Abstract
A calculation system of the inlet oil film thickness in cold sheet rolling with oil droplets-in-water (O/W) emulsion was developed. The inlet oil film thicknesses in the case of sheet rolling and coil rolling were calculated using the estimation system. The inlet oil film thickness in the coil rolling was larger than in the sheet rolling. In order to estimate the inlet oil film thickness at the entrance to the interface between roll and workpiece in cold coil rolling with O/W emulsion, a numerical method was proposed using the starvation model. This model consisted of a combination of the conventional starvation model and the plate out model. The inlet oil film thicknesses were calculated, changing the tribological factors, using the numerical method of the new starvation model. By using the proposed numerical method, the inlet oil film thickness obtained experimentally using the estimation system could be reasonably estimated.
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