Generally, the upper and lower work rolls are arranged in a staggered manner. There are multiple sets of backup rolls arranged in a star chessboard under the lower row of work rolls to support the work rolls. During the leveling process of thin high-strength steel plates, the backup rolls can be 100% straightened. The leveling principle For the Bauschinger effect, the positive and negative deformation of the steel plate is leveled, and the working principle is similar.
The principle of the roller leveler:
The size and direction of the original bending curvature of the metal are different. The roller straightener makes the metal repeatedly bend for many times to eliminate the unevenness of the curvature, so that the curvature changes from large to small to make it straight.
In the roller leveler, according to the difference in the amount of deformation (reduction) of the metal produced by each roller, there are two proposed correction schemes: a small deformation correction scheme and a large deformation correction scheme.
Small deformation correction scheme: The so-called small deformation correction scheme assumes that each roll of the upper row of work rolls of the leveler can be adjusted individually, and the adjustment principle of the reduction of each roll is: the metal entering the roll is reversed and bent. After rebound, its maximum original curvature should be completely eliminated, that is, the part should be straightened.
Large deformation correction scheme: Due to the change of the original curvature of the straightened metal and the difficulty of accurately determining it, a large deformation correction scheme is often used in production.
