Physical Modeling of the Steel Sheet Topography in Skin Pass Rolling and Its Influence on Susceptibility of Sheets to Deep Drawing

Abstract

This work is focused on the formation of sheet surface topography and its influence on drawability of sheets. 3D roughness measurements is used to study surface topography and cupping tests by Erichsen and by Swiftto establish and to compare drawability of steel sheets with and without surface treatment. In addition, statistical analysis is presented to determine parameters characterizing the surface topography which has a decisive influence on the susceptibility to sheet-metal forming. The research shows that a change in surface topography in steel sheets with high plasticity (grades DC03, DC04, and DC05) does not significantly affect their drawability measured in Erichsen test, but it can significantly affect the susceptibility of sheets to deep drawing. In case of stainless steel X6Cr17, a clear impact of surface topography on the technological properties is ascertained both the Erichsen's value and the limit drawing ratio depend strongly on the type of abrasive used for vapor blasting.

Evolution on Topography of Textured Work Rolls and Steel Strips during Cold Rolling and Temper Rolling

“…The surface topography of steel strips is transferred from textured work rolls in the last stand of tandem cold rolling and temper rolling, both of which is an attenuation rolling‐transfer process . It has significant effects on high‐quality automobile sheet and home appliance plate in terms of distinctness of image, stamping performance, and binding force between paint and substrate after roller coating or spraying . With an increasing demand for premium automobile and high‐end home appliance, surface quality has become one of the most important indexes to assess the cold rolled steel sheets .…”

“…It has significant effects on high‐quality automobile sheet and home appliance plate in terms of distinctness of image, stamping performance, and binding force between paint and substrate after roller coating or spraying . With an increasing demand for premium automobile and high‐end home appliance, surface quality has become one of the most important indexes to assess the cold rolled steel sheets . During the industrial production process of steel strips, rolling process parameters are generally set and controlled by the computer, according to the strip profile and flatness, work piece materials, and mechanical properties .…”