Irregularity in Friction Hills during the Cold Rolling of Materials

Among the cold rolling parameters, the pressure distribution or friction hill within the roll gap is one of the most significant one. Almost all of the previous works in this regard are based on laboratory simulations rather than industrial mill conditions though the situations can be completely different. In this study, following determination the coefficient of friction (COF), the friction hills for the real industrial mills were obtained by Matroll software. After carrying out various industrial cold-roll passes on 3003 aluminum alloy and low carbon steel, the friction hills were plotted for industrial cases. The new findings indicate that there are some kinds of irregularities in the real industrial friction hills that are different from those reported for laboratory cases. The results show that this happens when the COF values during industrial rolling are too low.