Abstract
Rolling tests are carried out to confirm if Orowan theory is applicable to hot rolling of aluminum. In some cases using lubricant, sliding friction with low friction coefficients occurs, on the other hand in cases without lubricant sticking friction occurs. On the whole, mixed sliding and sticking friction is dominant in hot rolling of aluminum. For the prediction of rolling force, precise estimation of rolling temperature is necessary, because temperature fall during rolling is over 100°C in some cases. Moreover, precise estimation of mean flow stress is also necessary, because it has variation over 10% even for the same materials according to the small deviation of chemical composition or heating condition in the soaking furnace etc. By considering the above, the calculated rolling force and forward slip agree well with the experimental ones with sufficient accuracy.
