Обеспечение устойчивого процесса поштучной формовки специальных гнутых профилей

Abstract

In the case of single-piece production of special asymmetric profiles on roll forming mills, their helical twisting, longitudinal bending, and changing the main dimensions of the section along the length are possible. A number of known schemes and methods of forming in rolls of roll forming mills aimed at preventing and eliminating these defects. The most widely used are methods for balancing the bending moments necessary for folding shelves. However, they provide positive results only with a continuous profiling process. When the piece process, which at the beginning and end of the molding of each workpiece is unstable, their use does not guarantee the absence of these defects. In addition, there is a transverse displacement of the profiles in the calibers of the rolls, at the entrance to them and in the vertical rollers between the stands. To ensure a stable molding process, to prevent longitudinal bending and twisting of the profiles and their lateral displacement in the gauge, it is necessary to simultaneously start contact with the rolls of at least two sections of the front end of the profile located on different sides from the center of gravity of its cross section. It is advisable to provide such contact with the horizontal rolls of the working stands at the edges.