Тhe method for calculating the parameters of the lever system adjustment for cold rolling mills

Stand drives of cold rolling mils which use a lever system, have been farther developed recently. In particular, such stand structures for rolling steel are also used for rolling pipes of large diameter at the cold rolling mills. On the assumption of pipes deformation characteristics the correct choice of rolling radius is a very important issue which has an influence on the process. It should be noted that the mills of this design are set up to the rolling diameter not only by the choice of a roller journal (or diameters of driving pinions in roll mills), but also by the change in settings of the lever system. Meanwhile, there are a lot of questions that still can`t be answered. Thus theoretical issues concerning this problem is considered to be of high importance now. The article describes the main currently existing dependencies which allow to calculate the correct parameters of lever-type system adjustment at cold pilger rolling mills in order to choose the rolling and the radius of roller journals for cold pilger rolling pipes rolling. In this article the influence of the cold rolling mills lever-type system on the change of rolling radius along the deformation cone is analyzed. The relationship between the rolling radius and the lever arm of the system are deducted. The analysis of the theoretical research results shows that it is possible to get the required change of the rolling radius value along the deformation cone by the cold rolling mills lever system adjustment. This issue is essential for cold pilger rolling mills with the appropriate design of a drive The change of pipe diameter is very large. That`s why the necessary change in rolling of cold rolling mills can cause a lot of problems and even make the rolling process impossible. It should be stressed that the required change of the rolling radius along the deformation cone can be the adjustments of the lever-type system at cold pilger rolling mills. The calculation results are checked during the cold pilger rolling mills adjustment practice in the modern pipe rolling shop for the rolling of commercial number of tubes. The method described above permits to create the most favorable conditions for deformation the deformation cone at cold pilger rolling mills.