Frictional characteristics of steel sheets used in automotive industry
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In this paper the results of experimental tests aimed to determine the friction coefficient in sheet metal forming operations for various sheet metal materials and at different operative conditions are presented. The research has considered the frictional characterization of three kinds of drawing quality steels that are commonly used in automotive industry. These are a drawing quality steel (DQ), a deep drawing quality steel (DDQ), and extra deep drawing quality steel (EDDQ). For measurement of the sheet surface topography, a 3D stylus instrument Alicona InfiniteFocus was used. To determine the friction coefficient three tribological tests, i.e. a strip drawing test, a draw bead test and a pin-on-disc tribometer, have been conducted. The experimental results have ascertained several relationships showing the effect of sheet metal surface roughness, lubricant conditions and sheet orientation on the value of friction coefficient in sheet metal forming processes. The results further showed that the surface topography and sample orientation in the rolling direction of the sheet are significant factors that influence the friction coefficient. It was found that the tested steel sheets, selected from automotive industry applications, exhibit anisotropic resistance to the friction corresponding to the measured orientation in relation to the rolling direction of the sheet.
Key WordsFriction Friction anisotropy Strip drawing test Coefficient of friction Draw-bead test Sheet metal forming
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- Antoszewski, B., Evin, E. and Audy, J. (2008). A study of the effect of type (Cu+Ti) and (Mo+Ti) electro-spark coatings on fricion in pin-on-disc testing. J. Tribol. 130, 2, 26–31.Google Scholar
- Green, D. E. (2001). An experimental technique to determine the behaviour of sheet metal in a drawbead. SAE Paper No. 2001-0-1136.Google Scholar
- Larrson, M. (2009). Computational characterization of drawbeads. A basic modelling method for data generation. J. Mater. Process Tech. 209, 1, 376–386.Google Scholar
- Nanayakkara, N. K. B. M. P. and Hodgson, P. D. (2006). Determination of drawbead contacts with variable bead penetration. Comp. Method. Mater. Sc. 6, 3–4, 188–194.Google Scholar
- Nanayakkara, N. K. B. M. P., Kelly, G. L. and Hodgson, P. D. (2004). Determination of the coefficient of friction in partially penetrated draw beads. Steel Grips, 2, 677–680.Google Scholar
- Pin-on-disc Tribometer (1999). Pin-on-disc Tribometer T-01M- Service Manual. Institute for Sustainable Technologies. Radom.Google Scholar
- Trzepieci ski, T. (2013). Analysis of the friction influence on change of surface topography in strip drawing test. Tribologia 44, 1, 125–134.Google Scholar
- Trzepieci ski, T. and Lemu, H. G. (2012). Application of genetic algorithms to optimize neural networks for selected tribological tests. J. Mech. Eng. Autom. 2, 1, 69–76.Google Scholar