Cold rolling is one of the major metal forming processes used in industry. Surface properties play an important role in the quality of products used and controlling the rolling parameters in order to maintain preferable quality of surface is important. The lubrication is essential in this regard. The regime of lubrication is often mixed-film where strips and rolls have asperity contact because of high pressure between the two contacting surfaces. This contact is favorable for quality of trip surface. The surface characteristic of product depends directly on the value of contact ratio between roll and sheet. In this study a model is presented to describe strip rolling lubricated with oil in water . (O/W) emulsion. In the present research, the plastic flattening of asperities during the process in mixed regime of lubrication is taken into account. The Reynolds equation is solved for emulsion and slab method is implemented to take the bulk plastic deformation of strip into consideration. This study confirms higher film thickness and lower contact ratio for higher oil content of emulsion. Furthermore, results show higher dependence of asperity contact and film thickness on oil percentage of emulsion in high speeds.
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