With no doubt, friction and its distribution during cold rolling process is of great importance. Knowing the friction forces, resulted from the pressure distribution in the roll gap, can be used to control the most important rolling parameters such as load, torque, power, efficiency etc. Besides, the rolls' life and products' quality are also affected by the amount of coefficient of friction (COF). In this investigation, many rolling passes were performed on real industrial steel mills. Then, the friction-hills curves were plotted using MATROLL software. The friction-hills diagrams plotted based on the obtaining COFs show some kind of abnormalities when the COF values are too low. Finally, the minimum values of COF, that do not show the expected homogeneity in curves, were determined for cold rolling of steel.
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