Intermediate annealing is mainly to eliminate work hardening. The hot-rolled aluminum foil blank is rolled from 750μ to 15μ, the total processing rate has reached 98%, and the tensile strength has reached about 180MPa. In this way, during the rolling process of finished products, thinning is relatively difficult and slipping often occurs.
Another main task of intermediate annealing is to reduce pinholes in the finished product. Empirical data shows that when hot-rolled blanks are rolled into double-zero aluminum foil, rolling pinholes are doubled after intermediate annealing.
Roll management
Rolls are an important part of the rolling process, and stable roll quality is the basis for stable rolling. Main process
Therefore, intermediate annealing is generally arranged before the finished product pass to reduce the mechanical properties of the aluminum foil from 160~180MPa to 120~140MPa. Because the blank thickness selection is different, the total processing rate of four-pass production is slightly lower than that of five-pass rolling. In addition, the temperature of the deformation zone is high during four-pass production, which reduces the degree of work hardening of the aluminum foil. Therefore, the intermediate annealing temperature is higher than that of five-pass rolling. Slightly lower during first production.
