Analysis and quantitative consideration of inlet oil film thickness in cold sheet rolling with oil in water emulsions--an investigation of friction and lubrication in cold rolling VI--

摘要

Analysis of inlet oil film thickness in rolling is performed in order to clarify the lubrication behavior in cold sheet rolling with oil in water emulsion. The oil film thickness in the inlet zone of the contact region is calculated based on theReynolds equation considering the effect of temperature and pressure of viscosity of the lubricant by applying a starved model. The calculated inlet oil film thickness depends on parameters such as particle diameter in emulsion, emulsion concentration,and trapped ratio. For higher lubricant viscosity, the differences between inlet oil thickness for emulsion and neat oil become larger. In addition, the calculated values are compared with the inlet oil film thickness estimated by the surface grosses of sheets rolled with oil in water emulsions and with starved neat oils, and good agreements between them are obtained. Consequently, it is found that the inlet oil film thickness in cold sheet rolling with oil in water emulsion can be quantitativelycalculated using the proposed starved model.