Development of Methodology for Calculating Parameters of Continuous Deformation of Pipe Billet at Production of Electric-Welded Pipes of Small and Medium Diameter

This article discusses the energy-power parameters of forming a pipe billet in the course of continuous molding. In addition, it expounds on the calibration of a roll tool for pipe Dt × St = 50 × 1.5 mm of strength class K52. First, the pipe billet’s deformation state and longitudinal deformation were determined, with the latter ranging from 0.18–0.26 %, which is considered a permissible value. Moreover, the contact surface of the pipe billet and the roll tool were estimated for gauge study. The effective diameters were then calculated for all driven forming rolls. Various options for the location of the effective diameters are described, which divide the contact surfaces into lead and lag zones. A method was then proposed for determining the lead and lag zones and the total pulling forces on the forming mill gauges. Depending on the location of the effective diameter for both upper and lower roll, pulling force distribution graphs were plotted. Finally, the schemes of distribution of energy-power parameters of the deformation process of a pipe billet were determined, which facilitated the rational selection of parameters for a specific pipe grade.