INFLUENCE OF ROLLING SPEED ON THE TEMPERATURE FIELD DURING COLD ROLLING OF ALUMINIUM SHEETS

One of the effects of plastic deformation is an increase in the temperature of the formed metal. Strip temperature is a critical control factor in the cold rolling process of aluminum sheets, as it affects the quality of the finished product (thickness distribution over the strip width) and the possibility of defects caused by the adhesion of the rolled metal to the surface of the rolls. The rolling pressure, friction stress, and contact state show different characteristics in different zones along the deformation zone, which causes the heat generation and transfer states to be different, so the strip temperature is subject to a complex change process. The paper presents the results of experimental temperature measurements at several points on the width of the rolled strip and on the surface of the working rolls depending on the rolling speed in the range of 0.5-4.0 m/s. The results obtained showed a clear dependence of both the strip temperature and the working roll temperature on the rolling speed, with the increase in strip temperature being more intense. At very high rolling speeds, the temperature of the rolled sheet may even exceed 100 degrees C, which is unfavourable due to the possibility of the formation of deposits on the surface of the rollers.