| Autor: |
Singer, Markus, Liewald, Mathias |
| Zdroj: |
Applied Mechanics and Materials; October 2015, Vol. 794 Issue: 1 p53-58, 6p |
| Abstrakt: |
Lubricants in sheet metal forming have to meet increasing demands resulting from political aims and ecological requirements. For that reason, industry aspires the reduction of lubrication with the long term goal of replacing conventional mineral oil based lubricants entirely. Dry metal forming to a certain limit can be achieved by using liquid CO2 during the forming process. This lubricant vaporizes after deep drawing process and leaves a clean work piece that can be used in coating or joining processes without any subsequent cleaning. In this contribution, further development and resulting effects of numerous process parameters are evaluated and presented. Investigations of restraining forces in strip draw tests when lubricated with liquid CO2 include different tool parameters like drilling diameters (120 and 140 µm), different numbers of drillings (25 and 49) as well as different process parameters like surface pressure (2,5 and 6,5 MPa) or drawing speed (50 and 100 mm/s). Amount of restraining forces in this paper also are compared to two different conventional mineral oil based lubricants (Wisura AK 3080 and Wisura ZO 3368). The results presented in this contribution may provide a better understanding of tribological mechanisms emerging within this new lubrication system. |
| Databáze: |
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