as the volatile lubricants evaporate without leaving any residue during expansion to ambient pressure.
The design of initial micro hole geometries was based on simulations of the flow behaviour of the lubricants passing through, which in turn were validated using pressure reactor tests. In addition, the wetting behaviour of CO$_{2}$ on relevant surfaces (tool surface and sheet material surface) was investigated experimentally using the captive-bubble-method. Thus, the optimal design of the micro holes (diameter, hole geometry and number of micro holes) could be determined using flat strip drawing tests. The optimal micro hole geometry determined in this way is suited for the use of both CO$_{2}$ and N$_{2}$ as volatile lubricant. ... mehr

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Originalveröffentlichung
DOI: 10.26092/elib/156
Zugehörige Institution(en) am KIT Karlsruher Institut für Technologie (KIT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 12.06.2020
Sprache Englisch
Identifikator KITopen-ID: 1000122163
Erschienen in Dry metal forming open access journal
Band 6
Seiten 128-165
Schlagwörter Dry Metal Forming, Deep drawing, Ultrashort pulsed laser drilling, volatile Lubricant
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