INFLUENCE OF HYDRODYNAMIC LUBRICANT ENTRAINMENT ON FRICTION EFFECTS IN COLD-ROLLING

The cold rolling process is decisively influenced by the mechanisms of lubricant supply to the deformation zone. Rolling tests with thin alu minium sheets were performed based on a theoretical model of the hydro dynamic entrainment of lubricant. Aluminium was used as a model materi al for steel in order to get a soft rolling stock to enlarge the hydro dynamic effect. The rolling conditions were chosen so that changes in friction conditions could definitely be traced back to a hydrodynamic effect in the inlet zone. The changes in friction conditions were demo nstrated by significant rolling parameters, dimensionless similarity n umbers, and alterations of the surface structures of the rolled test s heets. The conclusions indicate some tribological problems in cold rol ling.