Characterization of an Environmentally Friendly Tribological System for Deep Drawing Using Volatile Media as Lubricant Substitute

Abstract:

Commonly used lubricants in sheet metal forming usually base on mineral or synthetic oils, water based emulsions, drawing films or hotmelts (waxes). However, these conventional lubricants often contain harmful substances to human health and the environment. For this reason, a novel tribological system for dry metal forming has been developed. Basic principle of this new tribological system comprises the use of volatile media such as CO_{2 (liquid)} and N_{2 (gaseous)}, which are injected into the contact interface under high pressure via injectors integrated into the tool. The volatile media used, lead to a significant reduction in friction and ensure robust friction behavior in deep-drawing processes. The investigations reported about in this contribution particularly focus on the friction behavior occurring in this tribological system at highly loaded radii. The friction investigations were carried out by using a modified stretch-bending-test and showed the effects of the main process-influencing parameters. In the present paper, these results are compared to already published results of the friction behavior investigated by means of flat strip drawing investigations. The findings obtained in this way allow a better understanding and prediction of the tribological system´s properties, thus making it usable for sheet metal forming applications.

• Periodical: Defect and Diffusion Forum (Volume 414)
• Pages: 75-80
• DOI: https://doi.org/10.4028/p-65utsh
• Online since: February 2022
• Authors: Gerd Reichardt*, Mathias Liewald
• Keywords: Deep Drawing, Dry Metal Forming, Stretch-Bending-Test

References

[1] M. Henn, G. Reichardt, R. Weber, T. Graf, and M. Liewald, Advances in Dry Metal Forming Using Volatile Lubricants Injected Through Laser-Drilled Microholes,, in TMS 2020 - Supplemental Proceedings, 2020, p.1979–(1991).

DOI: 10.1007/978-3-030-36296-6_182

[2] M. Singer, M. Liewald, and A. Feuer, Development of a new ecological lubrication system for sheet metal forming based on CO2 in liquid, vol. 651–653. (2015).

DOI: 10.4028/www.scientific.net/kem.651-653.480

[3] C. Wörz, E. Zahedi, G. Umlauf, M. Liewald, R. Weber, and G. E. M. Tovar, Tiefziehen eines U-Profils mit flüchtigen Medien als Schmierstoffersatz,, Dry Met. Form. OAJ FMT 3, vol. 3, (2017).

[4] G. Reichardt, C. Woerz, and M. Liewald, Investigation of the Friction Conditions Occurring During Dry Deep Drawing Using Volatile Media as Lubrication Substitution,, in WGP 2018, Advances in Production Research, 2018, p.750–762.

DOI: 10.1007/978-3-030-03451-1_72

[5] G. Reichardt and M. Liewald, Investigation on friction behaviour of deep drawing radii using volatile media as lubricant substitutes,, in Procedia Manufacturing, SheMet 2019, 2019, vol. 29, p.193–200.

DOI: 10.1016/j.promfg.2019.02.126

[6] A. Papaioanu, Einsatz eines neuartigen Verfahrens zum kombinierten Recken und Tiefziehen von Außenhauptbeplankungen aus Feinblech,, University of Stuttgart, (2016).