Анализ возможности производства профилей переменного сечения формовкой в валках

Abstract

In a number of branches of the Ukrainian economy, profiles of variable cross-section type of channels, manufactured by sheet punching, are widely used. Their main advantage is the possibility of obtaining equally strong structures with reference to specific operating conditions at the lowest metal consumption. The most promising way of obtaining profiles of variable cross-section is represented by profiling in the rolls of the roll forming mill. It is established that after the angle of the bend reaches 90°, the time interval for forming a section of variable width increases sharply. This leads to an increase in clearance in the caliber of the rolls, in which it is not possible to mold the bending point in a section of variable width. A dependence providing the calculation of the simultaneous displacement of the moving elements of the upper and lower rolls is obtained, which is provided by individual drives of the mechanism of displacement of each of them. The obtained analytical dependencies can be used as initial ones in the development of technological methods aimed at minimizing the unevenness of deformations along the section of the profile ("softening" the molding regime, creating additional longitudinal deformations at bending points) and, ultimately, improving the quality of the finished profiles variable section.