Effect of friction conditions on change of sheet surface roughness during deep drawing

The article deals with problems related to analysis of friction existed in sheet metal forming. In order to determine the influence of surface parameter value of the sheets, surface parameters of the rollers and pressure force on friction coefficient value the strip-drawing friction tests have been performed. Furthermore, the analysis of the effect of friction conditions on the change of sheet roughness parameters has been done. The topographical analysis of tested samples was carried out by using the measurement system Alicona InfiniteFocus. As the testing materials low-carbon deep drawing quality steel sheet has been used. In case of rolls with surface roughness parameter value of Ra = 0.63 and 1.25 mm the smoothing of peaks roughness during the friction process was observed. For the roll with surface roughness value of Ra = 2.5 mm the highest deviation of the surface after friction tests in respect of the reference surface exists below the reference surface. In all analyzed frictional conditions the decreasing of the value of the surface roughness parameters Ssk and Sku characterizing the topography of the sheets was noticed. During tests realized in dry friction conditions the value of surface roughness parameter Ssk was smaller than for lubrication conditions. In case of Sku parameter the reverse dependence was observed.

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