Abstract
Temperature of a bottom working roll of the first stand of a hot strip finishing mill during rolling was measured by means of thermocouples embedded in the surface layer of the roll. Instantaneous temperature change was detected and led to the recorder through slip rings. Maximum temperature rise measured was about 100 degrees C at about 1 mm from surface. Characteristics of periodical change in temperature in various zones in the roll were examined. In the zone II, 0.5 to 5mm from surface, temperature depended solely on the angle of rotation. In the zone II, 0.5 to 5mm from surface, temperature depended both on angle of rotation and on the number of rotations during one rolling. In the zone III, 5 to 30mm from it, temperature depended both on number of rotations and on the number of rollings. In the zone IV, 30mm to center, temperature depended solely on the number of rollings. Temperature at center approached a constant value after about 30 rollings. Dependence of temperature rise on rolling variables was examined. Amount of cooling water was found the most critical in determining the temperature in the roll and the reduction rate of plate was the second most so, while the interval of rolling was even less critical.
